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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
East Africa
-
Mozambique (1)
-
-
Madagascar
-
Mahajanga Basin (1)
-
-
Nubian Shield (1)
-
Southern Africa
-
Botswana (2)
-
Kaapvaal Craton (1)
-
Kalahari Craton (1)
-
Karoo Basin (2)
-
Lesotho (1)
-
Namaqualand (1)
-
Namibia (1)
-
South Africa
-
Bushveld Complex (2)
-
Cape Province region (1)
-
Free State South Africa (1)
-
-
Swaziland (1)
-
Zimbabwe
-
Belingwe greenstone belt (1)
-
Great Dyke (1)
-
-
-
-
Altiplano (1)
-
Antarctica
-
Antarctic Peninsula (1)
-
East Antarctica (2)
-
Ellsworth Land (1)
-
Queen Maud Land (3)
-
Transantarctic Mountains (1)
-
-
Arctic Ocean
-
Amerasia Basin (1)
-
-
Arctic region
-
Greenland
-
East Greenland (1)
-
Skaergaard Intrusion (2)
-
South Greenland (1)
-
-
Russian Arctic
-
New Siberian Islands (1)
-
-
-
Arran (2)
-
Asia
-
Altai Mountains (1)
-
Altai-Sayan region (1)
-
Arabian Peninsula
-
Arabian Shield (3)
-
Saudi Arabia
-
Hail Saudi Arabia (1)
-
-
-
Baikal region (1)
-
Buryat Russian Federation (1)
-
Central Asia
-
Kazakhstan
-
Kokchetav Kazakhstan
-
Kokchetav Massif (1)
-
-
-
-
Chukotka Russian Federation (1)
-
Euphrates River (1)
-
Far East
-
Burma (1)
-
China
-
Dabie Mountains (1)
-
Fujian China (1)
-
Gansu China
-
Hexi Corridor (1)
-
-
Guangdong China (1)
-
Inner Mongolia China (2)
-
Nanling (1)
-
North China Platform (6)
-
Qilian Mountains (1)
-
Qinghai China (1)
-
Shandong China (2)
-
South China Block (2)
-
Sulu Terrane (1)
-
Taihang Mountains (1)
-
Tarim Platform (1)
-
Xinjiang China
-
Junggar Basin (1)
-
Taklimakan Desert (1)
-
-
Xizang China (6)
-
Yangtze Platform (1)
-
Yunnan China (1)
-
-
Indonesia
-
Sunda Arc (1)
-
-
Japan
-
Hokkaido
-
Hidaka metamorphic belt (1)
-
-
-
Korea
-
South Korea
-
Okcheon Belt (1)
-
-
-
Vietnam (1)
-
-
Himalayas
-
Zanskar Range (1)
-
-
Indian Peninsula
-
India
-
Andhra Pradesh India
-
Cuddapah Basin (1)
-
-
Deccan Plateau (1)
-
Ghats
-
Eastern Ghats (1)
-
Western Ghats (1)
-
-
Gujarat India
-
Kutch India (1)
-
Saurashtra (1)
-
-
Kerala India (1)
-
Madhya Pradesh India (1)
-
Maharashtra India (1)
-
Northeastern India
-
Arunachal Pradesh India (1)
-
Assam India (1)
-
Meghalaya India (1)
-
-
Rajasthan India (1)
-
-
Jammu and Kashmir
-
Ladakh (1)
-
-
-
Indus-Yarlung Zangbo suture zone (1)
-
Irkutsk Russian Federation (1)
-
Kamchatka Russian Federation
-
Kamchatka Peninsula
-
Avacha (1)
-
Tolbachik (1)
-
-
-
Karakoram (1)
-
Khakasiya Russian Federation (1)
-
Krasnoyarsk Russian Federation
-
Taymyr Dolgan-Nenets Russian Federation
-
Norilsk region (5)
-
-
-
Middle East
-
Cyprus (1)
-
Dead Sea Rift (1)
-
Iran
-
Sanandaj-Sirjan Zone (2)
-
-
Israel
-
Timna (1)
-
-
Lebanon (1)
-
Syria (2)
-
Turkey
-
Anatolia (2)
-
Sea of Marmara region (1)
-
-
Zagros (1)
-
-
Qiangtang Terrane (5)
-
Siberia (1)
-
Siberian Platform (2)
-
Southeast Asia (1)
-
Tibetan Plateau (3)
-
Tien Shan (1)
-
West Siberia
-
Minusinsk Basin (1)
-
-
Yakutia Russian Federation
-
New Siberian Islands (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Caribbean Sea (1)
-
English Channel (1)
-
Hudson Bay (1)
-
Northwest Atlantic (1)
-
-
-
Atlantic Ocean Islands
-
Canary Islands
-
Lanzarote (1)
-
-
-
Atlantic region (1)
-
Australasia
-
Australia
-
Giles Complex (1)
-
Lachlan fold belt (2)
-
Musgrave Block (1)
-
Northern Territory Australia (1)
-
Victoria Australia (1)
-
Western Australia (1)
-
-
New Zealand
-
Coromandel Peninsula (1)
-
Tongariro (1)
-
Torlesse Terrane (1)
-
-
-
Avalon Zone (1)
-
Caledonides (1)
-
Canada
-
Arctic Archipelago (1)
-
Eastern Canada
-
Belcher Islands (1)
-
Gander Zone (1)
-
Maritime Provinces
-
New Brunswick (2)
-
Nova Scotia
-
Antigonish County Nova Scotia
-
Antigonish Nova Scotia (1)
-
-
