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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Limpopo Belt (1)
-
North Africa
-
Algeria
-
Great Kabylia (1)
-
-
Maghreb (1)
-
Morocco
-
Tafilalt (1)
-
-
Tunisia (1)
-
-
Southern Africa
-
Karoo Basin (1)
-
Namibia
-
Kaoko Belt (1)
-
-
South Africa
-
Eastern Cape Province South Africa (1)
-
-
Zimbabwe (1)
-
-
Zimbabwe Craton (1)
-
-
Antarctica
-
Antarctic Peninsula (1)
-
Transantarctic Mountains (1)
-
Victoria Land (1)
-
-
Asia
-
Arabian Peninsula
-
Saudi Arabia
-
Ghawar Field (1)
-
-
United Arab Emirates
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Abu Dhabi (1)
-
-
-
Far East
-
China
-
Gansu China (1)
-
Guangxi China (1)
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North China Plain (1)
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Qinghai China (1)
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South China Block (1)
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Xizang China (1)
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Indonesia
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Celebes (1)
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Korea (1)
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Mongolia (1)
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Sino-Korean Platform (1)
-
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Himalayas (1)
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Indian Peninsula
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India (1)
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Nepal (1)
-
-
Middle East
-
Cyprus
-
Troodos Massif (1)
-
-
-
Tibetan Plateau (3)
-
-
Atlantic Ocean
-
North Atlantic
-
Gulf of Mexico
-
De Soto Canyon (1)
-
-
North Sea
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Kattegat (1)
-
-
-
-
Atlantic Ocean Islands
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Canary Islands
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Tenerife (1)
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-
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Australasia
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Australia
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Adelaide Geosyncline (1)
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Amadeus Basin (1)
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South Australia (1)
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Tasmania Australia (1)
-
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New Zealand
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Hawke's Bay New Zealand (1)
-
-
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Avalon Zone (1)
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Black Mesa (1)
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Caledonides (2)
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Canada
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Arctic Archipelago (1)
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Eastern Canada
-
Gander Zone (1)
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Newfoundland and Labrador
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Labrador (1)
-
Newfoundland (2)
-
-
Ontario
-
Cochrane District Ontario
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Timmins Ontario (1)
-
-
Timiskaming District Ontario
-
Kirkland Lake Ontario (1)
-
-
-
Quebec
-
Sherbrooke County Quebec (1)
-
-
-
Nunavut
-
Ellesmere Island (2)
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Sverdrup Basin (1)
-
-
Queen Elizabeth Islands
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Ellesmere Island (2)
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Sverdrup Basin (1)
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-
Western Canada
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Alberta (1)
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British Columbia
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Bowser Basin (1)
-
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Canadian Cordillera (1)
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Canadian Rocky Mountains (1)
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Manitoba (2)
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Northwest Territories (2)
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Saskatchewan (1)
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Yukon Territory (1)
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-
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Canterbury Basin (1)
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Caribbean region (1)
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Cascade Range (1)
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Central Cordillera (1)
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Dunnage Zone (1)
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Essaouira Basin (1)
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Eurasia (1)
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Europe
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Alps
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Central Alps
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Lepontine Alps (1)
-
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Piedmont Alps
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Dora Maira Massif (1)
-
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Swiss Alps
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Central Swiss Alps (1)
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Western Alps
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Cottian Alps
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Dora Maira Massif (1)
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Dauphine Alps
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Pelvoux Massif (1)
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Ligurian Alps (1)
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Mont Blanc (1)
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Savoy Alps (1)
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Brianconnais Zone (1)
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Central Europe
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Poland
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Swiety Krzyz Mountains (1)
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Switzerland
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Graubunden Switzerland (1)
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Swiss Alps
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Central Swiss Alps (1)
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Swiss Jura Mountains (1)
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Ticino Switzerland
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San Giorgio Mountain (1)
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Jura Mountains
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Swiss Jura Mountains (1)
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Pannonian Basin (1)
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Pyrenees (2)
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Southern Europe
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Iberian Peninsula
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Spain
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Basque Provinces Spain
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Vizcaya Spain
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Bilbao Spain (1)
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-
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Cantabrian Basin (1)
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Catalonia Spain (1)
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Ebro Basin (1)
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Iberian Mountains (1)
-
-
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Italy
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Liguria Italy
-
Ligurian Alps (1)
-
-
Piemonte Italy
-
Dora Maira Massif (1)
-
-
-
-
Western Europe
-
Cottian Alps
-
Dora Maira Massif (1)
-
-
France
-
Ardeche France (1)
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Central Massif (1)
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Dauphine Alps
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Pelvoux Massif (1)
