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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)
-
Southern Africa
-
South Africa
-
Limpopo South Africa (1)
-
-
-
-
Alpine Fault (2)
-
Antarctica
-
Transantarctic Mountains (1)
-
-
Asia
-
Altai Russian Federation (1)
-
Arabian Peninsula
-
Oman (1)
-
-
Buryat Russian Federation (1)
-
Central Asia
-
Kazakhstan
-
Eastern Kazakhstan (2)
-
-
-
Far East
-
China
-
Qinling Mountains (1)
-
Yunnan China (1)
-
-
Japan
-
Honshu
-
Ryoke Belt (1)
-
-
-
Philippine Islands (1)
-
-
Indian Peninsula
-
India
-
Bihar India (1)
-
Jharkhand India
-
Singhbhum India (1)
-
-
Karnataka India (1)
-
-
-
Middle East
-
Cyprus
-
Troodos Massif (1)
-
-
Iran (1)
-
Turkey
-
Anatolia (1)
-
Antalya Turkey (1)
-
Taurus Mountains (3)
-
-
Zagros (1)
-
-
Rudny Altai (2)
-
Sayan
-
Eastern Sayan (1)
-
-
-
Atlantic Ocean Islands
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Shetland Islands (1)
-
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Australasia
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New Zealand (3)
-
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Bay of Islands (1)
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Canada
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Eastern Canada
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Maritime Provinces
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New Brunswick (1)
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Newfoundland and Labrador
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Labrador (3)
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Newfoundland (4)
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Ontario (2)
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Quebec
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Thetford Mines (3)
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-
-
Western Canada
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British Columbia
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Pinchi Lake (1)
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Canadian Cordillera (1)
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Manitoba (2)
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Saskatchewan
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Lac La Ronge (1)
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Yukon Territory (3)
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-
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Caribbean region (1)
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Cascade Range (2)
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Central America
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Costa Rica (1)
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Commonwealth of Independent States
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Kazakhstan
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Eastern Kazakhstan (2)
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Rudny Altai (2)
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Russian Federation
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Altai Russian Federation (1)
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Buryat Russian Federation (1)
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Cross Lake (1)
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Death Valley (1)
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Dunnage Melange (1)
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Europe
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Alps
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Albanides (1)
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Central Alps (1)
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Eastern Alps
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Dinaric Alps (1)
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Swiss Alps
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Southern Swiss Alps (1)
-
-
-
Central Europe
-
Austria (1)
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Switzerland
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Aar Massif (1)
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Bern Switzerland (1)
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Swiss Alps
-
Southern Swiss Alps (1)
-
-
Valais Switzerland (1)
-
-
-
Pyrenees (3)
-
Southern Europe
-
Albania
-
Albanides (1)
-
-
Croatia (1)
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Dinaric Alps (1)
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Greece
-
Hellenides (1)
-
-
Iberian Peninsula
-
Spain
-
Andalusia Spain
-
Serrania de Ronda (2)
-
-
Basque Provinces Spain (1)
-
Betic Cordillera
-
Serrania de Ronda (2)
-
-
Cantabrian Basin (1)
-
Galicia Spain
-
Cabo Ortegal Complex (1)
-
-
-
-
Italy
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Piemonte Italy
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Lanzo Massif (1)
-
-
-
-