Cape Breton Island (1)
-
-
-
Meguma Terrane (1)
-
Newfoundland and Labrador
-
Labrador
-
Kiglapait (1)
-
Nain Massif (5)
-
Voisey's Bay Deposit (7)
-
-
Newfoundland (7)
-
-
Ontario
-
Coldwell Complex (1)
-
Sudbury District Ontario (1)
-
Thunder Bay District Ontario (1)
-
-
Quebec
-
Labelle County Quebec (1)
-
Monteregian Hills (2)
-
-
-
Hudson Bay (1)
-
Muskox Intrusion (1)
-
Nunavut
-
Belcher Islands (1)
-
Ellesmere Island (1)
-
Kaminak Lake (1)
-
Sverdrup Islands
-
Axel Heiberg Island (1)
-
-
-
Queen Elizabeth Islands
-
Ellesmere Island (1)
-
Sverdrup Islands
-
Axel Heiberg Island (1)
-
-
-
Stikinia Terrane (1)
-
Ungava (1)
-
Western Canada
-
British Columbia
-
Vancouver Island (1)
-
-
Canadian Cordillera (1)
-
Coppermine River (1)
-
Manitoba (1)
-
Northwest Territories (4)
-
Saskatchewan (2)
-
-
-
Caribbean region
-
West Indies
-
Antilles
-
Lesser Antilles
-
Martinique (1)
-
-
-
-
-
Cascade Range (1)
-
Cascadia subduction zone (1)
-
Central America
-
Guatemala
-
Pacaya (1)
-
-
Honduras (1)
-
Nicaragua (1)
-
-
Commonwealth of Independent States
-
Kazakhstan
-
Kokchetav Kazakhstan
-
Kokchetav Massif (1)
-
-
-
Russian Federation
-
Baikal region (1)
-
Buryat Russian Federation (1)
-
Chukotka Russian Federation (1)
-
Irkutsk Russian Federation (1)
-
Kamchatka Russian Federation
-
Kamchatka Peninsula
-
Avacha (1)
-
Tolbachik (1)
-
-
-
Khakasiya Russian Federation (1)
-
Krasnoyarsk Russian Federation
-
Taymyr Dolgan-Nenets Russian Federation
-
Norilsk region (5)
-
-
-
Minusinsk Basin (1)
-
Russian Arctic
-
New Siberian Islands (1)
-
-
Siberian Platform (2)
-
Yakutia Russian Federation
-
New Siberian Islands (1)
-
-
-
West Siberia
-
Minusinsk Basin (1)
-
-
-
Cordillera de la Costa (1)
-
Espanola Basin (2)
-
Europe
-
Alps
-
Eastern Alps
-
Carnic Alps (1)
-
Dinaric Alps (1)
-
Dolomites (1)
-
Julian Alps (1)
-
-
-
Carpathians
-
Eastern Carpathians (1)
-
-
Central Europe
-
Black Forest (1)
-
Bohemian Massif (1)
-
Germany
-
Baden-Wurttemberg Germany
-
Katzenbuckel (1)
-
-
Hesse Germany
-
Wetterau (1)
-
-
Rhineland-Palatinate Germany
-
Laacher See (1)
-
-
-
Upper Rhine Graben (1)
-
-
Pannonian Basin (1)
-
Southern Europe
-
Bulgaria
-
Bulgarian Rhodope Mountains (1)
-
-
Dinaric Alps (1)
-
Iberian Peninsula
-
Central Iberian Zone (1)
-
Iberian Massif (2)
-
Spain
-
Castilla y Leon Spain
-
Salamanca Spain (1)
-
-
Iberian Mountains (1)
-
-
-
Italy
-
Apennines (1)
-
Apulia Italy (1)
-
Campania Italy
-
Naples Italy
-
Ischia (1)
-
-
Phlegraean Fields (1)
-
Roccamonfina (1)
-
-
Sardinia Italy
-
Sulcis (1)
-
-
Sicily Italy
-
Hyblean Plateau (1)
-
Lipari Islands
-
Stromboli (1)
-
-
Mount Etna (1)
-
-
Tuscany Italy (1)
-
-
Rhodope Mountains
-
Bulgarian Rhodope Mountains (1)
-
-
Romania
-
Transylvania
-
Harghita Mountains (1)
-
Persani Mountains (1)
-
-
-
Serbia (1)
-
-
Variscides (3)
-
Western Europe
-
France
-
Armorican Massif (1)
-
Brittany (1)
-
Central Massif (1)
-
Finistere France (1)
-
Languedoc (1)
-
Var France
-
Maures Massif (1)
-
-
-
Ireland (2)
-
Scandinavia
-
Finland (2)
-
Sweden (1)
-
-
United Kingdom
-
Great Britain
-
England
-
Cornubian Batholith (1)
-
South-West England (1)
-
-
Scotland
-
Argyllshire Scotland
-
Islay (1)
-
Mull Island (2)
-
-
Hebrides
-
Inner Hebrides
-
Islay (1)
-
Isle of Skye (2)
-
Mull Island (2)
-
Raasay (1)
-
Rhum (1)
-
-
-
Highland region Scotland
-
Ardnamurchan (1)
-
Inverness-shire Scotland
-
Isle of Skye (2)
-
Raasay (1)
-
Rhum (1)
-
-
Sutherland Scotland (1)
-
-
-
-
Northern Ireland
-
Antrim Northern Ireland (1)
-
-
-
-
-
Highland Boundary Fault (1)
-
Indian Ocean
-
Mid-Indian Ridge
-
Central Indian Ridge (1)
-
-
Red Sea
-
Red Sea Rift (1)
-
-
-
Indian Ocean Islands
-
Madagascar
-
Mahajanga Basin (1)
-
-
Seychelles (1)
-
-
Kerguelen Plateau (1)
-
