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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
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Central Africa
-
Gabon
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Oklo (1)
-
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Nubian Shield (1)
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Southern Africa
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Botswana (1)
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Kaapvaal Craton (5)
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Kalahari Craton (1)
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Karoo Basin (1)
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Namibia (2)
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South Africa
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Bushveld Complex (1)
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Free State South Africa
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Vredefort Dome (1)
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Klerksdorp Field (1)
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Murchison greenstone belt (1)
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Transvaal region (3)
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Witwatersrand (10)
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Antarctica
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Victoria Land (1)
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Asia
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Central Asia
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Kazakhstan
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Far East
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China
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Himalayas
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Trans-Aravalli Vindhyan Basin (1)
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Krasnoyarsk Russian Federation
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Middle East
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elements, isotopes
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carbon
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organic carbon (1)
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chemical ratios (2)
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halogens
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hydrogen
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isotope ratios (32)
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radioactive isotopes
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (2)
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U-238/Th-232 (1)
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stable isotopes
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C-13 (1)
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C-13/C-12 (8)
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D/H (4)
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deuterium (1)
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Fe-56/Fe-54 (1)
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Fe-57/Fe-54 (1)
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Hf-177/Hf-176 (3)
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N-15/N-14 (1)
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Nd-144/Nd-143 (3)
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O-17/O-16 (1)
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O-18/O-16 (13)
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Os-188/Os-187 (2)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (2)
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Pb-207/Pb-206 (1)
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S-33/S-32 (1)
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S-34/S-32 (9)
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Sr-87/Sr-86 (4)
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Lu/Hf (1)
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metals
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uranium
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alkaline earth metals
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Sr-87/Sr-86 (4)
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arsenic (1)
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gold (1)
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hafnium
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Hf-177/Hf-176 (3)
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iron
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Fe-56/Fe-54 (1)
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ferric iron (2)
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ferrous iron (1)
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lead
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (2)
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Pb-207/Pb-206 (1)
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platinum ores (22)
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precious metals (5)
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Nd-144/Nd-143 (3)
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yttrium (1)
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rhenium (1)
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nitrogen
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N-15/N-14 (1)
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oxygen
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O-17/O-16 (1)
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O-18/O-16 (13)
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phosphorus (1)
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sulfur
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S-33/S-32 (1)
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S-34/S-32 (9)
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trace metals (3)
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fossils
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cyanobacteria (1)
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geochronology methods
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paleomagnetism (1)
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Pb/Pb (6)
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U/Pb (30)
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uranium disequilibrium (1)
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geologic age
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Cenozoic
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Quaternary
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Holocene (2)
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Tertiary
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Paleogene
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Oligocene
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Frio Formation (1)
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Laurentide ice sheet (1)
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Mesozoic
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Cretaceous (1)
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Middle Triassic (1)
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Paleozoic
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Cambrian
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Lower Cambrian (2)
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Upper Cambrian
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Mount Simon Sandstone (1)