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Finistere France
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Crozon Peninsula (1)
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Haute-Savoie France
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Savoy Alps (1)
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Lorraine (1)
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Moselle France (1)
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Paris Basin (2)
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Pas-de-Calais France
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Boulonnais (1)
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Provence (1)
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Pyrenees-Orientales France
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Agly Massif (1)
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Vocontian Trough (1)
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Ireland
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Mayo Ireland (1)
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Scandinavia
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Denmark (1)
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Norway (3)
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Sulitjelma (1)
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Sweden (1)
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Western Gneiss region (1)
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United Kingdom
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Great Britain
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England
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Cornubian Batholith (1)
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South-West England (1)
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-
Scotland
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Great Glen Fault (1)
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Scottish Highlands
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Grampian Highlands (1)
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-
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-
-
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Green Mountains (1)
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Indian Ocean
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Arabian Sea
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Persian Gulf (1)
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Wombat Plateau (1)
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Llanos (1)
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Mediterranean Sea
-
East Mediterranean
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Black Sea (1)
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-
-
Mexico (1)
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North America
-
Appalachians
-
Central Appalachians (1)
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Northern Appalachians (3)
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Southern Appalachians (2)
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Valley and Ridge Province (1)
-
-
Basin and Range Province (2)
-
Canadian Shield
-
Nain Province (1)
-
Slave Province (1)
-
Superior Province
-
Abitibi Belt (1)
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Wabigoon Belt (1)
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-
-
Gulf Coastal Plain (2)
-
North American Cordillera
-
Canadian Cordillera (1)
-
-
Rocky Mountains
-
Canadian Rocky Mountains (1)
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U. S. Rocky Mountains (2)
-
-
Saint Lawrence Lowlands (2)
-
Slide Mountain Terrane (1)
-
Western Canada Sedimentary Basin (1)
-
Western Interior
-
Western Interior Seaway (1)
-
-
Yukon-Tanana Terrane (1)
-
-
North Island (1)
-
Pacific Ocean
-
South Pacific
-
Southwest Pacific
-
Hikurangi Trough (1)
-
-
-
West Pacific
-
Southwest Pacific
-
Hikurangi Trough (1)
-
-
-
-
Roberts Mountains (1)
-
San Juan Islands (1)
-
South America
-
Andes
-
Argentine Andes (1)
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Central Andes (2)
-
Eastern Cordillera (2)
-
Northern Andes (1)
-
-
Argentina
-
Argentine Andes (1)
-
Jujuy Argentina (1)
-
Pampean Mountains (1)
-
Salta Argentina (2)
-
-
Brazil
-
Borborema Province (1)
-
Brazilian Shield (1)
-
Sao Francisco Craton (1)
-
-
Colombia
-
Magdalena Valley (1)
-
-
Paraguay (1)
-
Parana Basin (1)
-
-
South Island (1)
-
Southern Uplands (1)
-
United States
-
Alabama (2)
-
Alaska (1)
-
Arizona (2)
-
Arkansas
-
Benton County Arkansas (1)
-
Boone County Arkansas (1)
-
Madison County Arkansas (1)
-
-
Atlantic Coastal Plain (1)
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Black Warrior Basin (1)
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Book Cliffs (1)
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Colorado
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Bent County Colorado (1)
-
Pueblo County Colorado
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Pueblo Colorado (1)
-
-
-
Colorado Plateau (1)
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Connecticut Valley (1)
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Georgia (1)
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Indiana
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Perry County Indiana (1)
-
-
Kansas
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Chase County Kansas (1)
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Shawnee County Kansas (1)
-
-
Kentucky (1)
-
Merrimack Synclinorium (1)
-
Midcontinent (2)
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Mississippi (1)
-
Missouri
-
Stone County Missouri (1)
-
-
Nevada
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Eureka County Nevada (1)
-
Humboldt County Nevada
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Santa Rosa Range (1)
-
-
-
New England (1)
-
New Mexico
-
Picuris Range (2)
-
-
New York
-
Ulster County New York (1)
-
-
North Dakota
-
Bowman County North Dakota (1)
-
Slope County North Dakota (1)
-
-
Ohio
-
Hamilton County Ohio
-
Cincinnati Ohio (1)
-
-
-
Oklahoma (1)
-
Ouachita Belt (1)
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Ozark Mountains (1)
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Southwestern U.S. (1)
-
Tennessee
-
Grainger County Tennessee (1)
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-
Texas
-
Dallas County Texas (1)
-
-
U. S. Rocky Mountains (2)
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Utah
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Grand County Utah (1)
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Millard County Utah (1)
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-
Vermont (1)
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Virginia (1)
-
Washington
-
Chelan County Washington (1)
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Okanogan County Washington (1)
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San Juan County Washington (1)
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Skagit County Washington (1)
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Whatcom County Washington (1)
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-
Wyoming (1)
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-
-
commodities
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anhydrite deposits (1)
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mineral deposits, genesis (1)
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mineral exploration (1)
-
oil and gas fields (1)
-
petroleum (3)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (5)
-
C-14 (1)
-
-
hydrogen
-
D/H (1)
-
-
isotope ratios (12)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (1)
-
C-14 (1)
-
Rb-87/Sr-86 (1)
-
Sm-147/Nd-144 (1)
-
U-238/Pb-206 (1)
-
-
stable isotopes
-
Ar-40/Ar-39 (1)
-
C-13/C-12 (5)
-
D/H (1)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (2)
-
Os-188/Os-187 (1)
-
Rb-87/Sr-86 (1)
-
S-34/S-32 (1)
-
Sm-147/Nd-144 (1)
-
Sr-87/Sr-86 (3)
-
U-238/Pb-206 (1)
-
-
-
large-ion lithophile elements (1)
-
Lu/Hf (2)
-
metals
-
actinides
-
uranium
-
U-238/Pb-206 (1)
-
-
-
alkali metals
-
rubidium
-
Rb-87/Sr-86 (1)
-
-
-
alkaline earth metals
-
strontium
-
Rb-87/Sr-86 (1)
-
Sr-87/Sr-86 (3)
-
-
-
lead
-
U-238/Pb-206 (1)