Marble Mountains (1)
-
Medicine Lake (1)
-
Mediterranean region (1)
-
Mediterranean Sea
-
West Mediterranean
-
Tyrrhenian Basin (1)
-
Tyrrhenian Sea (1)
-
-
-
Mexico
-
Baja California Mexico (1)
-
Tamaulipas Mexico (1)
-
Trans-Mexican volcanic belt (2)
-
-
North America
-
Appalachians
-
Blue Ridge Mountains (1)
-
Northern Appalachians (4)
-
-
Basin and Range Province
-
Great Basin (3)
-
-
Canadian Shield
-
Churchill Province
-
Hearne Province (1)
-
-
Grenville Province
-
Central Metasedimentary Belt (2)
-
-
Slave Province (1)
-
Superior Province
-
Abitibi Belt (1)
-
English River Belt (1)
-
Uchi Subprovince (1)
-
-
-
Keweenawan Rift (4)
-
Lake of the Woods (1)
-
Lake Superior region (1)
-
North American Cordillera
-
Canadian Cordillera (1)
-
-
Peninsular Ranges Batholith (2)
-
Rio Grande Depression (1)
-
Rio Grande Rift (2)
-
Rocky Mountains
-
U. S. Rocky Mountains
-
San Juan Mountains (1)
-
-
-
Saint Lawrence Lowlands (1)
-
-
North Island (3)
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific
-
Gulf of California (1)
-
-
Peru-Chile Trench (1)
-
-
North Pacific
-
Northeast Pacific
-
Gulf of California (1)
-
-
-
South Pacific (1)
-
West Pacific
-
Banda Arc (1)
-
-
-
Pacific region (1)
-
Peninsular Ranges (1)
-
Russian Platform (1)
-
Saint Kilda (1)
-
Sierra Nevada (5)
-
South America
-
Andes
-
Central Andes (1)
-
-
Argentina
-
Chubut Argentina (1)
-
Santa Cruz Argentina
-
Deseado Massif (1)
-
-
-
Bolivia
-
Oruro Bolivia (1)
-
-
Chile (2)
-
Patagonia (3)
-
Precordillera (1)
-
-
South Mountain Batholith (4)
-
Taranaki Basin (1)
-
United States
-
Alaska
-
Kodiak Island (1)
-
-
Arizona
-
Apache County Arizona (1)
-
Mohave County Arizona (1)
-
-
Blue Ridge Mountains (1)
-
California
-
Central California (1)
-
El Dorado County California (1)
-
Inyo County California (1)
-
Kern County California (1)
-
Lassen Volcanic National Park (1)
-
Los Angeles County California (1)
-
Mono County California (1)
-
Northern California (1)
-
San Bernardino County California (1)
-
San Gabriel Mountains (1)
-
Sierra Nevada Batholith (2)
-
Siskiyou County California
-
Medicine Lake Highland (1)
-
Mount Shasta (1)
-
-
Southern California (3)
-
-
Colorado
-
Rio Grande County Colorado (1)
-
Teller County Colorado
-
Cripple Creek Colorado (1)
-
-
-
Colorado Plateau (3)
-
Great Basin (3)
-
Idaho
-
Fremont County Idaho (1)
-
-
Idaho Batholith (1)
-
Maine
-
Hancock County Maine (1)
-
-
Minnesota
-
Chisago County Minnesota (1)
-
Duluth Complex (3)
-
Lake County Minnesota (1)
-
Saint Louis County Minnesota
-
Partridge River Intrusion (1)
-
-
-
Mojave Desert (1)
-
Nevada (3)
-
New Mexico (3)
-
Oregon
-
Harney County Oregon
-
Steens Mountain (2)
-
-
Malheur County Oregon (1)
-
-
U. S. Rocky Mountains
-
San Juan Mountains (1)
-
-
Utah
-
Beaver County Utah (1)
-
Garfield County Utah (1)
-
Iron County Utah (1)
-
Millard County Utah (1)
-
Piute County Utah (1)
-
Sevier County Utah (1)
-
Washington County Utah (1)
-
Wayne County Utah (1)
-
-
Virginia (1)
-
Western U.S. (1)
-
Wisconsin
-
Polk County Wisconsin (1)
-
-
Wyoming
-
Park County Wyoming (1)
-
Teton County Wyoming (1)
-
-
Yellowstone National Park (1)
-
-
Vulture Mountain (1)
-
White Mountains (1)
-
-
commodities
-
barite deposits (1)
-
bauxite deposits (1)
-
brines (1)
-
construction materials (1)
-
diamond deposits (1)
-
fluorspar deposits (1)
-
metal ores
-
cobalt ores (4)
-
copper ores (28)
-
gold ores (4)
-
nickel ores (26)
-
niobium ores (2)
-
palladium ores (1)
-
platinum ores (15)
-
rare earth deposits (2)
-
strontium ores (1)
-
tellurium ores (1)
-
tin ores (1)
-
zinc ores (1)
-
-
mineral deposits, genesis (21)
-
mineral exploration (6)
-
-
elements, isotopes
-
boron
-
B-11/B-10 (1)
-
-
carbon
-
C-13/C-12 (1)
-
C-14/C-12 (1)
-
-