Variscides (1)
-
Western Europe
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France
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Armorican Massif (1)
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Dordogne France
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Perigord (1)
-
-
Lherz (1)
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Pyrenees-Orientales France (1)
-
Vendee France (1)
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-
Scandinavia
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Finland
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North Savo Finland
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Kuopio Finland (1)
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-
-
-
United Kingdom
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Great Britain
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Scotland
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Moine thrust zone (1)
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Shetland Islands (1)
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-
-
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Grandfather Mountain (1)
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Hunter Valley (1)
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Madison Range (1)
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Marcy Massif (1)
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Mediterranean region (1)
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Mediterranean Sea
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West Mediterranean
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Alboran Sea (1)
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-
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Mexico
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Sonora Mexico (1)
-
-
North America
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Appalachians
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Blue Ridge Province (1)
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Carolina slate belt (1)
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Cumberland Plateau (1)
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Northern Appalachians (1)
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Piedmont (1)
-
Southern Appalachians (2)
-
-
Basin and Range Province (3)
-
Canadian Shield
-
Grenville Province
-
Central Metasedimentary Belt (1)
-
-
Makkovik Province (1)
-
Nain Province (1)
-
Superior Province
-
Abitibi Belt (2)
-
-
-
Great Lakes region (1)
-
Grenville Front (1)
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North American Cordillera
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Canadian Cordillera (1)
-
-
Rocky Mountains
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U. S. Rocky Mountains
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Gore Range (1)
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Laramie Mountains (1)
-
Medicine Bow Mountains (1)
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Sawatch Range (1)
-
Spanish Peaks (1)
-
Tobacco Root Mountains (1)
-
-
-
Yukon-Tanana Upland (3)
-
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific
-
Gulf of Alaska (1)
-
-
-
North Pacific
-
Northeast Pacific
-
Gulf of Alaska (1)
-
-
-
-
Preston Peak (1)
-
Salmon River (1)
-
San Juan Islands (1)
-
Santa Catalina Mountains (2)
-
South America
-
Peru (1)
-
-
South Island (3)
-
United States
-
Alaska (4)
-
Arizona
-
Pima County Arizona (3)
-
Rincon Mountains (3)
-
Tucson Basin (1)
-
-
California
-
Del Norte County California (1)
-
Inyo County California
-
Panamint Range (1)
-
-
Siskiyou County California (1)
-
Southern California (1)
-
-
Cheyenne Belt (1)
-
Colorado
-
Gore Range (1)
-
Lake County Colorado (1)
-
Sawatch Range (1)
-
-
Georgia (1)
-
Great Smoky Mountains (1)
-
Idaho
-
Idaho County Idaho (2)
-
-
Kiokee Belt (1)
-
Klamath Mountains (1)
-
Minnesota
-
Duluth Complex (1)
-
Lake County Minnesota (1)
-
Saint Louis County Minnesota (1)
-
Vermilion Range (1)
-
-
Montana
-
Madison County Montana
-
Tobacco Root Mountains (1)
-
-
-
Nevada
-
Esmeralda County Nevada
-
Silver Peak Mountains (1)
-
-
-
New York
-
Adirondack Mountains (1)
-
Essex County New York (1)
-
-
North Carolina
-
Haywood County North Carolina (1)
-
Swain County North Carolina (1)
-
-
Oregon
-
Wallowa County Oregon (1)
-
Wallowa Mountains (1)
-
-
South Carolina (1)
-
Tennessee (1)
-
U. S. Rocky Mountains
-
Gore Range (1)
-
Laramie Mountains (1)
-
Medicine Bow Mountains (1)
-
Sawatch Range (1)
-
Spanish Peaks (1)
-
Tobacco Root Mountains (1)
-
-
Virginia
-
Albemarle County Virginia (1)
-
Nelson County Virginia (1)
-
-
Walker Lane (1)
-
Washington
-
Chelan County Washington (1)
-
Kittitas County Washington (1)
-
San Juan County Washington (1)
-
-
Wyoming
-
Albany County Wyoming (2)
-
Platte County Wyoming (1)
-
-
Wyoming Province (1)
-
-
-
commodities
-
metal ores
-
chromite ores (1)
-