-
-
platinum group
-
osmium
-
Os-188/Os-187 (1)
-
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
Sm-147/Nd-144 (1)
-
-
samarium
-
Sm-147/Nd-144 (1)
-
-
yttrium (1)
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-
rhenium (1)
-
-
noble gases
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argon
-
Ar-40/Ar-39 (1)
-
-
-
oxygen
-
O-18/O-16 (2)
-
-
sulfur
-
S-34/S-32 (1)
-
-
-
fossils
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burrows (1)
-
Chordata
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Vertebrata
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Pisces
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Osteichthyes
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Actinopterygii
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Teleostei (1)
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Tetrapoda
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Mammalia
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Theria
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Eutheria
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Carnivora
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Pinnipedia (1)
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Perissodactyla (1)
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Reptilia
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Diapsida
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Archosauria
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dinosaurs (1)
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Sauropterygia (1)
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-
-
-
-
-
Graptolithina (3)
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Invertebrata
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Arthropoda
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Mandibulata
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Crustacea
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Ostracoda
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Podocopida
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Cavellinidae (1)
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Cytherocopina
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Cytheracea
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Cyprideis (1)
-
-
-
-
-
-
-
Trilobitomorpha
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Trilobita
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Phacopida (1)
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-
-
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Brachiopoda
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Articulata
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Orthida (1)
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Rhynchonellida (1)
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Terebratulida (1)
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Thecideidina
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Thecideidae (1)
-
-
-
-
Bryozoa
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Trepostomata (1)
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-
Cnidaria
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Anthozoa
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Zoantharia
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Tabulata (1)
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Hydrozoa (1)
-
-
Echinodermata
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Crinozoa
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Blastoidea (1)
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Crinoidea (4)
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Cystoidea (1)
-
-
Echinozoa
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Echinoidea (2)
-
-
-
Mollusca
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Bivalvia
-
Ostreoidea
-
Gryphaea (1)
-
-
-
Cephalopoda
-
Ammonoidea
-
Ammonites (1)
-
Ceratitida
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Ceratites (1)
-
-
Goniatitida
-
Goniatitidae
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Goniatites (1)
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-
-
-
-
Gastropoda
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Turritellidae (1)
-
-
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Porifera
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Hexactinellida (1)
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Stromatoporoidea (1)
-
-
Protista
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Foraminifera
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Fusulinina (1)
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Rotaliina
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Globigerinacea
-
Globorotaliidae
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Globorotalia
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Globorotalia inflata (1)
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-
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Rotalipora (2)
-
-
-
-
Radiolaria (3)
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Thecamoeba (1)
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-
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Metazoa (1)
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microfossils
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Chitinozoa (2)
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Conodonta
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Gnathodus (1)
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Fusulinina (1)
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-
palynomorphs
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acritarchs (1)
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Chitinozoa (2)
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miospores
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pollen (1)
-
-
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Plantae
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algae
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Coccolithophoraceae (2)
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diatoms (1)
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nannofossils (1)
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-
-
-
geochronology methods
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Ar/Ar (7)
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fission-track dating (5)
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K/Ar (1)
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Lu/Hf (2)
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paleomagnetism (1)
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Pb/Th (1)
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Rb/Sr (1)
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Re/Os (1)
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Sm/Nd (2)
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thermochronology (5)
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U/Pb (14)
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U/Th/Pb (4)
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geologic age
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Cenozoic
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Quaternary
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Holocene (3)
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Pleistocene
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Champlain Sea (1)
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upper Pleistocene (1)
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upper Quaternary
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Brunhes Chron (1)
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-
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Tertiary
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Neogene
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Miocene
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middle Miocene (4)
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upper Miocene
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Messinian (1)
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-
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Pliocene (4)
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Paleogene
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Eocene (7)