chemical ratios (14)
-
halogens
-
chlorine (2)
-
fluorine (3)
-
-
hydrogen
-
D/H (1)
-
-
incompatible elements (4)
-
isotope ratios (119)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (1)
-
C-14/C-12 (1)
-
Pb-206/Pb-204 (29)
-
Pb-207/Pb-204 (21)
-
Pb-208/Pb-204 (21)
-
Rb-87/Sr-86 (8)
-
Re-187/Os-188 (2)
-
Sm-147/Nd-144 (7)
-
Zn-65 (1)
-
-
stable isotopes
-
Ar-40 (1)
-
Ar-40/Ar-39 (1)
-
B-11/B-10 (1)
-
C-13/C-12 (1)
-
C-14/C-12 (1)
-
D/H (1)
-
Fe-56/Fe-54 (1)
-
Fe-57/Fe-54 (1)
-
Hf-177/Hf-176 (19)
-
Nd-144/Nd-143 (65)
-
O-16 (1)
-
O-17 (1)
-
O-18 (1)
-
O-18/O-16 (21)
-
Os-188/Os-187 (5)
-
Pb-206/Pb-204 (29)
-
Pb-207/Pb-204 (21)
-
Pb-208/Pb-204 (21)
-
Rb-87/Sr-86 (8)
-
Re-187/Os-188 (2)
-
S-33/S-32 (2)
-
S-34/S-32 (13)
-
S-36 (1)
-
Sm-147/Nd-144 (7)
-
Sr-87/Sr-86 (73)
-
-
-
large-ion lithophile elements (2)
-
Lu/Hf (4)
-
metals
-
actinides
-
thorium (1)
-
-
alkali metals
-
cesium (2)
-
lithium (3)
-
potassium (3)
-
rubidium
-
Rb-87/Sr-86 (8)
-
-
sodium (1)
-
-
alkaline earth metals
-
barium (2)
-
calcium (1)
-
magnesium (2)
-
strontium
-
Rb-87/Sr-86 (8)
-
Sr-87/Sr-86 (73)
-
-
-
aluminum (1)
-
antimony (1)
-
arsenic (1)
-
bismuth (1)
-
chromium (1)
-
gold (1)
-
hafnium
-
Hf-177/Hf-176 (19)
-
-
iron
-
Fe-56/Fe-54 (1)
-
Fe-57/Fe-54 (1)
-
ferric iron (1)
-
ferrous iron (1)
-
-
lead
-
Pb-206/Pb-204 (29)
-
Pb-207/Pb-204 (21)
-
Pb-208/Pb-204 (21)
-
-
nickel (1)
-
niobium (5)
-
platinum group
-
osmium
-
Os-188/Os-187 (5)
-
Re-187/Os-188 (2)
-
-
palladium (1)
-
palladium ores (1)
-
platinum (1)
-
platinum ores (15)
-
-
precious metals (1)
-
rare earths
-
lutetium (1)
-
neodymium
-
Nd-144/Nd-143 (65)
-
Sm-147/Nd-144 (7)
-
-
samarium
-
Sm-147/Nd-144 (7)
-
-
scandium (1)
-
ytterbium (1)
-
yttrium (3)
-
-
rhenium
-
Re-187/Os-188 (2)
-
-
silver (1)
-
tantalum (3)
-
thallium (1)
-
titanium (4)
-
zinc
-
Zn-65 (1)
-
-
zirconium (1)
-
-
noble gases
-
argon
-
Ar-40 (1)
-
Ar-40/Ar-39 (1)
-
-
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oxygen
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O-18/O-16 (21)
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phosphorus (2)
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tellurium (3)
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fossils
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Chordata
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Vertebrata
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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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Invertebrata
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Protista
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geochronology methods
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geologic age
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Cenozoic
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Quaternary
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Allerod (1)
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-
-
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Tertiary
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Neogene
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Miocene
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Columbia River Basalt Group (4)
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Paleogene
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Ghost Rocks Formation (1)
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lower Paleocene (1)
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upper Cenozoic (3)
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Dalradian (1)
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Mesozoic
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Cretaceous
