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GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa (2)
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Congo Craton (3)
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East Africa
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Ethiopia (1)
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Ethiopian Rift (1)
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Kenya (1)
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Malawi (3)
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Mozambique
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Tete Mozambique (1)
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Sudan (6)
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Tanzania
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Olduvai Gorge (1)
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Zambia (1)
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East African Rift (4)
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Limpopo Belt (22)
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Madagascar
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Antananarivo Madagascar (1)
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Mozambique Belt (3)
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North Africa
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Algeria
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Atlas Mountains
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Moroccan Atlas Mountains
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Anti-Atlas (2)
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Egypt
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Eastern Desert (7)
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Libya
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Maghreb (1)
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Morocco
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Moroccan Atlas Mountains
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Anti-Atlas (2)
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Rehamna (1)
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Rif
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Tindouf Basin (2)
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Nubian Shield (8)
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Red Sea Hills (4)
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Sahara (1)
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Southern Africa
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Barberton greenstone belt (6)
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Botswana (4)
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Gariep Belt (1)
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Karoo Basin (2)
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Namaqualand (3)
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Namaqualand metamorphic complex (2)
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Namibia
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Kaoko Belt (4)
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South Africa
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Bushveld Complex (3)
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Cape Province region (1)
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Eastern Cape Province South Africa
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Cape Town South Africa (1)
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Gauteng South Africa
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Johannesburg South Africa (1)
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KwaZulu-Natal South Africa
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Durban South Africa (1)
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Limpopo South Africa (1)
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Mpumalanga South Africa
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Sutherland South Africa (1)
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Transvaal region (6)
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Western Cape Province South Africa (1)
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Witwatersrand (4)