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Oligocene
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lower Oligocene (1)
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-
Paleocene
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lower Paleocene
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Danian (1)
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K-T boundary (4)
-
-
upper Paleocene (1)
-
-
-
-
-
Dalradian (1)
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Mesozoic
-
Cretaceous
-
Lower Cretaceous
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Albian (1)
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Aptian
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lower Aptian (1)
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-
-
Middle Cretaceous (2)
-
Upper Cretaceous
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Campanian (1)
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Castlegate Sandstone (1)
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Cenomanian (3)
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Hell Creek Formation (1)
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K-T boundary (4)
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Maestrichtian (2)
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Senonian (3)
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Turonian (1)
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-
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Jurassic
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Lower Jurassic
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Domerian (1)
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Hettangian (1)
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lower Liassic (1)
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middle Liassic (1)
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upper Liassic (1)
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Middle Jurassic (1)
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Upper Jurassic
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Arab Formation (2)
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Entrada Sandstone (1)
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Triassic
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Lower Triassic
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Permian-Triassic boundary (2)
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Middle Triassic
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Anisian (1)
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Doig Formation (2)
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Muschelkalk (1)
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Montney Formation (2)
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-
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Paleozoic
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Acatlan Complex (1)
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Cambrian
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Upper Cambrian (2)
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Carboniferous
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Hale Formation (1)
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Middle Carboniferous (1)
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Mississippian
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Boone Formation (1)
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Lower Mississippian
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Osagian (2)
-
-
Middle Mississippian
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Visean (1)
-
-
Upper Mississippian
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Chesterian (1)
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Meramecian (2)
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Serpukhovian (1)
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-
-
Pennsylvanian
-
Lower Pennsylvanian
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Morrowan (1)
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-
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Upper Carboniferous (1)
-
-
Devonian
-
Lower Devonian (5)
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Middle Devonian
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Detroit River Group (1)
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Givetian (2)
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Onondaga Limestone (1)
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Upper Devonian
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Frasnian (1)
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Hanson Creek Formation (1)
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Helderberg Group (1)
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lower Paleozoic (2)
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Ordovician
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Lower Ordovician
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Middle Ordovician (3)
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Maysvillian (1)
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Edenian (1)
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Kope Formation (3)
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Trentonian (1)
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Vinini Formation (1)
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Permian
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Americus Limestone Member (1)
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Ecca Group (1)
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Lower Permian (2)
-
Upper Permian
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Lopingian
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Changhsingian (1)
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Permian-Triassic boundary (2)
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-
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Silurian
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Lower Silurian
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Llandovery (2)
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Precambrian
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Archean (4)
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upper Precambrian
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Neoproterozoic
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Moinian (1)
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Sturtian (1)
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Vendian (1)
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Paleoproterozoic (1)
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Tapley Hill Formation (1)
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-
igneous rocks
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igneous rocks
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kimberlite (1)
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plutonic rocks
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diorites
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trondhjemite (1)
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granites
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granite porphyry (1)
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I-type granites (1)
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S-type granites (1)
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granodiorites (1)
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ultramafics
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Primary terms
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Africa
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IPOD
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France
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faults (21)
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Indian Ocean
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intrusions (8)
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Invertebrata
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Podocopida
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Trilobitomorpha
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Trilobita