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Lower Cretaceous (9)
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Upper Cretaceous
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Kodiak Formation (1)
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Jurassic
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Josephine Ophiolite (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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Upper Triassic
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Moldanubian (2)
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Paleozoic
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Cambrian
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Devonian
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lower Paleozoic (2)
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Ordovician
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Meguma Group (5)
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Permian
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Upper Permian
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Permian-Triassic boundary (2)
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Silurian
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Upper Silurian (2)
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upper Paleozoic (1)
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Phanerozoic (1)
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Precambrian
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Animikie Group (1)
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J-M Reef (1)
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Mesoarchean (2)
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Rice Lake Group (1)
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Catoctin Formation (1)
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upper Precambrian
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Proterozoic
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Neoproterozoic
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Paleoproterozoic
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Aphebian
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Svecofennian (1)
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Thomson Formation (1)
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Virginia Formation (1)
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Rhenohercynian (1)
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Saxothuringian (1)
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igneous rocks
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igneous rocks
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feldspathoid rocks (1)
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kimberlite (2)
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granites
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S-type granites (5)
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granodiorites (8)
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minette (2)
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monzodiorite (5)
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porphyry
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volcanic rocks
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basalts
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flood basalts (13)
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basanite (6)
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komatiite (3)
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metaplutonic rocks (1)
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greisen (2)
