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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Arctic Ocean
-
Alpha Cordillera (1)
-
Amerasia Basin (3)
-
Beaufort Sea (4)
-
Canada Basin (5)
-
Chukchi Sea (3)
-
Lomonosov Ridge (2)
-
Makarov Basin (1)
-
Mid-Arctic Ocean Ridge (1)
-
-
Arctic region
-
Arctic Coastal Plain (2)
-
Greenland
-
East Greenland (1)
-
-
North Pole (1)
-
Russian Arctic
-
Novaya Zemlya (1)
-
-
Svalbard (1)
-
-
Asia
-
Brahmaputra River (1)
-
Central Asia
-
Kazakhstan (1)
-
-
Chukotka Russian Federation
-
Chukchi Peninsula (2)
-
-
Far East
-
Japan (1)
-
-
Indian Peninsula
-
Bangladesh (1)
-
-
Irtysh River (1)
-
Kolyma Uplift (1)
-
Krasnoyarsk Russian Federation
-
Taymyr Dolgan-Nenets Russian Federation
-
Taymyr Peninsula (1)
-
-
-
Omolon River (1)
-
Siberia (1)
-
Yakutia Russian Federation
-
Verkhoyansk Range (1)
-
-
-
Atlantic Ocean
-
North Atlantic (1)
-
-
Atlantic Ocean Islands
-
South Sandwich Islands (1)
-
-
Australasia
-
Australia
-
Queensland Australia
-
Century Deposit (1)
-
-
-
New Zealand (1)
-
-
Bear Mountain (1)
-
Bering Strait (1)
-
Caledonides (1)
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Canada
-
Arctic Archipelago (2)
-
Nunavut
-
Ellesmere Island (1)
-
Sverdrup Basin (1)
-
-
Queen Elizabeth Islands
-
Ellesmere Island (1)
-
Sverdrup Basin (1)
-
-
Western Canada
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Canadian Cordillera (2)
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Northwest Territories (3)
-
Yukon Territory (7)
-
-
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Colville River (2)
-
Commonwealth of Independent States
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Kazakhstan (1)
-
Russian Federation
-
Arkhangelsk Russian Federation
-
Novaya Zemlya (1)
-
-
Chukotka Russian Federation
-
Chukchi Peninsula (2)
-
-
Kolyma Uplift (1)
-
Krasnoyarsk Russian Federation
-
Taymyr Dolgan-Nenets Russian Federation
-
Taymyr Peninsula (1)
-
-
-
Omolon River (1)
-
Russian Arctic
-
Novaya Zemlya (1)
-
-
Yakutia Russian Federation
-
Verkhoyansk Range (1)
-
-
-
Urals
-
Novaya Zemlya (1)
-
-
-
Cook Inlet (1)
-
Eurasia (1)
-
Europe
-
Alps
-
Eastern Alps (1)
-
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Arkhangelsk Russian Federation
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Novaya Zemlya (1)
-
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Carpathians (1)
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Western Europe
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Scandinavia
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Denmark (1)
-
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United Kingdom
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Great Britain
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England
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Devon England (1)
-
-
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-
-
Franklin Mountains (2)
-
Kaltag Fault (1)
-
North America
-
Appalachians (1)
-
Canadian Shield (1)
-
Denali Fault (1)
-
North American Cordillera
-
Canadian Cordillera (2)
-
-
Rocky Mountains (1)
-
Williston Basin (1)
-
Yakutat Terrane (1)
-
Yukon-Tanana Upland (2)
-
-
North Slope (42)
-
Pacific Coast (1)
-
Pacific Ocean
-
East Pacific
-
Northeast Pacific
-
Hess Deep (1)
-
-
-
North Pacific
-
Bering Sea
-
Aleutian Basin (1)
-
-
Northeast Pacific
-
Hess Deep (1)
-
-
Northwest Pacific
-
Izu-Bonin Arc (1)
-
-
-
West Pacific
-
Northwest Pacific
-
Izu-Bonin Arc (1)
-
-
-
-
polar regions (2)
-
Red Dog Mine (19)
-
Scotia Sea Islands
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South Sandwich Islands (1)