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Phacopida (1)
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Brachiopoda
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Articulata
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Orthida (1)
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Thecideidina
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Bryozoa
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Cnidaria
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Hydrozoa (1)
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Echinodermata
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Mollusca
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Cephalopoda
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Goniatitida
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Gastropoda
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Turritellidae (1)
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Porifera
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Hexactinellida (1)
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Protista
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Rotaliina
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Rotalipora (2)
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Radiolaria (3)
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Thecamoeba (1)
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isostasy (1)
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mantle (3)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Albian (1)
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lower Aptian (1)
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Middle Cretaceous (2)
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Upper Cretaceous
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Hell Creek Formation (1)
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Senonian (3)
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Jurassic
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Arab Formation (2)
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Kimmeridgian (1)
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Triassic
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Lower Triassic
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Permian-Triassic boundary (2)
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Middle Triassic
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Anisian (1)
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Doig Formation (2)
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Montney Formation (2)
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metals
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uranium
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alkali metals
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rubidium
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Rb-87/Sr-86 (1)
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alkaline earth metals
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strontium
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Rb-87/Sr-86 (1)
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Sr-87/Sr-86 (3)
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lead
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U-238/Pb-206 (1)
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platinum group
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Os-188/Os-187 (1)
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-
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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Sm-147/Nd-144 (1)
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samarium
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Sm-147/Nd-144 (1)
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yttrium (1)
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rhenium (1)
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metamorphic rocks
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North America
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Basin and Range Province (2)
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Gulf Coastal Plain (2)
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Saint Lawrence Lowlands (2)
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ocean circulation (1)
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Ocean Drilling Program
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Leg 113
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Leg 122
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ODP Site 761 (1)
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Leg 181 (1)
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ocean floors (2)
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Pacific Ocean
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paleoclimatology (6)
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Paleozoic
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Carboniferous
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Upper Carboniferous (1)
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Devonian
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Upper Devonian
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Hanson Creek Formation (1)
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lower Paleozoic (2)
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Edenian (1)
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Kope Formation (3)
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Vinini Formation (1)
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Permian
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Americus Limestone Member (1)
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Permian-Triassic boundary (2)
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Silurian
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Llandovery (2)
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plate tectonics (27)
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Precambrian
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sea-level changes (11)
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South America
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
diachronism
Evidence for transpression in the Picuris orogen: The deformation record of the Marqueñas Formation metaconglomerate, Picuris Mountains, New Mexico, USA Open Access
Diachronous end-Permian terrestrial crises in North and South China Open Access
A review and tectonic interpretation of the Taconian–Grampian tract between Newfoundland and Scotland: diachronous accretion of an extensive forearc–arc–backarc system to a hyperextended Laurentian margin and subsequent subduction polarity reversal Available to Purchase
Abstract The Taconian–Grampian tract was characterized by a diachronous collision of a north-facing oceanic arc–forearc terrane and associated backarc basins with an irregular Laurentian margin with hyperextended segments. Hyperextension produced outboard continental terranes, separated by exhumed subcontinental mantle from the inboard margin. The exhumed mantle facilitated continued subduction of the extended margin after it had entered the trench. Enhanced slab-rollback resulted in spreading in lenticular backarc basins, which gradually transitioned along-strike into extensional arcs where rollback was less. Obduction of the oceanic elements onto the irregular Laurentian margin was followed by diachronous slab breakoff and a subduction polarity reversal, such that south- and north-dipping subduction zones locally were coeval along-strike. The polarity flip changed the convergence obliquity from dextral to sinistral and was accompanied by shallowing of the subducting slab near the end of the Middle Ordovician. Strike-slip movements locally juxtaposed segments where tectonic events occurred at different times, producing conflicting relationships. Slab breakoff produced punctuated magmatism, largely driven by mantle-derived melts, and drove and/or enhanced metamorphism in the overlying and enveloping crustal rocks. Boninite was generated episodically over a time span of 32 myr; the oldest Cambrian phase in the Lushs Bight Oceanic Tract (LBOT) and correlatives was associated with subduction initiation.
