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NARROW
Format
Article Type
Journal
Publisher
Section
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
Central Africa
-
Congo Democratic Republic
-
Shaba Congo Democratic Republic (2)
-
-
-
East Africa
-
Zambia
-
Nchanga Zambia (1)
-
-
-
Kalahari Desert (2)
-
North Africa
-
Atlas Mountains
-
Moroccan Atlas Mountains (1)
-
-
Morocco
-
Moroccan Atlas Mountains (1)
-
Moulouya River (1)
-
Rif (1)
-
-
Tunisia (2)
-
-
Southern Africa
-
Botswana (1)
-
South Africa
-
Bushveld Complex (2)
-
Free State South Africa
-
Vredefort Dome (1)
-
-
Transvaal region (4)
-
Witwatersrand (3)
-
-
Zimbabwe (4)
-
-
West Africa
-
Liberia (1)
-
-
Zimbabwe Craton (1)
-
-
Alexander Terrane (1)
-
Annette Island (1)
-
Arctic Ocean
-
Barents Sea (1)
-
-
Arctic region
-
Greenland
-
East Greenland (1)
-
-
-
Asia
-
Arabian Peninsula
-
Oman
-
Oman Mountains (1)
-
-
United Arab Emirates
-
Fujairah (1)
-
-
-
Central Asia
-
Kyzylkum (1)
-
-
Far East
-
China
-
Inner Mongolia China (1)
-
Ordos Basin (1)
-
Sanjiang (1)
-
Xinjiang China (1)
-
Xizang China (1)
-
-
-
Indian Peninsula
-
India
-
Bundelkhand (1)
-
Dharwar Craton (2)
-
Karnataka India
-
Belgaum India (1)
-
Closepet Granite (1)
-
-
Rajasthan India
-
Aravalli Range (1)
-
Udaipur India (1)
-
-
Uttar Pradesh India
-
Jhansi India (2)
-
-
-
-
Middle East
-
Iran
-
Elburz (1)
-
-
Iraq (1)
-
Israel (1)
-
Jordan (1)
-
Turkey
-
Adana Turkey (1)
-
Anatolia (1)
-
Taurus Mountains (1)
-
-
-
Siberia (1)
-
Tibetan Plateau (1)
-
Tien Shan (2)
-
Uzbekistan
-
Muruntau Deposit (1)
-
-
Yakutia Russian Federation (1)
-
-
Atlantic Ocean
-
North Atlantic
-
Bay of Biscay (1)
-
Gulf of Mexico
-
Challenger Knoll (1)
-
-
Irish Sea (1)
-
-
-
Australasia
-
Australia
-
Curnamona Province (1)
-
Lachlan fold belt (3)
-
New South Wales Australia
-
Cobar Australia (1)
-
Elura Mine (1)
-
-
Northern Territory Australia
-
HYC Deposit (1)
-
-
Queensland Australia
-
Century Deposit (1)
-
Mount Isa Australia (6)
-
Mount Isa Inlier (2)
-
-
South Australia
-
Olary Domain (1)
-
Olympic Dam Deposit (2)
-
-
Tasmania Australia
-
Rosebery Australia (1)
-
-
Victoria Australia (1)
-
Western Australia
-
Canning Basin (2)
-
Eastern Goldfields (4)
-
Hamersley Basin (1)
-
Kalgoorlie Australia (4)
-
Kambalda Australia (2)
-
Norseman-Wiluna Belt (1)
-
Yilgarn Craton (5)
-
-
-
-
Black Hills (1)
-
Broken Hill (2)
-
Caledonides (1)
-
Canada
-
Eastern Canada
-
Maritime Provinces
-
Nova Scotia
-
Gays River Deposit (2)
-
-
-
Meguma Terrane (1)
-
Newfoundland and Labrador
-
Newfoundland
-
Betts Cove (1)
-
Port au Port Peninsula (1)
-
-
-
Ontario
-
Cochrane District Ontario
-
Kidd Creek Mine (1)
-
Timmins Ontario (2)
-
-
Timiskaming District Ontario
-
Cobalt Ontario (1)
-
-
-
Quebec
-
Abitibi County Quebec
-
Val d'Or Quebec (1)
-
-
Noranda Quebec (1)
-
Sigma Mine (1)
-
-
-
Nunavut
-
Lupin Mine (1)
-
-
Richardson Mountains (1)
-
Western Canada
-
British Columbia
-
Omineca Mountains (1)
-
-
Canadian Cordillera (3)
-
Canadian Rocky Mountains (1)
-
Contwoyto Lake (1)
-
Lupin Mine (1)
-
Northwest Territories
-
Great Bear Lake (1)
-
Pine Point mining district (1)
-
-
Saskatchewan
-
La Ronge Domain (1)
-
Wollaston Lake Belt (1)
-
-
Yukon Territory
-
Blow River (1)
-
Wernecke Mountains (1)
-
-
-
-
Caribbean region
-
West Indies
-
Antilles
-
Greater Antilles
-
Hispaniola
-
Dominican Republic (1)
-
-
-
-
-
-
Commonwealth of Independent States
-
Azerbaijan (1)
-
Caucasus (1)
-
Kyzylkum (1)
-
Russian Federation
-
Bashkortostan Russian Federation (1)
-
Chechen-Ingush Russian Federation (1)
-
Kaliningrad Russian Federation (1)
-
Murmansk Russian Federation
-
Kola Peninsula (1)
-
-
Orenburg Russian Federation (1)
-
Samara Russian Federation (1)
-
Sverdlovsk Russian Federation (1)
-
Volga region (1)
-
Yakutia Russian Federation (1)
-
-
Ukraine
-
Crimea Ukraine
-
Kerch Peninsula (1)
-
-
Dnepropetrovsk Ukraine
-
Krivoy Rog Ukraine (1)
-
-
-
Urals
-
Southern Urals (1)
-
-
Uzbekistan
-
Muruntau Deposit (1)
-
-
-
Copperbelt (3)
-
Europe
-
Alps
-
Eastern Alps (1)
-
-
Azerbaijan (1)
-
Bashkortostan Russian Federation (1)
-
Carpathian Foredeep (1)
-
Caucasus (1)
-
Central Europe
-
Austria
-
Tyrol Austria (1)
-
-
Czech Republic (1)
-
Germany
-
Harz Mountains (1)
-
Rhineland-Palatinate Germany (1)
-
Saar-Nahe Basin (1)
-
Saxony-Anhalt Germany
-
Mansfeld Syncline (1)
-
-
-
Poland (2)
-
Switzerland (1)
-
Upper Rhine Graben (1)
-
-
Chechen-Ingush Russian Federation (1)
-
Fennoscandian Shield (1)
-
Kaliningrad Russian Federation (1)
-
Karelia (1)
-
Murmansk Russian Federation
-
Kola Peninsula (1)
-
-
Orenburg Russian Federation (1)
-
Samara Russian Federation (1)
-
Southern Europe
-
Greece
-