-
-
Searles Lake (1)
-
South America
-
Argentina (2)
-
Brazil (1)
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Parana River (1)
-
-
Taranaki Basin (1)
-
United States
-
Alaska
-
Alaska Peninsula (2)
-
Alaska Range (2)
-
Aleutian Islands (2)
-
Ambler River Quadrangle (1)
-
Arctic National Wildlife Refuge (6)
-
Baird Mountains Quadrangle (2)
-
Brooks Range
-
De Long Mountains (9)
-
Endicott Mountains (7)
-
Sadlerochit Mountains (5)
-
-
Chandalar Quadrangle (1)
-
Demarcation Point Quadrangle (2)
-
Howard Pass Quadrangle (1)
-
Killik River Quadrangle (1)
-
Mount Michelson Quadrangle (2)
-
National Petroleum Reserve Alaska (26)
-
Prudhoe Bay (2)
-
Prudhoe Bay Field (2)
-
Seward Peninsula (4)
-
Trans-Alaska Pipeline (1)
-
Umiat Field (2)
-
Wiseman Quadrangle (1)
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Yukon-Koyukuk Basin (3)
-
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California (2)
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Michigan (1)
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New York
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Schoharie County New York (1)
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Pennsylvania (1)
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Utah (1)
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Washington
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Pacific County Washington
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Willapa Bay (1)
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Western U.S. (2)
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USSR (1)
-
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commodities
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barite deposits (17)
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energy sources (4)
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metal ores
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base metals (4)
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copper ores (6)
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gold ores (2)
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lead ores (20)
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lead-zinc deposits (11)
-
molybdenum ores (1)
-
polymetallic ores (18)
-
silver ores (23)
-
tin ores (1)
-
tungsten ores (1)
-
zinc ores (21)
-
-
mineral deposits, genesis (29)
-
mineral exploration (9)
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oil and gas fields (5)
-
petroleum
-
natural gas (7)
-
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (10)
-
C-14 (10)
-
organic carbon (3)
-
-
chemical ratios (2)
-
isotope ratios (19)
-
isotopes
-
radioactive isotopes
-
Al-26 (1)
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Be-10 (2)
-
C-14 (10)
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Re-187/Os-188 (1)
-
-
stable isotopes
-
C-13/C-12 (10)
-
Hf-177/Hf-176 (1)
-
N-15/N-14 (1)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (11)
-
Os-188/Os-187 (2)
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (1)
-
Pb-207/Pb-206 (3)
-
Pb-208/Pb-204 (1)
-
Re-187/Os-188 (1)
-
S-34/S-32 (6)
-
Sr-87 (1)
-
Sr-87/Sr-86 (7)
-
-
-
Lu/Hf (5)
-
metals
-
actinides
-
thorium (1)
-
uranium (1)
-
-
alkaline earth metals
-
barium (1)
-
beryllium
-
Be-10 (2)
-
-
magnesium (1)
-
strontium
-
Sr-87 (1)
-
Sr-87/Sr-86 (7)
-
-
-
aluminum
-
Al-26 (1)
-
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
iron (1)
-
lead
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (1)
-
Pb-207/Pb-206 (3)
-
Pb-208/Pb-204 (1)
-
-
molybdenum (1)
-
platinum group
-
osmium
-
Os-188/Os-187 (2)
-
Re-187/Os-188 (1)