Multiple diachronous “Black Seas” mimic global ocean anoxia during the latest Devonian Open Access
Foraminifers and conodonts in the Danlu section, South China: implications for the Viséan–Serpukhovian boundary (Mississippian) Available to Purchase
Diachronous subduction, closure of the Proto-Tethys Ocean, and collisional accretion of microcontinents: Insights from the early Paleozoic intermediate-mafic rocks in the Amdo microcontinent of the Tibetan Plateau Available to Purchase
Linking the Pinware, Baraboo, and Picuris orogens: Recognition of a trans-Laurentian ca. 1520–1340 Ma orogenic belt Open Access
ABSTRACT It is proposed that the Pinware orogen of eastern Canada, the Baraboo orogen of the midcontinent, and the Picuris orogen of the southwestern United States delineate a previously unrecognized, ~5000-km-long, ca. 1520–1340 Ma trans-Laurentian orogenic belt. All three orogenic provinces are characterized by Mesoproterozoic sedimentation, magmatism, metamorphism, and deformation—the hallmarks of a tectonically active plate margin. Tectonism was diachronous, with the earliest stages beginning ca. 1520 Ma in eastern Canada and ca. 1500 Ma in the southwest United States. Magmatic zircon age distributions are dominated by Mesoproterozoic, unimodal to multimodal age peaks between ca. 1500 and 1340 Ma. The onset of magmatism in the Pinware and Baraboo orogens was ca. 1520 Ma, and onset for the Picuris orogen was ca. 1485 Ma. Detrital zircon age distributions within each orogenic province yield maximum depositional ages between ca. 1570 and 1450 Ma. Minimum depositional ages generally fall between ca. 1500 and 1435 Ma, as constrained by crosscutting intrusions, metatuff layers, or the age of subsequent metamorphism. Metamorphic mineral growth ages from zircon, garnet, and monazite yield peak ages between ca. 1500 and 1350 Ma and tend to be older in the Pinware and Baraboo orogens than in the Picuris orogen. The 40 Ar/ 39 Ar cooling ages for hornblende, muscovite, and biotite yield significant peak ages between ca. 1500 and 1350 Ma in the Baraboo and Picuris orogens. We propose that the Pinware-Baraboo-Picuris orogen formed in a complex, diachronous, convergent margin setting along the southern edge of Laurentia from ca. 1520 to 1340 Ma.
The Ordovician South Mayo Trough, a basin that recorded the passage of a triple junction along the Laurentian margin Available to Purchase
ABSTRACT Tectonic models for arc-continent collision can be overly complex where, for example, diachronous sedimentation and deformation along a single plate boundary are attributed to separate tectonic events. Furthermore, continuous sedimentation in a single basin recording a diachronous collision along a plate margin makes it difficult to use classical unconformable relationships to date an orogenic phase. In this chapter, we describe the Ordovician South Mayo Trough of western Ireland, a remarkable example of such a basin. It originated in the late Cambrian–Early Ordovician as a Laurentia-facing oceanic forearc basin to the Lough Nafooey arc. This arc was split by a spreading ridge to form a trench-trench-ridge triple junction at the trench. The basin remained below sea level during Grampian/Taconic arc-continent collision and, following subduction flip, received sediment from an active continental margin. Sedimentation ended during Late Ordovician Mayoian “Andean”-style shortening, broadly coeval with a marked fall in global sea level. These major tectonic events are traced through the nature of the detritus and volcanism in this basin, which is preserved in a mega-syncline. The Grampian orogen is not recorded as a regional unconformity, but as a sudden influx of juvenile metamorphic detritus in a conformable sequence.