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Carboniferous (1)
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Devonian
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Lower Devonian (1)
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lower Paleozoic (1)
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Ordovician
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Middle Ordovician
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Upper Ordovician (1)
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Permian
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Phosphoria Formation (1)
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Upper Permian
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Permian-Triassic boundary (1)
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Silurian (1)
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Weber Sandstone (1)
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Phanerozoic (3)
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Precambrian
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Archean
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Mesoarchean (2)
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Neoarchean (9)
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Timiskaming Group (1)
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Yellowknife Group (1)
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Central Rand Group (2)
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Fortescue Group (1)
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Hadean (1)
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Levack Gneiss (3)
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Missi Group (1)
-
Nipissing Diabase (6)
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Transvaal Supergroup (4)
-
upper Precambrian
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Proterozoic
-
Algonkian
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Baraboo Quartzite (3)
-
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Great Oxidation Event (2)
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Huronian
-
Gowganda Formation (3)
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Onaping Formation (2)
-
Signal Hill Formation (1)
-
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Hutuo Group (1)
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Keweenawan
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Copper Harbor Conglomerate (1)
-
-
Lewisian (1)
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Mesoproterozoic
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Freda Sandstone (1)
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Helikian (1)
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Shuangqiaoshan Group (1)
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Neoproterozoic
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Blaini Formation (1)
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Cryogenian (2)
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Marinoan (1)
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Sturtian (1)
-
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Oronto Group (1)
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Paleoproterozoic
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Aphebian
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Hurwitz Group (1)
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Chelmsford Formation (1)
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Cobalt Group (1)
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Whitewater Group (2)
-
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Ventersdorp Supergroup (1)
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Witwatersrand Supergroup (5)
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igneous rocks
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igneous rocks
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carbonatites (1)
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plutonic rocks
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diabase (4)
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gabbros
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norite (3)
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granites
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A-type granites (1)
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monzogranite (2)
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granodiorites (2)
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spinel lherzolite (1)
-
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volcanic rocks
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basalts
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flood basalts (2)
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mid-ocean ridge basalts (1)
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tholeiitic basalt (1)
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dacites (1)
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komatiite (4)
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rhyodacites (1)
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rhyolites (1)
-
-
-
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metamorphic rocks
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metamorphic rocks
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amphibolites (3)
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gneisses (8)
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granulites (2)
-
impactites
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impact breccia (1)
-
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metaigneous rocks
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metabasalt (1)
-
-
metasedimentary rocks (7)
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metavolcanic rocks (1)
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migmatites (1)
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mylonites
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pseudotachylite (2)
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quartzites (3)
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schists
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greenschist (1)
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slates (1)
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meteorites
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meteorites
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stony meteorites
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achondrites (1)
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chondrites
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carbonaceous chondrites (1)
-
ordinary chondrites
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H chondrites
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Tieschitz Meteorite (1)
-
-
-
-
-
-
-
minerals
-
alloys (1)
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arsenates (1)
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arsenides
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gersdorffite (2)
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sperrylite (2)
-
-
bismuthides
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froodite (1)
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michenerite (1)
-
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carbonates
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aragonite (1)
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calcite (2)
-