Greek Macedonia
-
Chalkidiki (3)
-
-
-
Iberian Peninsula
-
Spain
-
Basque Provinces Spain (1)
-
Cantabria Spain (1)
-
Cantabrian Basin (1)
-
-
-
Macedonia
-
Greek Macedonia
-
Chalkidiki (3)
-
-
-
-
Ukraine
-
Crimea Ukraine
-
Kerch Peninsula (1)
-
-
Dnepropetrovsk Ukraine
-
Krivoy Rog Ukraine (1)
-
-
-
Western Europe
-
France
-
Ardeche France (1)
-
Bas-Rhin France
-
Bouxwiller France (1)
-
-
Central Massif (1)
-
Gard France (1)
-
Indre-et-Loire France (1)
-
-
Ireland
-
Galway Ireland (1)
-
Meath Ireland (1)
-
-
Luxembourg (1)
-
Scandinavia
-
Finland (1)
-
Sweden (2)
-
-
United Kingdom
-
Great Britain
-
England
-
Cumbria England (3)
-
-
Scotland
-
Ayrshire Scotland (1)
-
-
-
Isle of Man (1)
-
-
-
-
Indian Ocean
-
Red Sea
-
Atlantis II Deep (4)
-
Red Sea Rift (2)
-
-
-
Lake District (3)
-
Marble Canyon (1)
-
McArthur Basin (1)
-
Mediterranean region (1)
-
Mediterranean Sea
-
West Mediterranean (1)
-
-
Mexico
-
Coahuila Mexico (1)
-
Sierra Madre Oriental (1)
-
Sonora Mexico (1)
-
-
Mount Lyell (1)
-
North America
-
Appalachian Basin (1)
-
Appalachians
-
Carolina slate belt (3)
-
Central Appalachians (1)
-
Northern Appalachians (3)
-
Southern Appalachians (2)
-
Valley and Ridge Province (1)
-
-
Basin and Range Province
-
Great Basin (1)
-
-
Canadian Shield
-
Slave Province (1)
-
Superior Province
-
Abitibi Belt (3)
-
Wabigoon Belt (1)
-
-
-
Great Plains (1)
-
Gulf Coastal Plain (2)
-
North American Cordillera
-
Canadian Cordillera (3)
-
-
Purcell Mountains (1)
-
Rocky Mountains
-
Canadian Rocky Mountains (1)
-
U. S. Rocky Mountains
-
San Juan Mountains (1)
-
-
-
Western Interior (1)
-
-
Oceania
-
Melanesia
-
Fiji
-
Viti Levu (1)
-
-
New Caledonia (1)
-
-
-
Pacific Ocean
-
South Pacific
-
Southwest Pacific
-
Coral Sea (1)
-
-
-
West Pacific
-
Southwest Pacific
-
Coral Sea (1)
-
-
-
-
Red Mountain (1)
-
Salmon River (1)
-
San Juan Basin (1)
-
South America
-
Andes
-
Eastern Cordillera (1)
-
-
Brazil
-
Minas Gerais Brazil
-
Itabira Brazil (1)
-
-
Sao Francisco Craton (1)
-
-
Colombia (1)
-
-
United States
-
Alaska
-
Brooks Range (2)
-
Prince William Sound (2)
-
Seward Peninsula (1)
-
-
Arizona (1)
-
Arkansas
-
Marion County Arkansas (1)
-
-
Arkoma Basin (2)
-
Black Warrior Basin (1)
-
California (3)
-
Colorado
-
Jefferson County Colorado
-
Schwartzwalder Mine (3)
-
-
Mineral County Colorado
-
Creede mining district (1)
-
-
Piceance Basin (1)
-
-
Colorado Plateau (3)
-
Delaware Basin (2)
-
Forest City Basin (1)
-
Great Basin (1)
-
Idaho
-
Custer County Idaho
-
Challis Idaho (1)
-
-
Lemhi County Idaho
-
Blackbird mining district (1)
-
-
-
Illinois (4)
-
Illinois Basin (1)
-
Indiana (1)
-
Iowa (2)
-
Kansas
-
Sedgwick County Kansas (1)
-
Sumner County Kansas (1)
-
-
Kentucky (2)
-
Maryland (1)
-
Michigan
-
Michigan Upper Peninsula
-
Ontonagon County Michigan
-
White Pine Michigan (1)
-
-
-
-
Midcontinent (1)
-
Midwest (1)
-
Minnesota
-
Minnesota River valley (1)
-
-
Mississippi Valley
-
Upper Mississippi Valley (3)
-
-
Missouri
-
Crawford County Missouri (1)
-
Dent County Missouri (1)
-
Iron County Missouri (1)
-
Reynolds County Missouri (1)
-
Viburnum Trend (3)
-
Washington County Missouri (1)
-
-
Montana
-
Lewis and Clark County Montana (1)
-
Park County Montana (1)
-
-
Nevada
-
Elko County Nevada (1)
-
Pershing County Nevada (1)
-
-
New Mexico
-
Grants mineral belt (2)
-
McKinley County New Mexico (2)
-
Valencia County New Mexico
-
Grants New Mexico (2)
-
-
-
New York (1)
-
North Carolina
-
Cabarrus County North Carolina (1)
-
Caldwell County North Carolina (1)
-
Davidson County North Carolina (2)
-
Montgomery County North Carolina (1)
-
Randolph County North Carolina (2)
-
Rowan County North Carolina (1)
-
Union County North Carolina (1)
-
-
Ohio (1)
-
Oklahoma (3)
-
Oregon (1)
-
Ozark Mountains (2)
-
Reelfoot Rift (2)
-
South Carolina
-
Lancaster County South Carolina (1)
-
-
South Dakota
-
Lawrence County South Dakota (1)
-
-
Texas
-
Live Oak County Texas (1)
-
Pecos County Texas (1)
-
-
Trans-Pecos (1)
-
U. S. Rocky Mountains
-
San Juan Mountains (1)
-
-
Utah
-
Bingham mining district (1)
-
-
Virginia (2)
-
West Virginia (1)
-
Western U.S. (2)
-
Wisconsin
-
Lafayette County Wisconsin (1)
-
-
Wyoming (1)
-
-
USSR (1)
-
White Pine Mine (3)
-
-
commodities
-
anhydrite deposits (1)
-
barite deposits (14)
-
bauxite deposits (1)
-
bitumens (2)
-
borate deposits (1)
-
brines (18)
-
coal deposits (1)
-
diamond deposits (1)
-
fluorspar deposits (2)
-
gems (2)
-
graphite deposits (1)
-
gypsum deposits (1)
-
industrial minerals (1)
-
metal ores
-
arsenic ores (2)
-
base metals (14)
-
cadmium ores (1)
-
cobalt ores (4)
-
copper ores (47)
-
gold ores (56)
-
IOCG deposits (1)
-
iron ores (16)
-