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metavolcanic rocks (7)
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minerals
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oxides
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silicates
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amphibole group
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pyroxene group
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clinopyroxene
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orthopyroxene (2)
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framework silicates
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feldspar group
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alkali feldspar
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sanidine (1)
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plagioclase
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leucite (1)
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nepheline group
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silica minerals
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quartz (1)
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orthosilicates
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garnet group (4)
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olivine group
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titanite group
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zircon group
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zircon (42)
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ring silicates
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cordierite (1)
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tourmaline group
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sheet silicates
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mica group
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sulfates
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sulfides
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pyrrhotite (2)
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talnakhite (1)
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wehrlite (1)
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Primary terms
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absolute age (70)
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Africa
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Antarctica
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Asia
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Indonesia
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Japan
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Vietnam (1)
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Indus-Yarlung Zangbo suture zone (1)
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carbon
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Cenozoic
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Quaternary
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upper Pleistocene
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Tertiary
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Neogene
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Miocene
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
magma contamination
COMPOSITION OF MAFIC ROCK-FORMING MINERALS IN THE ROCKS OF THE BURPALA ALKALINE MASSIF ( Northern Baikal area ) Available to Purchase
Early Devonian Slab Melting of the Proto-Tethys Ocean: Insights from Adakitic Granitoids in the Jiayuguan Area, Hexi Corridor (NW China) Open Access
Geochemistry, U-Pb geochronology and Nd-Hf isotopes of leucocratic dykes in the Cape Spencer area, southern New Brunswick, Canada: insights into the Alleghanian orogeny in the northern Appalachians Open Access