-
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
rhenium
-
Re-187/Os-188 (1)
-
-
thallium (1)
-
titanium (1)
-
-
nitrogen
-
N-15/N-14 (1)
-
-
noble gases
-
helium (1)
-
-
oxygen
-
O-18/O-16 (11)
-
-
sulfur
-
S-34/S-32 (6)
-
-
-
fossils
-
Chordata
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Vertebrata
-
Tetrapoda
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Mammalia
-
Theria
-
Eutheria
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Carnivora
-
Fissipeda (1)
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-
-
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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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-
-
Graptolithina (2)
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ichnofossils (2)
-
Invertebrata
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Arthropoda
-
Mandibulata
-
Insecta (1)
-
-
Trilobitomorpha
-
Trilobita
-
Agnostida (1)
-
Ptychopariida (1)
-
-
-
-
Brachiopoda
-
Articulata
-
Pentamerida (1)
-
-
Inarticulata (1)
-
-
Bryozoa (1)
-
Cnidaria
-
Anthozoa (2)
-
-
Echinodermata (1)
-
Mollusca
-
Bivalvia (2)
-
Cephalopoda
-
Ammonoidea
-
Ammonites (1)
-
-
-
-
Protista
-
Foraminifera
-
Fusulinina
-
Fusulinidae (1)
-
-
Rotaliina
-
Rotaliacea
-
Elphidium
-
Elphidium excavatum (1)
-
-
-
-
-
Radiolaria (4)
-
-
Vermes
-
Annelida (1)
-
-
-
microfossils
-
Conodonta (8)
-
Fusulinina
-
Fusulinidae (1)
-
-
-
palynomorphs
-
Dinoflagellata (1)
-
miospores
-
pollen (3)
-
-
-
Plantae
-
algae (1)
-
Spermatophyta
-
Angiospermae (1)
-
Gymnospermae
-
Coniferales (1)
-
-
-
-
-
geochronology methods
-
(U-Th)/He (1)
-
Ar/Ar (9)
-
exposure age (2)
-
fission-track dating (5)
-
K/Ar (4)
-
lichenometry (1)
-
Lu/Hf (5)
-
Nd/Nd (2)
-
paleomagnetism (3)
-
Pb/Pb (2)
-
Rb/Sr (1)
-
Re/Os (2)
-
Sm/Nd (1)
-
tephrochronology (2)
-
thermochronology (2)
-
thermoluminescence (1)
-
tree rings (1)
-
U/Pb (17)
-
U/Th/Pb (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene
-
Neoglacial (1)
-
upper Holocene (1)
-
-
Pleistocene
-
Illinoian (1)
-
upper Pleistocene
-
Wisconsinan
-
upper Wisconsinan (1)
-
-
-
-
upper Quaternary (4)
-
-
Tertiary
-
Neogene (1)
-
Paleogene
-
Eocene (1)
-
Paleocene (1)
-
-
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Albian
-
upper Albian (1)
-
-
Aptian (1)
-
Neocomian (3)
-
Pebble Shale (1)
-
Torok Formation (3)
-
Valanginian (2)
-
-
Middle Cretaceous (1)
-
Nanushuk Group (10)
-
Upper Cretaceous
-
Campanian (1)
-
Cenomanian (3)
-
Colville Group (5)
-
Maestrichtian (1)
-
Prince Creek Formation (3)
-
Santonian (1)
-
Schrader Bluff Formation (1)
-
-
-
Jurassic
-
Kingak Shale (4)
-
Middle Jurassic (1)
-
Upper Jurassic
-
Oxfordian (1)
-
-
-
lower Mesozoic (1)
-
Triassic
-
Middle Triassic (1)
-
Shublik Formation (7)
-
Upper Triassic (2)
-
-
-
Paleozoic
-
Cambrian
-
Middle Cambrian (1)
-
Upper Cambrian
-
Furongian (1)
-
-
-
Carboniferous
-
Lower Carboniferous
-
Dinantian (1)
-
-
Mississippian
-
Lower Mississippian
-
Kayak Shale (8)
-
Kekiktuk Conglomerate (4)
-
Osagian (1)
-
Tournaisian (1)
-
-
Middle Mississippian
-
Visean (1)
-
-
Upper Mississippian
-
Chesterian (1)
-
Meramecian (1)
-
-
-
Pennsylvanian
-
Middle Pennsylvanian (1)
-
-
Wahoo Limestone (3)
-
-
Devonian
-
Lower Devonian
-
Oriskany Sandstone (1)
-
-
Middle Devonian
-
Eifelian (1)
-
Givetian (1)
-
-
Upper Devonian
-
Kanayut Conglomerate (4)
-
-
-
Endicott Group (1)
-
Lisburne Group (22)
-
lower Paleozoic (4)
-
middle Paleozoic (2)
-
Ordovician
-
Lower Ordovician (1)
-
Middle Ordovician
-
Darriwilian (1)
-
-
Upper Ordovician
-
Katian (1)
-
-
-
Permian
-
Echooka Formation (1)
-
Lower Permian
-
Wolfcampian (1)