lead ores (34)
-
lead-zinc deposits (45)
-
magnesium ores (1)
-
manganese ores (7)
-
mercury ores (1)
-
molybdenum ores (3)
-
nickel ores (1)
-
niobium ores (1)
-
palladium ores (1)
-
platinum ores (1)
-
polymetallic ores (18)
-
pyrite ores (2)
-
rare earth deposits (1)
-
silver ores (28)
-
strontium ores (2)
-
tin ores (2)
-
tungsten ores (3)
-
uranium ores (23)
-
vanadium ores (3)
-
zinc ores (38)
-
-
mineral deposits, genesis (212)
-
mineral exploration (21)
-
mineral resources (2)
-
oil and gas fields (1)
-
petroleum
-
natural gas (2)
-
-
placers (3)
-
sulfur deposits (6)
-
tight sands (1)
-
zeolite deposits (1)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (14)
-
organic carbon (3)
-
-
chemical ratios (1)
-
halogens
-
bromine (1)
-
chlorine
-
Cl-37/Cl-35 (1)
-
-
fluorine (1)
-
iodine (1)
-
-
hydrogen
-
D/H (6)
-
deuterium (2)
-
-
isotope ratios (29)
-
isotopes
-
radioactive isotopes
-
Ar-40/Ar-39 (2)
-
Pb-206/Pb-204 (11)
-
Pb-207/Pb-204 (10)
-
Pb-208/Pb-204 (11)
-
-
stable isotopes
-
Ar-36 (1)
-
Ar-40/Ar-36 (1)
-
Ar-40/Ar-39 (2)
-
C-13/C-12 (14)
-
Cl-37/Cl-35 (1)
-
D/H (6)
-
deuterium (2)
-
Fe-56/Fe-54 (1)
-
He-4/He-3 (1)
-
Kr-84 (1)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (22)
-
Pb-206/Pb-204 (11)
-
Pb-207/Pb-204 (10)
-
Pb-207/Pb-206 (2)
-
Pb-208/Pb-204 (11)
-
Pb-208/Pb-206 (2)
-
S-34/S-32 (36)
-
Si-30/Si-28 (1)
-
Sr-87/Sr-86 (15)
-
Xe-129 (1)
-
-
-
metals
-
actinides
-
thorium (2)
-
uranium (1)
-
-
alkali metals
-
potassium (2)
-
sodium (1)
-
-
alkaline earth metals
-
calcium (2)
-
magnesium (1)
-
strontium
-
Sr-87/Sr-86 (15)
-
-
-
aluminum (1)
-
arsenic (1)
-
copper (2)
-
iron
-
Fe-56/Fe-54 (1)
-
ferric iron (1)
-
ferrous iron (2)
-
-
lead
-
Pb-206/Pb-204 (11)
-
Pb-207/Pb-204 (10)
-
Pb-207/Pb-206 (2)
-
Pb-208/Pb-204 (11)
-
Pb-208/Pb-206 (2)
-
-
molybdenum (1)
-
platinum group
-
osmium (1)
-
palladium ores (1)
-
platinum ores (1)
-
-
precious metals (5)
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
scandium (1)
-
-
rhenium (2)
-
silver (1)
-
tin (1)
-
vanadium (1)
-
zinc (1)
-
-
noble gases
-
argon
-
Ar-36 (1)
-
Ar-40/Ar-36 (1)
-
Ar-40/Ar-39 (2)
-
-
helium
-
He-4/He-3 (1)
-
-
krypton
-
Kr-84 (1)
-
-
xenon
-
Xe-129 (1)
-
-
-
nonmetals (1)
-
oxygen
-
O-18/O-16 (22)
-
-
selenium (2)
-
silicon
-
Si-30/Si-28 (1)
-
-
sulfur
-
organic sulfur (2)
-
S-34/S-32 (36)
-
-
trace metals (1)
-
-
fossils
-
Invertebrata
-
Brachiopoda
-
Articulata
-
Terebratulida (1)
-
-
-
-
-
geochronology methods
-
(U-Th)/He (1)
-
Ar/Ar (5)
-
K/Ar (4)
-
paleomagnetism (5)
-
Pb/Pb (3)
-
Rb/Sr (4)
-
Re/Os (1)
-
Sr/Sr (1)
-
thermochronology (1)
-
U/Pb (7)
-
U/Th/Pb (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
-
Tertiary
-
Catahoula Formation (1)
-
Challis Volcanics (1)
-
middle Tertiary (1)
-
Neogene
-
Miocene
-
lower Miocene (2)
-
upper Miocene
-
Messinian (1)
-
-
-
Pliocene (1)
-
upper Neogene (1)
-
-
Paleogene
-
Eocene
-
lower Eocene
-
Wind River Formation (1)
-
-
-
Oligocene
-
upper Oligocene (1)
-
-
Orca Group (1)
-
-
-
-
Dalradian (1)
-
Mesozoic
-
Cretaceous
-
Dakota Formation (1)
-
Lower Cretaceous
-
Albian (1)
-
Aptian (1)
-
-
Mancos Shale (1)
-
Upper Cretaceous (3)
-
Valdez Group (1)
-
-
Jurassic
-
Lower Jurassic
-
lower Liassic (1)
-
-
Middle Jurassic
-
Aalenian (1)
-
Bajocian (1)
-
-
Upper Jurassic
-
Brushy Basin Member (2)
-
Entrada Sandstone (1)
-
Morrison Formation (4)
-
Salt Wash Sandstone Member (1)
-
-
-
Triassic
-
Middle Triassic
-
Muschelkalk (1)
-
-
Upper Triassic (2)
-
-
-
Paleozoic
-
Cambrian
-
Acadian (1)
-
Lower Cambrian (2)
-
Mount Read Volcanics (1)
-
Upper Cambrian
-
Bonneterre Formation (4)
-
Lamotte Sandstone (1)
-
-
-
Carboniferous
-
Lower Carboniferous
-
Dinantian (3)
-
-
Mississippian
-
Upper Mississippian
-
Chesterian
-
Renault Formation (1)
-
-
Meramecian
-
Sainte Genevieve Limestone (1)
-
-
-
Windsor Group (1)
-
-
Pennsylvanian
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Hermosa Group (1)
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Middle Pennsylvanian
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Paradox Formation (1)
-
-
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Upper Carboniferous
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Westphalian (1)
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-
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Devonian
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Lower Devonian (1)
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Givetian (1)
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Marcellus Shale (1)
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Tully Limestone (1)
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Old Red Sandstone (1)