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Swaziland (1)
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Zimbabwe
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Belingwe greenstone belt (1)
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Selukwe Zimbabwe (1)
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West Africa
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Benin (1)
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Niger (2)
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Nigeria
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Togo (1)
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West African Craton (2)
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East Antarctica (8)
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Arctic region
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Asia
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Indonesia
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Japan
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Korea
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Laos (1)
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Lesser Sunda Islands
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Timor (1)
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Mongolia
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Thailand
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Himalayas
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India
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Gujarat India
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Karnataka India
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Kolar schist belt (1)
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Madhya Pradesh India
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Northeastern India
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Tamil Nadu India
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West Bengal India
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Nepal
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Pakistan
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Kemerovo Russian Federation (1)
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Khakasiya Russian Federation
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Kopet-Dag Range (1)
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Taymyr Dolgan-Nenets Russian Federation
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Main Central Thrust (25)
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Middle East
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Quebec
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Azerbaijan
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Caucasus
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North America
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Taltson magmatic zone (6)
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Rocky Mountains foreland (4)
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North Pacific
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South Pacific
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West Pacific
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Pacific region
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Pacific-Antarctic Ridge (1)
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South America
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Argentina
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Brazil
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Para Brazil
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Carajas mineral province (4)
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Paraiba Brazil (3)
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Chile
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Peru
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South Island (18)
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United States
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Alabama
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metals
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alkali metals
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strontium