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halides
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chlorides
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halite (1)
-
-
-
minerals (4)
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native elements
-
graphite (1)
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organic minerals (1)
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oxides
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baddeleyite (2)
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brannerite (1)
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chromite (1)
-
hydroxides
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oxyhydroxides (1)
-
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ilmenite (1)
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magnetite (3)
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niobates
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columbite (1)
-
-
perovskite (1)
-
pitchblende (1)
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thorianite (1)
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uraninite (5)
-
-
phosphates
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apatite (2)
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fluorapatite (2)
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monazite (3)
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rhabdophane (1)
-
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platinum minerals (3)
-
silicates
-
chain silicates
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amphibole group
-
clinoamphibole
-
actinolite (2)
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hornblende (2)
-
-
-
prehnite (1)
-
pyroxene group
-
clinopyroxene (1)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (2)
-
-
plagioclase
-
albite (2)
-
-
-
silica minerals
-
quartz (5)
-
-
-
orthosilicates
-
nesosilicates
-
olivine group
-
olivine (1)
-
-
titanite group
-
titanite (2)
-
-
zircon group
-
coffinite (1)
-
thorite (2)
-
zircon (15)
-
-
-
sorosilicates
-
epidote group
-
allanite (1)
-
-
-
-
ring silicates
-
tourmaline group (2)
-
-
sheet silicates
-
chlorite group
-
chlorite (6)
-
-
clay minerals
-
halloysite (1)
-
kaolinite (2)
-
smectite (1)
-
vermiculite (1)
-
-
illite (2)
-
mica group
-
biotite (2)
-
muscovite (2)
-
phlogopite (1)
-
-
pyrophyllite (1)
-
sericite (1)
-
-
-
sulfates (1)
-
sulfides
-
chalcocite (1)
-
chalcopyrite (7)
-
cinnabar (1)
-
copper sulfides (1)
-
cubanite (1)
-
galena (1)
-
gersdorffite (2)
-
marcasite (1)
-
millerite (2)
-
nickel sulfides (1)
-
pentlandite (5)
-
pyrite (9)
-
pyrrhotite (5)
-
-
sulfosalts (1)
-
tellurides
-
coloradoite (1)
-
-
uranium minerals (2)
-
-
Primary terms
-
absolute age (38)
-
Africa
-
Central Africa
-
Gabon
-
Oklo (1)
-
-
-
Nubian Shield (1)
-
Southern Africa
-
Botswana (1)
-
Kaapvaal Craton (5)
-
Kalahari Craton (1)
-
Karoo Basin (1)
-
Namibia (2)
-
South Africa
-
Bushveld Complex (1)
-
Free State South Africa
-
Vredefort Dome (1)
-
-
Klerksdorp Field (1)
-
Murchison greenstone belt (1)
-
Transvaal region (3)
-
Witwatersrand (10)
-
-
-
-
Antarctica
-
Transantarctic Mountains (1)
-
Victoria Land (1)
-
-
Asia
-
Arabian Peninsula
-
Arabian Shield (1)
-
-
Central Asia
-
Kazakhstan
-
Eastern Kazakhstan (1)
-
-
-
Far East
-
China
-
Henan China (1)
-
Jiangxi China (1)
-
North China Platform (4)
-
Shanxi China (1)
-
Sichuan China (1)
-
South China Block (1)
-
Yangtze Platform (2)
-
-
Japan
-
Honshu
-
Ibaraki Japan (1)
-
-
-
-
Himalayas
-
Lesser Himalayas (1)
-
-
Indian Peninsula
-
India
-
Bastar Craton (1)
-
Maharashtra India
-
Koyna River (1)
-
-
Orissa India (1)
-
Rajasthan India
-
Aravalli Range (1)
-
-
Trans-Aravalli Vindhyan Basin (1)
-
-
-
Krasnoyarsk Russian Federation
-
Taymyr Dolgan-Nenets Russian Federation
-
Norilsk region (1)
-
-
-
Middle East
-
Iran (1)
-
Zagros (1)
-
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Siberia (1)
-
-
Atlantic Ocean
-
Mid-Atlantic Ridge (1)
-
-
atmosphere (2)
-
Australasia
-
Australia
-
New South Wales Australia (1)
-
Northern Territory Australia
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The silver deposits at Cobalt and Gowganda, Ontario. III: Hydrothermal regimes and source reservoirs–evidence from H, O, C, and Sr isotopes and fluid inclusions
THE STABLE AND RADIOGENIC ISOTOPIC ATTRIBUTES OF PRECIOUS-METAL-BEARING POLYMETALLIC VEINS FROM THE COBALT EMBAYMENT, NORTHERN ONTARIO, CANADA: GENETIC AND EXPLORATION IMPLICATIONS
The silver deposits at Cobalt and Gowganda, Ontario. I: Geology, petrography, and whole-rock geochemistry
Genetic Relationship Between Postcratering Dynamics and Footwall Deposit Formation at Sudbury, Ontario, Canada: Importance for Sulfide Ore Exploration
Regional and local controls on Archean rock-hosted cobalt mineralization at the McAra deposit, southern Superior Province, Ontario, Canada
THE LEAD ISOTOPE COMPOSITION OF ORE MINERALS FROM PRECIOUS METAL-BEARING, POLYMETALLIC VEIN SYSTEMS IN THE COBALT EMBAYMENT, NORTHERN ONTARIO: METALLOGENETIC IMPLICATIONS
High-temperature brine in chalcopyrite-rich quartz vein 40 km southwest of Sudbury, Ontario
The Cobalt Mining District: Silver Sources, Transport and Deposition
Oxygen isotope sedimentology of gold- and uranium-bearing Witwatersrand and Huronian Supergroup quartz-pebble conglomerates
Fluid inclusions in sulfides from North and South Range Cu-Ni-PGE deposits, Sudbury Structure, Ontario
Burial Metamorphism of Late Precambrian Sediments near St. John's, Newfoundland
Carbon and oxygen isotopic composition of calcite from all the polymetallic...
Formation temperature and ages of the True North ‘orogenic’ gold deposit in Manitoba, Canada
Abstract The True North orogenic gold deposit is situated in the 2.99–2.70 Ga Rice Lake greenstone belt near Bissett (Manitoba, Canada). This belt is the western equivalent of northern Ontario's Abitibi gold-producing region. The lithology and alteration, structural control, geochronological framework, and ore geology of the True North orogenic gold deposit have been addressed, but its formation temperature and age are poorly constrained. The deposit's gold-bearing veins are composed mostly of quartz (40 to 80%), ankerite (20 to 30%), and albite (5 to 25%), with minor muscovite, sericite, chlorite, and calcite. Sulfide minerals are dominated by pyrite and chalcopyrite and with minor pyrrhotite; native gold appears as inclusions in sulfides or as free gold. In general, most of the major minerals, the sulfides, and gold all precipitated during the main ore stage. The oxygen isotopic composition of co-existing quartz–albite and quartz–ankerite couples were used to calculate a formation temperature of approximately 230°C for these minerals, which is comparable to the nearby 007 gold deposit. These temperatures are on the low end of the temperature range reported for orogenic gold deposits. 40 Ar/ 39 Ar geochronology (single grain laser fusion of muscovite and sericite) revealed the presence of two age groups, at 2441.2 ± 8.8 Ma and 2483.1 ± 10.2 Ma, approximately 200 myr lower than the age of the main collision-related deformation within the Rice Lake belt. These ages indicate that the True North deposit was clearly post-orogenic, similar to vein gold deposits elsewhere, and was likely produced by the emplacement of the Huronian Supergroup and the thermal effects of the Matachewan large igneous province, which has the same ages. It is suggested that the True North deposit may belong to a descriptive category of post-orogenic low-temperature quartz–carbonate–albite vein gold deposit, more in line with recent developments in classification schemes.