copper ores (3)
-
gold ores (3)
-
iron ores (1)
-
lead ores (2)
-
lead-zinc deposits (3)
-
molybdenum ores (1)
-
polymetallic ores (3)
-
silver ores (1)
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zinc ores (2)
-
-
mineral deposits, genesis (6)
-
-
elements, isotopes
-
chemical ratios (2)
-
isotope ratios (4)
-
isotopes
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radioactive isotopes
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Ar-40/Ar-39 (1)
-
Re-187/Os-188 (1)
-
-
stable isotopes
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Ar-40/Ar-39 (1)
-
Nd-144/Nd-143 (2)
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O-18/O-16 (1)
-
Re-187/Os-188 (1)
-
Sr-87/Sr-86 (2)
-
-
-
metals
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (2)
-
-
-
gold (2)
-
platinum group
-
iridium (1)
-
osmium
-
Re-187/Os-188 (1)
-
-
palladium (1)
-
platinum (2)
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (2)
-
-
-
rhenium
-
Re-187/Os-188 (1)
-
-
titanium (1)
-
-
noble gases
-
argon
-
Ar-40/Ar-39 (1)
-
-
-
oxygen
-
O-18/O-16 (1)
-
-
phosphorus (1)
-
-
fossils
-
Chordata
-
Vertebrata (1)
-
-
Invertebrata
-
Protista
-
Radiolaria (2)
-
-
-
microfossils
-
Conodonta (1)
-
-
palynomorphs
-
miospores (1)
-
-
Plantae
-
algae
-
nannofossils (1)
-
-
-
thallophytes (1)
-
-
geochronology methods
-
(U-Th)/He (1)
-
Ar/Ar (7)
-
fission-track dating (2)
-
K/Ar (4)
-
paleomagnetism (1)
-
Pb/Pb (1)
-
Rb/Sr (2)
-
Sm/Nd (2)
-
thermochronology (2)
-
U/Pb (7)
-
U/Th/Pb (1)
-
-
geologic age
-
Cenozoic
-
Quaternary (1)
-
Tertiary
-
lower Tertiary (1)
-
Neogene
-
Miocene (2)
-
Pliocene (2)
-
-
Paleogene
-
lower Paleogene (1)
-
Paleocene (1)
-
-
Zambales Ophiolite (1)
-
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Albian (1)
-
Aptian (1)
-
-
Upper Cretaceous (5)
-
-
Jurassic
-
Lower Jurassic
-
Pliensbachian (1)
-
-
Upper Jurassic
-
Tithonian (1)
-
-
-
Triassic
-
Middle Triassic
-
Anisian (1)
-
-
-
-
Paleozoic
-
Cambrian (2)
-
Carboniferous
-
Upper Carboniferous (1)
-
-
lower Paleozoic
-
Bay of Islands Ophiolite (1)
-
-
Ordovician
-
Lower Ordovician
-
Arenigian (1)
-
-
-
Permian
-
Lower Permian (2)
-
-
upper Paleozoic (4)
-
-
Precambrian
-
Archean
-
Neoarchean (1)
-
Singhbhum Granite (1)
-
-
Great Smoky Group (1)
-
Noonday Dolomite (1)
-
North Shore Volcanics (1)
-
upper Precambrian
-
Proterozoic
-
Keweenawan (1)
-
Kunyang Group (1)
-
Mesoproterozoic (2)
-
Neoproterozoic
-
Tonian (1)
-
-
Paleoproterozoic
-
Dhanjori Group (1)
-
-
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
anorthosite (1)
-
diabase (2)
-
diorites
-
plagiogranite (1)
-
tonalite (1)
-
-
gabbros
-
troctolite (1)
-
-
granites (3)
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pegmatite (1)
-
ultramafics
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peridotites
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dunite (5)
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harzburgite (10)
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lherzolite (2)
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spinel peridotite (1)
-
-
-
-
volcanic rocks
-
basalts
-
mid-ocean ridge basalts (2)
-
-
pyroclastics
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ash-flow tuff (1)
-
-
-
-
ophiolite (19)
-
-
metamorphic rocks
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metamorphic rocks
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amphibolites (4)
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cataclasites (6)
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eclogite (1)
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gneisses
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banded gneiss (1)
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granite gneiss (1)
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orthogneiss (3)
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paragneiss (1)
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sillimanite gneiss (1)
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granulites (2)
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metaigneous rocks
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metabasalt (1)
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metabasite (1)
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metagabbro (1)
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metagranite (4)
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metaperidotite (1)
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serpentinite (3)
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metasedimentary rocks
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metapelite (1)
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paragneiss (1)
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metasomatic rocks
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serpentinite (3)
-
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mylonites