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Rb-87/Sr-86 (4)
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aluminum
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Rn-222 (1)
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oxygen
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Graptolithina
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Invertebrata
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Protista
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-
Bishop Tuff (1)
-
lower Pleistocene
-
Calabrian (2)
-
-
middle Pleistocene (1)
-
upper Pleistocene
-
Lisan Formation (1)
-
-
-
upper Quaternary (5)
-
-
Tertiary
-
lower Tertiary (12)
-
middle Tertiary (8)
-
Neogene
-
Miocene
-
Astoria Formation (1)
-
Columbia River Basalt Group (3)
-
Grande Ronde Basalt (1)
-
lower Miocene
-
Aquitanian (1)
-
-
middle Miocene
-
Serravallian (2)
-
-
upper Miocene
-
Messinian (2)
-
Tortonian (2)
-
-
-
Pliocene
-
Cimmerian (1)
-
lower Pliocene
-
Zanclean (1)
-
-
middle Pliocene (1)
-
upper Pliocene
-
Piacenzian (1)
-
-
-
-
Paleogene
-
Eocene
-
lower Eocene
-
Ypresian
-
London Clay (1)
-
-
-
middle Eocene
-
Yegua Formation (1)
-
-
upper Eocene
-
Priabonian (2)
-
-
-
Ghost Rocks Formation (2)
-
lower Paleogene (3)
-
Oligocene
-
Boom Clay (1)
-
lower Oligocene
-
Rupelian (2)
-
-
upper Oligocene (6)
-
-
Orca Group (1)
-
Paleocene
-
lower Paleocene
-
Danian (1)
-
K-T boundary (1)
-
-
upper Paleocene (1)
-
-
Sinjar Formation (1)
-
-
upper Tertiary (1)
-
-
upper Cenozoic (9)
-
Wildcat Group (1)
-
-
Dalradian (11)
-
Mesozoic
-
Carrara Marble (1)
-
Cretaceous
-
Comanchean
-
Edwards Formation (1)
-
Georgetown Formation (1)
-
Glen Rose Formation (1)
-
Pearsall Formation (1)
-
-
Dakota Formation (2)
-
Kuskokwim Group (1)
-
Lower Cretaceous
-
Albian
-
upper Albian (1)
-
-
Aptian (3)
-
Edwards Formation (1)
-
Georgetown Formation (1)
-
Glen Rose Formation (1)
-
Muddy Sandstone (1)
-
Pearsall Formation (1)
-
Sligo Formation (1)
-
Torok Formation (1)
-
-
Middle Cretaceous (15)
-
Upper Cretaceous
-
Bearpaw Formation (1)
-
Duwi Formation (1)
-
Judith River Formation (1)
-
K-T boundary (1)
-
Maestrichtian (2)
-
Niobrara Formation (1)
-
Pierre Shale (1)
-
Senonian (1)
-
Straight Cliffs Formation (1)
-
Tuolumne Intrusive Suite (4)
-
Turonian (1)
-
-
Valdez Group (1)
-
-
Franciscan Complex (6)
-
Jurassic
-
Aztec Sandstone (1)
-
Coast Range Ophiolite (1)
-
Lower Jurassic
-
Laberge Group (1)
-
Pliensbachian (1)
-
-
Middle Jurassic
-
Bathonian (1)
-
Callovian (1)
-
-
Upper Jurassic
-
Entrada Sandstone (2)
-
Josephine Ophiolite (2)
-
Josephine Peridotite (1)
-
Kimmeridgian (1)
-
Oxfordian (1)
-
Tithonian (1)
-
-
-
lower Mesozoic (2)
-
Navajo Sandstone (3)
-
Triassic
-
Lower Triassic
-
Permian-Triassic boundary (3)
-
-
Middle Triassic (2)
-
Upper Triassic
-
Sag River Sandstone (1)
-
Stuhini Group (1)
-
-
-
upper Mesozoic (1)
-
Wingate Sandstone (1)
-
-
Moldanubian (2)
-
Paleozoic
-
Acatlan Complex (1)
-
Cambrian
-
Lardeau Group (1)
-
Lower Cambrian
-
Murphy Marble (1)
-
Poleta Formation (1)
-
-
Middle Cambrian
-
Barrandian (1)
-
-
Mount Read Volcanics (1)
-
Upper Cambrian (3)
-
-
Carboniferous
-
Lower Carboniferous
-
Dinantian (7)
-
-
Mabou Group (1)
-
Middle Carboniferous (2)
-
Mississippian
-
Lower Mississippian
-
Tournaisian (2)
-
-
Middle Mississippian
-
Visean (3)
-
-
Upper Mississippian
-
Mauch Chunk Formation (1)
-
Serpukhovian (1)
-
-
Windsor Group (1)
-
-
Namurian (1)
-
Pennsylvanian
-
Cumberland Group (1)
-
Lower Pennsylvanian
-
Bashkirian (1)
-
-
Upper Pennsylvanian (1)
-
-
Upper Carboniferous
-
Stephanian (1)
-
Uralian (2)
-
-
-
Catskill Formation (1)
-
Cow Head Group (1)
-
Devonian
-
Lower Devonian
-
Emsian (2)
-
Shap Granite (1)
-
-
Middle Devonian
-
Dundee Limestone (1)
-
Elk Point Group (1)
-
Sulphur Point Formation (1)
-
-
Upper Devonian
-
Famennian (1)
-
-
-
Leinster Granite (1)
-
lower Paleozoic
-
Bay of Islands Ophiolite (2)
-
-
middle Paleozoic (6)
-
Ordovician
-
Lower Ordovician
-
Beekmantown Group (1)
-
Floian (1)
-
Manitou Formation (1)
-
Tremadocian
-
Halifax Formation (2)
-
-
-
Martinsburg Formation (1)
-
Meguma Group (1)
-
Middle Ordovician
-
Normanskill Formation (1)
-
Simpson Group (1)
-
-
Skiddaw Slates (1)
-
Tetagouche Group (1)
-
Upper Ordovician (3)
-
-
Permian
-
Ecca Group (1)
-
Guadalupian (1)