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Upper Devonian (2)
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Knox Group (1)
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lower Paleozoic (2)
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Ordovician
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Lower Ordovician (3)
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Middle Ordovician
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Decorah Shale (2)
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Everton Formation (1)
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Galena Dolomite (3)
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Platteville Formation (2)
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Skiddaw Slates (1)
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Trenton Group (1)
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Upper Ordovician
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Caradocian
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Borrowdale Volcanic Group (1)
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Trentonian (1)
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-
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Permian
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Guadalupian
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Delaware Mountain Group (1)
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Lower Permian
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Leonardian
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Bone Spring Limestone (1)
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-
-
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Silurian
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Lockport Formation (1)
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Middle Silurian (1)
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Niagaran (1)
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upper Paleozoic (1)
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Phanerozoic (1)
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Precambrian
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Kalgoorlie System (1)
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Neoarchean (1)
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Biwabik Iron Formation (1)
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Nonesuch Shale (1)
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Purcell System (1)
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upper Precambrian
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Proterozoic
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Malmani Subgroup (1)
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Mesoproterozoic
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Aldridge Formation (1)
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Belt Supergroup (2)
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Neoproterozoic
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Dengying Formation (1)
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Vendian (1)
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Paleoproterozoic
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Rooiberg Group (1)
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Urquhart Shale (1)
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Virginia Formation (1)
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Willyama Supergroup (1)
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Pretoria Group (1)
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Roan Supergroup (1)
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Sinian
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Dengying Formation (1)
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-
-
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Witwatersrand Supergroup (1)
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-
-
igneous rocks
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igneous rocks
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granophyre (1)
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kimberlite (2)
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plutonic rocks
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gabbros (1)
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granites
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aplite (1)
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I-type granites (1)
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microgranite (1)