Two syenitic phases in the Early Paleogene Silhouette Island volcano-plutonic complex, Seychelles Available to Purchase
Isotopic (Nd, Sr, Pb) Composition of the Permo–Triassic and Late Cretaceous Basaltoids in the Minusa Depression (Southern Siberia, Kop’evo Uplift): Heterogeneity of Mantle Sources of Mafic Magmas Available to Purchase
Paleogene igneous activity: North Atlantic plume-related magmatism Available to Purchase
The genetic relationship between coeval Ediacaran mafic and granitoid plutons in the Antigonish Highlands, Nova Scotia Available to Purchase
Abstract Granitic plutons dominated by felsic-intermediate compositions are commonly spatially and temporally associated with mafic intrusions; however, the genetic relationship between the apparently coeval but compositionally dissimilar magmas is controversial. To better understand this relationship, we present new lithogeochemical and isotopic data from coeval late Neoproterozoic plutonic rocks in the Antigonish Highlands of Nova Scotia where the regional context is well documented. The predominantly mafic Greendale Complex contains lamprophyre, appinites and leucocratic dykes. The appinites are remarkably variable in their textures, and consist of hornblende pegmatites, hornblende cumulates, porphyritic hornblende gabbro and coarse-grained, equigranular hornblende gabbro. Geochemical data show enrichment in large-ion lithophile elements and depletion in the high field strength elements suggesting an arc setting. ε Nd (607) values from the Greendale Complex range from +3.2 to +5.0 and are on average slightly more juvenile than coeval granitic rocks which have petrological characteristics typical of continental arc magmas. Hydrous mafic magmas were likely contaminated by subducted sediments and their ascent was facilitated by lithospheric-scale faults. Felsic magmas were derived by anatexis of heterogeneous Avalonian crust that oscillated between fluid-saturated to fluid-deficient (dehydration) melting, consistent with the evolution from arc to intra-arc rift environment.
Isotopic and geochemical characteristics of mid- to-late-Miocene continental and oceanic arc volcanic and intrusive rocks, central North Island and offshore, New Zealand Available to Purchase
Abstract Mid- to late-Miocene continental arc volcanism on the North Island of New Zealand is found in the Coromandel Peninsula, the Kiwitahi volcanic chain and the Taranaki Basin (Kora Volcano) offshore the western margin of the North Island. Coeval oceanic arc volcanism is also found along the offshore Colville Ridge/Kermadec Ridge north of New Zealand. This Pb–Sr–Nd–Hf isotopic study aims to evaluate mantle sources and potential crustal contaminants along these sections of the Miocene arc system. The Colville/Kermadec Ridge and Kora lavas have the lowest Sr (0.7029–0.7045) and highest Nd (0.51305–0.51292) ratios; the Coromandel and Kiwitahi lavas overlap (Sr = 0.704–0.706; Nd = 0.51268–0.51296). The Colville/Kermadec Ridge, Kora, and Coromandel/Kiwitahi rocks form three distinct arrays on Pb–Pb plots, all above the Northern Hemisphere Reference Line, but none trend towards local Mesozoic basement greywackes. Isotopic and trace element ratio variations suggest that subducted sediments are a component in Coromandel/Kiwitahi mafic lava sources. The younger, southern Kiwitahi lavas have a more depleted mantle source than that for the older, northern Kiwitahi chain. Evolved lavas commonly have interacted with Waipapa basement rocks. Kora rocks have compositions similar to those of back-arc lavas and have been emplaced as sills in a rift environment above a distinct subduction-modified mantle.