Discussion of Searle, ‘Tectonic evolution of the Caledonian orogeny in Scotland: a review based on the timing of magmatism, metamorphism and deformation’ Available to Purchase
Syn-rift Cretaceous deformation in the Agly Variscan Massif (Eastern Pyrenees, France) Open Access
Petrogenesis of the crystalline basement along the western Gulf of Mexico: Postcollisional magmatism during the formation of Pangea Available to Purchase
ABSTRACT The supercontinent of Pangea formed through the diachronous collision of Laurussia and Gondwana during the late Paleozoic. While magmatism associated with its formation is well documented in the Variscan orogeny of Europe and Alleghanian orogeny of the United States, little is known about the Sonora orogeny of northern Mexico. This paper reports geochronology (U-Pb zircon), whole-rock geochemistry, and Lu-Hf zircon isotope data on basement cores from the western Gulf of Mexico, which were used to develop a tectonomagmatic model for pre- to post-Pangea amalgamation. Our results suggest the existence of three distinct phases of magmatism, produced during different stages of continental assembly and disassembly. The first phase consists of Early Permian (294–274 Ma; n = 3) granitoids with geochemical signatures indicative of a continental arc tectonic setting. This phase formed on the margins of Gondwana during the closure of the Rheic Ocean, prior to the final amalgamation of Pangea. It likely represents a lateral analogue of late Carboniferous–Early Permian granitoids that intrude the Acatlán and Oaxacan Complexes. The second phase of magmatism includes Late Permian–Early Triassic (263–243 Ma; n = 13) granitoids with suprasubduction geochemical affinities. However, Lu-Hf isotope data indicate that these granitoids formed from crustal anatexis, with ε Hf values and two-step Hf depleted mantle model ages (T DM[Hf] ) comparable to the Oaxaquia continental crust into which they intrude. This phase of magmatism is likely related to coeval granitoids in the Oaxaca area and Chiapas Massif. We interpret it to reflect late- to postcollisional magmatism along the margin of Gondwana following the assembly of Pangea. Finally, the third phase of magmatism includes Early–Middle Jurassic (189–164 Ma; n = 2) mafic porphyries, which could be related to the synchronous suprasubduction magmatism associated with the Nazas arc. Overall, our results are consistent with Pangea assembly through diachronous collision of Laurussia and Gondwana during subduction of the Rheic Ocean. They suggest that postorogenic magmatism in the western termination of the Rheic suture occurred under the influence of a Panthalassan subduction zone, before opening of the Gulf of Mexico.
A Lower Devonian age for the Corvock Granite and its significance for the structural history of South Mayo and the Laurentian margin of western Ireland Available to Purchase
Petrogenesis of Early Paleozoic high Sr/Y intrusive rocks from the North Qilian orogen: Implication for diachronous continental collision Open Access
Composite and diachronous stratigraphic surfaces in low-gradient, transitional settings: The J-3 “unconformity” and the Curtis Formation, east-central Utah, U.S.A. Available to Purchase
Conodont Biostratigraphy-Constrained Diachronous Lithofacies, Boone Group (Upper Osagean to Lower Meramecian), Western Ozarks: Breakdown of Lithostratigraphic Correlations at the Regional Scale Available to Purchase
ABSTRACT Facies analysis utilizing a conodont biostratigraphic framework is a powerful tool for evaluating genetic relationships of Osagean–basal Meramecian strata within the Ozark region (Arkansas–Missouri–Oklahoma) of the southern midcontinent. This investigation builds upon previous work cited herein, and suggests that some lithostratigraphic divisions, although useful in differentiating strata in a localized setting, may not be suitable for regional correlations within the Boone Group. High-resolution conodont biostratigraphy demonstrates the diachronous nature of lithostratigraphic divisions within the Boone Group, with both the Reeds Spring Formation and Bentonville Formation (Burlington–Keokuk) clearly becoming younger as they are traced from southwestern Missouri into northern Arkansas and northeastern Oklahoma. Subsequent facies analysis shows that the Reeds Spring Formation represents deposition within outer ramp through proximal middle ramp settings (low to moderate energy), whereas the Bentonville Formation (Burlington–Keokuk) records deposition within proximal middle ramp to inner ramp settings (moderate to high energy). Integration of facies analysis and conodont biostratigraphy-based relative chronostratigraphy provides the basis for construction of four time-slice maps illustrating the distribution of time-correlative facies belts. Together, these time-slice maps deliver a clearer representation of the evolution of Boone Group carbonate ramp deposition during the Osagean, which was characterized by overall shallowing-upward and progradation to south and southwest.