-
-
-
Silurian (2)
-
upper Paleozoic (3)
-
-
Phanerozoic (1)
-
Precambrian
-
Archean
-
Neoarchean (1)
-
-
upper Precambrian
-
Proterozoic
-
Neoproterozoic
-
Ediacaran (1)
-
Tonian (1)
-
Vendian (1)
-
-
-
-
-
-
igneous rocks
-
igneous rocks
-
plutonic rocks
-
diorites (1)
-
gabbros (6)
-
granites (1)
-
monzonites (1)
-
ultramafics (7)
-
-
volcanic rocks
-
basalts
-
flood basalts (1)
-
mid-ocean ridge basalts (2)
-
tholeiite (1)
-
-
-
-
ophiolite (7)
-
-
metamorphic rocks
-
metamorphic rocks
-
gneisses
-
granite gneiss (1)
-
-
hornfels (1)
-
marbles (1)
-
metaigneous rocks (3)
-
metaplutonic rocks (1)
-
metasedimentary rocks
-
metagraywacke (1)
-
-
metasomatic rocks
-
greisen (1)
-
skarn (1)
-
-
metavolcanic rocks (4)
-
phyllites (1)
-
schists (1)
-
-
ophiolite (7)
-
turbidite (3)
-
-
minerals
-
carbonates
-
calcite (1)
-
dolomite (1)
-
siderite (2)
-
-
minerals (2)
-
oxides
-
iron oxides (2)
-
magnetite (1)
-
-
phosphates
-
apatite (3)
-
-
silicates
-
chain silicates
-
amphibole group
-
clinoamphibole
-
actinolite (1)
-
glaucophane (1)
-
hornblende (2)
-
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
orthoclase (1)
-
-
-
silica minerals
-
chalcedony (1)
-
quartz (3)
-
-
zeolite group
-
analcime (1)
-
phillipsite (1)
-
-
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (15)
-
-
-
-
sheet silicates
-
chlorite group
-
chlorite (1)
-
-
clay minerals
-
kaolinite (2)
-
smectite (3)
-
-
cymrite (1)
-
illite (2)
-
mica group
-
muscovite (2)
-
-
-
-
sulfates
-
barite (3)
-
-
sulfides
-
bornite (2)
-
chalcopyrite (2)
-
galena (2)
-
pyrite (4)
-
sphalerite (5)
-
-
tungstates
-
ferberite (1)
-
wolframite (1)
-
-
-
Primary terms
-
absolute age (43)
-
Arctic Ocean
-
Alpha Cordillera (1)
-
Amerasia Basin (3)
-
Beaufort Sea (4)
-
Canada Basin (5)
-
Chukchi Sea (3)
-
Lomonosov Ridge (2)
-
Makarov Basin (1)
-
Mid-Arctic Ocean Ridge (1)
-
-
Arctic region
-
Arctic Coastal Plain (2)
-
Greenland
-
East Greenland (1)
-
-
North Pole (1)
-
Russian Arctic
-
Novaya Zemlya (1)
-
-
Svalbard (1)
-
-
Asia
-
Brahmaputra River (1)
-
Central Asia
-
Kazakhstan (1)
-
-
Chukotka Russian Federation
-
Chukchi Peninsula (2)
-
-
Far East
-
Japan (1)
-
-
Indian Peninsula
-
Bangladesh (1)
-
-
Irtysh River (1)
-
Kolyma Uplift (1)
-
Krasnoyarsk Russian Federation
-
Taymyr Dolgan-Nenets Russian Federation
-
Taymyr Peninsula (1)
-
-
-
Omolon River (1)
-
Siberia (1)
-
Yakutia Russian Federation
-
Verkhoyansk Range (1)
-
-
-
Atlantic Ocean
-
North Atlantic (1)
-
-
Atlantic Ocean Islands
-
South Sandwich Islands (1)
-
-
Australasia
-
Australia
-
Queensland Australia
-
Century Deposit (1)
-
-
-
New Zealand (1)
-
-
barite deposits (17)
-
biogeography (6)
-
Canada
-
Arctic Archipelago (2)
-
Nunavut
-
Ellesmere Island (1)
-
Sverdrup Basin (1)
-
-
Queen Elizabeth Islands
-
Ellesmere Island (1)
-
Sverdrup Basin (1)
-
-
Western Canada
-
Canadian Cordillera (2)
-
Northwest Territories (3)
-
Yukon Territory (7)
-
-
-
carbon
-
C-13/C-12 (10)
-
C-14 (10)
-
organic carbon (3)
-
-
Cenozoic
-
Quaternary
-
Holocene
-
Neoglacial (1)
-
upper Holocene (1)
-
-
Pleistocene
-
Illinoian (1)
-
upper Pleistocene
-
Wisconsinan
-
upper Wisconsinan (1)
-
-
-
-
upper Quaternary (4)
-
-
Tertiary
-
Neogene (1)
-
Paleogene
-
Eocene (1)
-
Paleocene (1)
-
-
-
-
Chordata
-
Vertebrata
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Carnivora
-
Fissipeda (1)
-
-
-
-
-
Reptilia
-
Diapsida
-
Archosauria
-
dinosaurs (1)
-
-
-
-
-
-
-
clay mineralogy (4)
-
climate change (1)
-
continental shelf (2)
-
crust (10)
-
data processing (3)
-
deformation (20)
-
diagenesis (14)
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earthquakes (3)