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blastomylonite (2)
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pseudotachylite (1)
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ultramylonite (2)
-
-
phyllites (1)
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schists (6)
-
-
ophiolite (19)
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meteorites
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meteorites (1)
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minerals
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carbonates
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calcite (1)
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dolomite (1)
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magnesite (1)
-
-
halides
-
chlorides
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halite (1)
-
-
-
minerals (2)
-
native elements
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graphite (2)
-
-
oxides
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rutile (1)
-
-
phosphates
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apatite (2)
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monazite (1)
-
-
silicates
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asbestos (1)
-
chain silicates
-
amphibole group
-
clinoamphibole
-
hornblende (3)
-
-
-
pyroxene group (1)
-
-
framework silicates
-
feldspar group
-
plagioclase (3)
-
-
silica minerals
-
quartz (8)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group (3)
-
olivine group
-
olivine (4)
-
-
sillimanite (1)
-
zircon group
-
zircon (5)
-
-
-
-
sheet silicates
-
chlorite group
-
chlorite (1)
-
-
clay minerals
-
kaolinite (1)
-
-
mica group
-
biotite (2)
-
muscovite (2)
-
-
sepiolite (1)
-
serpentine group
-
serpentine (1)
-
-
-
-
sulfates
-
anhydrite (1)
-
polyhalite (1)
-
-
sulfides (2)
-
-
Primary terms
-
absolute age (16)
-
Africa
-
Limpopo Belt (1)
-
Southern Africa
-
South Africa
-
Limpopo South Africa (1)
-
-
-
-
Antarctica
-
Transantarctic Mountains (1)
-
-
Asia
-
Altai Russian Federation (1)
-
Arabian Peninsula
-
Oman (1)
-
-
Buryat Russian Federation (1)
-
Central Asia
-
Kazakhstan
-
Eastern Kazakhstan (2)
-
-
-
Far East
-
China
-
Qinling Mountains (1)
-
Yunnan China (1)
-
-
Japan
-
Honshu
-
Ryoke Belt (1)
-
-
-
Philippine Islands (1)
-
-
Indian Peninsula
-
India
-
Bihar India (1)
-
Jharkhand India
-
Singhbhum India (1)
-
-
Karnataka India (1)
-
-
-
Middle East
-
Cyprus
-
Troodos Massif (1)
-
-
Iran (1)
-
Turkey
-
Anatolia (1)
-
Antalya Turkey (1)
-
Taurus Mountains (3)
-
-
Zagros (1)
-
-
Rudny Altai (2)
-
Sayan
-
Eastern Sayan (1)
-
-
-
Atlantic Ocean Islands
-
Shetland Islands (1)
-
-
Australasia
-
New Zealand (3)
-
-
bibliography (1)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
New Brunswick (1)
-
-
Newfoundland and Labrador
-
Labrador (3)
-
Newfoundland (4)
-
-
Ontario (2)
-
Quebec
-
Thetford Mines (3)
-
-
-
Western Canada
-
British Columbia
-
Pinchi Lake (1)
-
-
Canadian Cordillera (1)
-
Manitoba (2)
-
Saskatchewan
-
Lac La Ronge (1)
-
-
Yukon Territory (3)
-
-
-
Caribbean region (1)
-
Cenozoic
-
Quaternary (1)
-
Tertiary
-
lower Tertiary (1)
-
Neogene
-
Miocene (2)
-
Pliocene (2)
-
-
Paleogene
-
lower Paleogene (1)
-
Paleocene (1)
-
-
Zambales Ophiolite (1)
-
-
-
Central America
-
Costa Rica (1)
-
-
Chordata
-
Vertebrata (1)
-
-
clay mineralogy (1)
-
continental drift (1)
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crust (16)
-
crystal growth (2)
-
crystal structure (2)
-
crystallography (3)
-
data processing (1)
-
Deep Sea Drilling Project
-
Leg 19
-
DSDP Site 183 (1)
-
-
-
deformation (46)
-
diagenesis (1)
-
earthquakes (3)
-
economic geology (1)
-
Europe
-
Alps
-
Albanides (1)
-
Central Alps (1)
-
Eastern Alps
-
Dinaric Alps (1)
-
-
Swiss Alps
-
Southern Swiss Alps (1)
-
-
-
Central Europe
-
Austria (1)
-
Switzerland
-
Aar Massif (1)
-
Bern Switzerland (1)
-
Swiss Alps
-
Southern Swiss Alps (1)
-
-
Valais Switzerland (1)
-
-
-
Pyrenees (3)
-
Southern Europe
-
Albania
-
Albanides (1)
-
-
Croatia (1)
-
Dinaric Alps (1)
-
Greece
-
Hellenides (1)
-
-
Iberian Peninsula
-
Spain
-
Andalusia Spain
-
Serrania de Ronda (2)
-
-
Basque Provinces Spain (1)
-
Betic Cordillera
-
Serrania de Ronda (2)
-
-
Cantabrian Basin (1)
-
Galicia Spain
-
Cabo Ortegal Complex (1)
-
-
-
-
Italy
-
Piemonte Italy
-
Lanzo Massif (1)
-
-
-
-
Variscides (1)
-
Western Europe
-
France
-
Armorican Massif (1)
-
Dordogne France
-
Perigord (1)
-
-
Lherz (1)
-
Pyrenees-Orientales France (1)
-
Vendee France (1)
-
-
Scandinavia
-
Finland
-
North Savo Finland
-
Kuopio Finland (1)
-
-
-
-
United Kingdom
-
Great Britain
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Scotland
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Moine thrust zone (1)
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Shetland Islands (1)
-
-
-
-
-
-
faults (30)
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folds (15)
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foliation (24)