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pegmatite (1)
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syenites
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albitite (2)
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alkali syenites (1)
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ultramafics
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chromitite (1)
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peridotites
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dunite (1)
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pyroxenite
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clinopyroxenite (1)
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-
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porphyry (1)
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volcanic rocks
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andesites (1)
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basalts
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shoshonite (1)
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glasses
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volcanic glass (1)
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pyroclastics
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ignimbrite (1)
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tuff (6)
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welded tuff (1)
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rhyolites (3)
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trachyandesites
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ophiolite (1)
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metamorphic rocks
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borates
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halides
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minerals (10)
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native elements
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phosphates
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silicates
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tobermorite (1)
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framework silicates
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alkali feldspar
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adularia (2)
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silica minerals
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zeolite group
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orthosilicates
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sorosilicates
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epidote group
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pumpellyite group
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pumpellyite (1)
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ring silicates
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sheet silicates
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clay minerals
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illite (2)
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sulfates
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tungstates
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scheelite (1)
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Primary terms
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absolute age (22)
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Africa
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Central Africa
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Congo Democratic Republic
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East Africa
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Zambia
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Kalahari Desert (2)
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Morocco
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Southern Africa
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Asia
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Far East
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Indian Peninsula
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India
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Atlantic Ocean
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Australasia
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Kambalda Australia (2)
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Norseman-Wiluna Belt (1)
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Yilgarn Craton (5)
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barite deposits (14)