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ecology (1)
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economic geology (23)
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energy sources (4)
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Eurasia (1)
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Europe
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Alps
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Eastern Alps (1)
-
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Arkhangelsk Russian Federation
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Novaya Zemlya (1)
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Carpathians (1)
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Western Europe
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Scandinavia
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Denmark (1)
-
-
United Kingdom
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Great Britain
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England
-
Devon England (1)
-
-
-
-
-
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Detrital zircon ages from upper Paleozoic–Triassic clastic strata on St. Lawrence Island, Alaska: An enigmatic component of the Arctic Alaska–Chukotka microplate
Diagenetic Controls on the Formation of the Anarraaq Clastic-Dominated Zn-Pb-Ag Deposit, Red Dog District, Alaska
Ulungarat Basin: Record of a major Middle Devonian to Mississippian syn-rift to post-rift tectonic transition, eastern Brooks Range, Arctic Alaska
Linking rivers to the rock record: Channel patterns and paleocurrent circular variance
Pre-Mississippian Stratigraphic Architecture of the Porcupine Shear Zone, Yukon and Alaska, and Significance in the Evolution of Northern Laurentia
Tectonochemistry of the Brooks Range Ophiolite, Alaska
Late Ordovician brachiopods from east-central Alaska, northwestern margin of Laurentia
Seismic attribute and petrophysics-assisted interpretation of the Nanushuk and Torok Formations on the North Slope, Alaska
Surface to subsurface correlation of the Middle-Upper Triassic Shublik Formation within a revised sequence stratigraphic framework
Organic-rich microfossils produced by oil infiltration of hollow silicified bacteria: Evidence from the ca. 340 Ma Red Dog Zn-Pb deposit, Alaska
ABSTRACT The Neoproterozoic–Early Devonian platformal succession of the North Slope subterrane, northeastern Brooks Range, Alaska, represents a carbonate-dominated peri-Laurentian continental fragment within the composite Arctic Alaska–Chukotka microplate. The basal ca. 760–720 Ma Mount Weller Group consists of an ~400 m thick mixed siliciclastic and carbonate succession that records the onset of regional extensional tectonism associated with the separation of southeastern Siberia from northern Laurentia during the break-up of Rodinia. These strata are overlain by ca. 720 Ma continental flood basalts of the Kikiktat volcanic rocks, which provide a link between the northeast Brooks Range platformal succession and the ca. 723–717 Ma Franklin large igneous province (LIP) of northern Laurentia. The overlying Sturtian Hula Hula diamictite and Cryogenian–Ediacaran Katakturuk Dolomite record abbreviated thermal subsidence of the northeast Brooks Range platformal succession prior to renewed Ediacaran–early Cambrian extensional tectonism and deposition of the overlying lower Paleozoic Nanook Group (new name). Equivalent strata of the deep-water Cryogenian–lower Cambrian(?) Ikiakpuk Group (new name) are identified herein with new δ 13 C carb and 87 Sr/ 86 Sr isotopic data from the Fourth Range of the northeastern Brooks Range. The Nanook Group is formally divided herein into the Black Dog and Sunset Pass formations, which record isolated peri-Laurentian platformal carbonate sedimentation along the northern margin of Laurentia, in an analogous tectonic position to the modern Bahama Banks. A profound Late Ordovician(?)