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fractures (3)
-
geochemistry (10)
-
geochronology (5)
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geomorphology (1)
-
geophysical methods (2)
-
heat flow (1)
-
igneous rocks
-
plutonic rocks
-
anorthosite (1)
-
diabase (2)
-
diorites
-
plagiogranite (1)
-
tonalite (1)
-
-
gabbros
-
troctolite (1)
-
-
granites (3)
-
pegmatite (1)
-
ultramafics
-
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
tectonite
The evolution of the Mesozoic lithosphere of northwestern Neotethys: a petrogenetic and geodynamic perspective Available to Purchase
Structural Analysis and Chronologic Constraints on Progressive Deformation within the Rincon Mountains, Arizona: Implications for Development of Metamorphic Core Complexes Available to Purchase
ABSTRACT Investigation of exhumed and well-exposed crustal-scale fault zones provides a rare window into the mechanics and timing of a broad range of deformation mechanisms, strain localization, and fault zone behavior. Here, we apply and integrate geo- and thermochronology analytics to carefully described brittle-ductile structural characteristics of the Catalina detachment zone as exposed in the Rincon Mountains domain of the Catalina-Rincon metamorphic core complex. This core complex is an exhumed extensional, broad-scale-normal-slip shear zone near Tucson, Arizona, USA. The Catalina detachment zone, as formulated here, is partitioned into a brittle-ductile fault-rock stratigraphy that evolved through progressive deformation. The Catalina-Rincon Mountains metamorphic core complex is one of the original type localities of Cordilleran metamorphic core complexes in western North America and has a long history of scientific study to document its structural characteristics and decipher its evolution in the context of Mid-Cenozoic extension. In this Memoir, we seek to provide a thorough accounting of the evolution of this shear zone, through integrating and synthesizing decades of previous research with new mapping, structural data, and geochronological analyses. The Catalina detachment zone stratigraphy is made up of the Catalina detachment fault, cataclasite, chloritic protocataclasite (referred to in most core-complex literature as “chlorite breccia”), subdetachment faults, and mylonites. When it was active, this zone accommodated a minimum of ~36 km of top-to-the-SW displacement. Characterizing the progressive evolution of this metamorphic core complex fault-rock stratigraphy requires a detailed accounting of the kinematic and temporal history of the detachment zone. Consequently, we first characterize and describe each structural unit and feature of this crustal-scale fault and shear zone network through the combination of previously published mapping, structural and microfabric analyses and newly collected structural data, thin-section analysis, large-scale mapping, and reinterpretation of stratigraphic and structural relations in the adjacent Tucson Basin. To improve our broad-scale mapping efforts, we employ multispectral analysis, successfully delineating specific fault-rock stratigraphic units at the core-complex scale. We then establish kinematic and absolute timing constraints by integrating results from well-log and seismic reflection data and with new and previously published zircon U-Pb, 40 Ar/ 39 Ar, 40 K/ 40 Ar geochronological, (U/Th)/He, 4 He/ 3 He, and apatite fission track thermochronological analyses. These temporal constraints indicate a deformation sequence that progressed through mylonitization, cataclasis, mini-detachment faulting, subdetachment faulting, and detachment faulting. This multidisciplinary investigation reveals that mylonitization occurred in late Oligocene time (ca. 26–22 Ma), coeval with rapid exhumation of the lower plate, and that slip on the Catalina detachment fault ceased by early Miocene, ca. 17 Ma. This temporal framework is consistent with results of our subsurface analysis of stratigraphic and structural relations in the Tucson Basin. Onset of metamorphic core complex deformation in southern Arizona slightly preceded that in central and western Arizona and southeasternmost California. Our compiled data sets suggest a shear-zone evolution model that places special emphasis on the transformation of mylonite to chloritic protocataclasite, and strain localization onto subdetachment, minidetachment, and detachment faults over time. Our model envisions mylonites drawn upward through a fluids-sourced brittle-ductile transition zone marked by elevated fluid pressures. This emphasis draws upon seminal work by Jane Selverstone and Gary Axen in analyzing structural-mechanical evolution in the Whipple Mountains metamorphic core complex. Progressive embrittlement and strength-hardening of the lower-plate rocks are manifest in intensive fracturing and minidetachment faulting, favored by the change in rheology produced by alteration-mineral products. Subdetachment