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bauxite deposits (1)
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bibliography (1)
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bitumens (2)
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brines (18)
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Canada
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Meguma Terrane (1)
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Newfoundland and Labrador
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Ontario
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Quebec
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Nunavut
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Saskatchewan
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Yukon Territory
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-
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carbon
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C-13/C-12 (14)
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organic carbon (3)
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Caribbean region
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West Indies
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Dominican Republic (1)
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Cenozoic
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Quaternary
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Tertiary
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Paleogene
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lower Eocene
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Wind River Formation (1)
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Oligocene
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upper Oligocene (1)
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chemical analysis (1)
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Deep Sea Drilling Project
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Leg 23
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DSDP Site 227 (1)
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deformation (4)
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Europe
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faults (28)
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porphyry (1)
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glasses
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pyroclastics
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inclusions
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Indian Ocean
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Invertebrata
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Articulata
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isostasy (1)
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stable isotopes
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O-18/O-16 (22)
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Pb-206/Pb-204 (11)
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Pb-207/Pb-204 (10)
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Pb-207/Pb-206 (2)
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Pb-208/Pb-204 (11)
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Pb-208/Pb-206 (2)
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S-34/S-32 (36)
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Si-30/Si-28 (1)
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Sr-87/Sr-86 (15)
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Xe-129 (1)
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Mesozoic
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Cretaceous
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Mancos Shale (1)
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Jurassic
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Upper Jurassic
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Triassic
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metal ores
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Sr-87/Sr-86 (15)
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aluminum (1)
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lead
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metamorphic rocks
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gneisses
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
epigene processes
Xenotime reveals Caledonian hydrothermal overprint on Neoproterozoic Cu mineralization, East Greenland Available to Purchase
A Mississippi Valley–type Zn-Pb mineralizing system in South China constrained by in situ U-Pb dating of carbonates and barite and in situ S-Sr-Pb isotopes Available to Purchase