-Early Devonian unconformity within the platformal succession is marked by subaerial exposure, paleokarst development, and tilting of the northeast Brooks Range peri-Laurentian platformal fragment prior to deposition of the overlying Lower Devonian Mount Copleston Limestone.
ABSTRACT The Neoproterozoic–Early Devonian(?) northeast Brooks Range basinal succession of northern Alaska and Yukon represents a peri-Laurentian deep-marine carbonate and siliciclastic succession within the composite Arctic Alaska–Chukotka microplate. The basal Firth River Group consists of a mixed siliciclastic and carbonate succession that is divided into the informal Redwacke Creek, Malcolm River, and Fish Creek formations. New U-Pb detrital zircon geochronology and δ 13 C carb and 87 Sr/ 86 Sr isotopic data from these strata, in combination with previously reported and new trace fossil discoveries, suggest the Firth River Group is Cryogenian(?)–middle(?) Cambrian in age. These strata interfinger with or are depositionally overlain by the siliciclastic-dominated lower Cambrian–Middle Ordovician(?) Neruokpuk and Leffingwell (new name) formations, which potentially record a distal expression of Cambrian extension and condensed passive margin sedimentation along the northern margin of Laurentia. All of these units are unconformably overlain by the synorogenic Clarence River Group, which is divided into the informal Aichilik and Buckland Hills formations. New U-Pb detrital zircon geochronology and previous macrofossil collections suggest the Clarence River Group is Late Ordovician-Early Devonian(?) in age. Here, we present new sedimentological observations, stratigraphic subdivisions, detrital zircon U-Pb geochronology and Lu-Hf isotope geochemistry, detrital muscovite 40 Ar/ 39 Ar geochronology, and carbonate δ 13 C carb and 87 Sr/ 86 Sr isotope geochemistry from the basinal succession that revise previous tectono-stratigraphic models for this part of Arctic Alaska and support correlations with age-equivalent strata in the Franklinian basin of the Canadian Arctic Islands and Greenland.
ABSTRACT The North Slope subterrane of Arctic Alaska extends from the northeastern Brooks Range of Alaska into adjacent Yukon, Canada, and includes a pre-Mississippian deep-water sedimentary succession that has been historically correlated with units exposed in the Selwyn basin of northwestern Laurentia. Sedimentary provenance data, including Sm-Nd isotopes and major and trace element geochemistry, provide detailed geochemical characterization of the regional pre-Mississippian strata of the North Slope subterrane. Combined with paleontological and geochronological age constraints, these new data record a marked shift in provenance in the Ordovician–Devonian(?) Clarence River Group, evidently linked to an influx of juvenile, arc-derived material. The timing and nature of this provenance change are consistent with early Paleozoic tectonic reconstructions of the Arctic margin that restore the North Slope subterrane to northeastern Laurentia (present coordinates), proximal to the Appalachian-Caledonian orogenic belt. Such a restoration requires significant post-Early Devonian sinistral strike-slip displacement to later incorporate the North Slope subterrane into the composite Arctic Alaska terrane.