faults, localized by earlier-formed ultramylonite and calc-silicate tectonite, coalesce to produce a proto-detachment fault, which marks the interface between mylonite and chlorite protocataclasite. Linking and smoothing of minidetachment faults within chloritic protocataclasite led to emergence of the Catalina detachment fault proper. All of this, from mylonite formation to final slippage on the detachment fault, kinematically conforms to top-to-the-SW shear. The macro-form of the antiformal-synformal corrugations of the Rincon Mountains began developing while mylonites were forming, continuing to amplify during proto-detachment faulting and detachment faulting. We emphasize and describe with examples how the timing and tectonic significance of mylonitization, cataclasis, and detachment faulting within the Catalina-Rincon metamorphic core complex continues to be hotly debated. Disagreements center today, as they have in the past, on the degree to which the structures and fabrics in the Rincons are Laramide products, mid-Cenozoic products, or some combination of both. In addressing tectonic heritage with respect to the Catalina detachment zone, it is hoped that the proposed model of progressive evolution of the Catalina detachment-zone shear zone will inform other studies of active and ancient metamorphic core complexes around the globe. In this regard, some new transferable emphases and methodologies emerged from this work, above and beyond what are now standard operating procedures for understanding crustal shear zones in general, and metamorphic core complexes particularly. For example, remote multispectral image analysis combined with ground-truth field analysis permitted mapping the full extent of chloritic protocataclasite, one of the best exposures of same globally, which is perhaps the most strategic fault rock in exploring the brittle-ductile transition. The added value of complete map control for chloritic protocataclasite is exploring, at its base in other metamorphic core complexes, for the presence of subdetachment faulting, i.e., proto-detachment faulting that influenced localization of detachment zones proper. Another example is the importance of continuously searching for certain mylonite protolith that yields opportunities for closely constraining timing of mylonitization. In our case, it is the Loma Alta mylonite that, more than any other protolith unit in the Rincon Mountains, permitted ‘locking’ the age of mylonitization as late Oligocene. We hope that insights from this detailed study will inform analyses of similar crustal-scale fault zones, both ancient and modern. Given its ready accessibility compared to most metamorphic core complexes, the Rincon Mountains present opportunities for others to use this contribution as part of the basis for exploiting this natural laboratory in research, teaching, and public science.
Interseismic creep of carbonate-hosted seismogenic normal faults: Insights from central Italy Open Access
Geology of the Liuyuan Complex, NW China: A Permian back-arc basin ophiolite at the southern edge of the Central Asian orogenic belt Available to Purchase
Strain partitioning in the Moine Nappe, northernmost Scotland Open Access
Grain-size-reducing- and mass-gaining processes in different hydrothermal fault rocks Available to Purchase
Mesozoic intracontinental ductile shearing along the Paleozoic Shangdan suture in the Qinling Orogen: Constraints from deformation fabrics and geochronology Available to Purchase
Coupled deformation and melt-migration events recording subduction initiation, Dun Mountain ophiolite, New Zealand Available to Purchase
Abstract The Dun Mountain ophiolite, South Island, New Zealand, records complex overprinting of mantle fabrics. Using structural observations, microstructural analysis, geothermometry, geobarometry, geochronology and rheological constraints from the Red Hills and Dun Mountain massifs, we propose that three deformation events occurred during the early stages of subduction initiation along the Permian margin of Gondwana. During the first deformation event, the lineated Two Tarns Harzburgite from the Red Hills formed in a transtensional setting associated with subduction initiation. Deformation was pervasive, homogeneous and simultaneous with boninitic melt migration through the unit; it also occurred at very fast strain rates (10 −9 –10 −8 s −1 ). During the second deformation event, progressive exhumation to c. 5 kbar and cooling to 1000°C led to the localization of melt and deformation into distinct zones (Dun Mountain, and the Plateau Complex, Plagioclase Zone and Ellis Stream Complex of the Red Hills). The third deformation event resulted in continued cooling and exhumation along serpentinized faults. This history provides a rare glimpse of the coupled fabric development and melt migration that sequentially develop in the early mantle wedge during the initiation of a subduction zone.