Diagenetic and Epigenetic Mineralizing Events in the Kalahari Copperbelt, Botswana: Evidence from Re-Os Sulfide Dating and U-Th-Pb Xenotime Geochronology Available to Purchase
Timing of fluorite mineralization and exhumation events in the east Central Alborz Mountains, northern Iran: constraints from fluorite (U–Th)/He thermochronometry Available to Purchase
Chapter 24: Muruntau, Uzbekistan: The World’s Largest Epigenetic Gold Deposit Available to Purchase
Abstract Muruntau in the Central Kyzylkum desert of the South Tien Shan, western Uzbekistan, with past production of ~3,000 metric tons (t) Au since 1967, present annual production of ~60 t Au, and large remaining resources, is the world’s largest epigenetic Au deposit. The host rocks are the mainly Cambrian-Ordovician siliciclastic flysch of the Besapan sequence. The rocks were deformed into a broadly east-west fold-and-thrust belt prior to ca. 300 Ma during ocean closure along the South Tien Shan suture. A subsequent tectonic transition was characterized by left-lateral motion on regional splays from the suture and by a massive thermal event documented by widespread 300 to 275 Ma magmatism. The Besapan rocks were subjected to middle to upper greenschist-facies regional metamorphism, an overprinting more local thermal metamorphism to produce a large hornfels aureole, and then Au-related hydrothermal activity all during early parts of the thermal event. The giant Muruntau Au deposit formed in the low-strain hornfels rocks at ca. 288 Ma at the intersection of one of the east-west splays, the Sangruntau-Tamdytau shear zone, with a NE-trending regional fault zone, the Muruntau-Daugyztau fault, which likely formed as a cross fault during the onset of left-lateral translation on the regional splays. Interaction between the two faults opened a large dilational zone along a plunging anticlinorium fold nose that served as a major site for hydrothermal fluid focusing. The Au ores are dominantly present as a series of moderately to steeply dipping quartz ± K-feldspar stockwork systems surrounding uncommon central veins and with widespread lower Au-grade metasomatites (i.e., disseminated ores). Pervasive alteration is biotite-K-feldspar, although locally albitization is dominant. Sulfides are mainly arsenopyrite, pyrite, and lesser pyrrhotite, and scheelite may be present both in preore ductile veins and in the more brittle auriferous stockwork systems. The low-salinity, aqueous-carbonic ore-forming fluids probably deposited the bulk of the ore at 400 ° ± 50 ° C and 6-to 10-km paleodepth. The genesis of the deposit remains controversial with metamorphic, thermal aureole gold (TAG), and models related to mantle upwelling all having been suggested in recent years. More importantly, the question as to why there was such a focusing of so much Au and fluid into this one location, forming an ore system an order of magnitude larger than other giant Au deposits in metamorphic terranes, remains unresolved.
The Carboniferous Shikebutai Iron Deposit in Western Tianshan, Northwestern China: Petrology, Fe-O-C-Si Isotopes, and Implications for Iron Pathways Available to Purchase
Sediment Hosted Stratiform Copper (SSC) Mineralization in Bhudoli-Basari Area, North Delhi Fold Belt, Mesoproterozoic Delhi Supergroup, Rajasthan Available to Purchase
How Precisely Can the Temperature of a Fluid Event be Constrained Using Fluid Inclusions? Open Access
Multi-stage pyrite genesis and epigenetic selenium enrichment of Greenburn coals (East Ayrshire) Open Access
Geochemistry of the barite deposits near Adana-Feke area (Eastern Taurides) Available to Purchase
Hydrothermal Fluid Origins of Carbonate-Hosted Pb-Zn Deposits of the Sanjiang Thrust Belt, Tibet: Indications from Noble Gases and Halogens Available to Purchase
Resource Potential for Commodities in Addition to Uranium in Sandstone-Hosted Deposits Available to Purchase
Abstract Sandstone-hosted deposits mined primarily for their uranium content also have been a source of vanadium and modest amounts of copper. Processing of these ores has also recovered small amounts of molybdenum, rhenium, rare earth elements, scandium, and selenium. These deposits share a generally common origin, but variations in the source of metals, composition of ore-forming solutions, and geologic history result in complex variability in deposit composition. This heterogeneity is evident regionally within the same host rock, as well as within districts. Future recovery of elements associated with uranium in these deposits will be strongly dependent on mining and ore-processing methods.