ABSTRACT The Whale Mountain allochthon is a structural complex composed of lower Paleozoic mafic volcanic and marine sedimentary rocks that are exposed within three fault-bounded, east–west-trending belts in the northeastern Brooks Range of Alaska and Yukon. Each belt is characterized by a unique structural and stratigraphic architecture. Trace-element systematics from the volcanic rocks define distinctive suites that are geographically restricted to each belt. The volcanic rocks of the southern belt (the Marsh Fork volcanic rocks) have a tholeiitic character and rare earth element trends that resemble modern mid-ocean-ridge basalt. The volcanic rocks of the central belt (the Whale Mountain volcanic rocks) and northern belt (Ekaluakat formation; new name) both have an alkaline character, but the northern belt rocks are significantly more enriched in the incompatible trace elements. New zircon U-Pb data from two volcaniclastic rock units, one from the southern belt and another from central belt, yield unimodal age populations that range from ca. 567 to 474 Ma, with weighted averages of 504 ± 11 and 512 ± 1.4 Ma for each sample. In the central and southern belts of the allochthon, basalt flows are interbedded with discontinuous limestone and dolostone units that contain trilobites and agnostoid arthropods. Three distinct trilobite faunas of late Cambrian (Furongian) age were recovered from widely separated localities. The scarcity of uniquely Laurentian genera, coupled with an abundance of distinctive species that could not be assigned to any established Furongian genus, argues against models that invoke extrusion of these volcanic rocks onto the autochthonous Laurentian shelf or slope. It is thus proposed that the Whale Mountain allochthon formed in a peri-Laurentian setting, possibly as disparate fragments of the northern Iapetus Ocean that were assembled in an ancient accretionary wedge and subsequently accreted to the northern margin of Laurentia during the early Paleozoic.
U-Pb and oxygen isotope characteristics of Timanian- and Caledonian-age detrital zircons from the Brooks Range, Arctic Alaska, USA
Sedimentary magnetic anomalies: Part 1 — The validity of short-wavelength, low-amplitude SEDMAG anomalies
A revised Triassic stratigraphic framework for the Arctic Alaska Basin
Multiscale crustal architecture of Alaska inferred from P receiver functions
Abstract Mid-Palaeozoic assembly models for the Arctic Alaska–Chukotka microplate predict the presence of cryptic crustal sutures, the exact locations and deformational histories of which have not been identified in the field. This study presents data on the provenance of polydeformed and metamorphosed strata in the southern Brooks Range Schist Belt and Central Belt of presumed Proterozoic–Devonian depositional age, as well as for the structurally overlying strata, to help elucidate terrane boundaries within the Arctic Alaska–Chukotka microplate and to add new constraints to the palaeogeographical evolution of its constituent parts. The protoliths identified support correlations with metasedimentary strata in the Ruby terrane and Seward Peninsula and suggest a (peri-) Baltican origin in late Neoproterozoic–early Palaeozoic time. Proximity to Laurentia is only evident in what are inferred to be post-early Devonian age strata. By contrast, the North Slope and Apoon terranes originated proximal to Laurentia. The mid-Palaeozoic boundary between these (peri-) Baltican and (peri-) Laurentian terranes once lay between rocks of the Schist/Central belts and those of the Apoon terrane, but is obscured by severe Mesozoic–Cenozoic deformation. Whether this boundary represents a convergent or transform suture, when exactly it formed and how it relates to broader Caledonian convergence in the North Atlantic are still unresolved questions. Supplementary material: Details of the analytical methods together with zircon U-Pb and Lu-Hf isotopic data tables are available at https://doi.org/10.6084/m9.figshare.c.3805696