-
Kaibab Formation (1)
-
Lower Permian
-
Cisuralian (1)
-
Leman Sandstone Formation (1)
-
-
Unayzah Formation (1)
-
Upper Permian
-
Permian-Triassic boundary (3)
-
-
Vryheid Formation (1)
-
-
Silurian
-
Lower Silurian
-
Llandovery (2)
-
Wenlock
-
Homerian (1)
-
-
-
Middle Silurian (1)
-
Upper Silurian
-
Bloomsburg Formation (1)
-
Ludlow (2)
-
Pridoli (1)
-
-
-
upper Paleozoic
-
Garhwal Group (1)
-
-
-
Phanerozoic (9)
-
Precambrian
-
Archean
-
Amisk Group (3)
-
Aravalli System (1)
-
Blake River Group (2)
-
Bulawayan Group (1)
-
Fig Tree Group (1)
-
Iron Ore Group (1)
-
Kalgoorlie System (1)
-
Mesoarchean (12)
-
Neoarchean
-
Dharwar Supergroup (2)
-
-
Paleoarchean (6)
-
Peninsular Gneiss (1)
-
Rice Lake Group (1)
-
Singhbhum Granite (2)
-
Taihua Group (1)
-
Timiskaming Group (2)
-
Yellowknife Group (1)
-
-
Chuar Group (1)
-
Delhi Supergroup (1)
-
Eocambrian (1)
-
Hecla Hoek Formation (1)
-
Kingston Peak Formation (1)
-
Kisseynew Complex (3)
-
Lewisian Complex (6)
-
Minas Supergroup (1)
-
Missi Group (1)
-
Onverwacht Group (1)
-
Pongola Supergroup (1)
-
Purcell System (3)
-
Stillwater Complex (1)
-
Stirling Quartzite (1)
-
Transvaal Supergroup (2)
-
Twilight Gneiss (1)
-
Unkar Group (1)
-
upper Precambrian
-
Proterozoic
-
Athabasca Formation (2)
-
Banded Gneissic Complex (1)
-
Damara System (1)
-
Huronian
-
Gowganda Formation (1)
-
-
Kombolgie Formation (1)
-
Lewisian (4)
-
Mesoproterozoic
-
Aldridge Formation (1)
-
Belt Supergroup (4)
-
Gawler Range Volcanics (1)
-
Hiltaba Suite (1)
-
Laxfordian (4)
-
Shuangqiaoshan Group (1)
-
Soldiers Cap Group (1)
-
-
Miette Group (1)
-
Neoproterozoic
-
Cryogenian (1)
-
Ediacaran (6)
-
Infracambrian (2)
-
Moine Supergroup (4)
-
Moinian (4)
-
Tonian (6)
-
Vendian (4)
-
-
Ortega Group (1)
-
Paleoproterozoic
-
Birimian (7)
-
Dhanjori Group (2)
-
Karelian (1)
-
Orosirian (2)
-
Svecofennian (3)
-
Whitewater Group (1)
-
Willyama Supergroup (1)
-
Wollaston Group (1)
-
-
Sinian (1)
-
-
-
Witwatersrand Supergroup (1)
-
-
Rhenohercynian (2)
-
Saxothuringian (1)
-
-
igneous rocks
-
extrusive rocks (7)
-
igneous rocks
-
carbonatites
-
sovite (1)
-
-
granophyre (1)
-
hypabyssal rocks (1)
-
kimberlite (5)
-
picrite (1)
-
plutonic rocks
-
anorthosite (8)
-
diabase (6)
-
diorites
-
ferrodiorite (1)
-
microdiorite (1)
-
plagiogranite (2)
-
quartz diorites (4)
-
tonalite
-
enderbite (3)
-
-
trondhjemite (7)
-
-
essexite (1)
-
gabbros
-
alkali gabbros (1)
-
anorthositic gabbro (1)
-
-
granites
-
adamellite (1)
-
alkali granites (1)
-
aplite (3)
-
A-type granites (8)
-
biotite granite (2)
-
charnockite (7)
-
granite porphyry (2)
-
granosyenite (1)
-
I-type granites (3)
-
leucogranite (37)
-
monzogranite (8)
-
rapakivi (4)
-
S-type granites (6)
-
two-mica granite (1)
-
-
granodiorites (40)
-
lamprophyres
-
kersantite (1)
-
minette (1)
-
-
monzodiorite (6)
-
monzonites (10)
-
pegmatite (33)
-
quartz monzonite (4)
-
sovite (1)
-
syenites
-
albitite (2)
-
alkali syenites (1)
-
granosyenite (1)
-
nepheline syenite (2)
-
quartz syenite (1)
-
-
ultramafics
-
chromitite (1)
-
peridotites
-
dunite (3)
-
garnet lherzolite (1)
-
harzburgite (4)
-
lherzolite (3)
-
spinel lherzolite (1)
-
spinel peridotite (2)
-
-
pyroxenite
-
garnet pyroxenite (1)
-
-
-
-
porphyry (7)
-
volcanic rocks
-
adakites (1)
-
andesites (4)
-
basalts
-
alkali basalts
-
hawaiite (1)
-
mugearite (1)
-
spilite (3)
-
-
flood basalts (2)
-
mid-ocean ridge basalts (6)
-
ocean-island basalts (2)
-
shoshonite (2)
-
tholeiite (1)
-
-
benmoreite (1)
-
dacites (2)
-
glasses
-
obsidian (1)
-
volcanic glass (1)
-
-
komatiite (6)
-
pyroclastics
-
ash-flow tuff (1)
-
ignimbrite (8)
-
pumice (1)
-
scoria (1)
-
tuff (6)
-
welded tuff (1)
-
-
rhyodacites (1)
-
rhyolites (10)
-
trachytes (1)
-
-
-
ophiolite (37)
-
volcanic ash (1)
-
-
metamorphic rocks
-
metamorphic rocks
-
amphibolites (32)
-
cataclasites (25)
-
eclogite (23)
-
gneisses
-
augen gneiss (9)
-
banded gneiss (1)
-
biotite gneiss (2)
-
granite gneiss (14)
-
orthogneiss (33)
-
paragneiss (18)
-
sillimanite gneiss (1)
-
tonalite gneiss (1)
-
-
granulites
-
kinzigite (1)
-
-
hornfels (3)
-
impactites (1)
-
itabirite (1)
-
marbles
-
brucite marble (1)
-
-
metacarbonate rocks (2)
-
metaigneous rocks
-
meta-andesite (1)
-
metabasalt (6)
-
metabasite (5)
-
metadacite (1)
-
metadiabase (2)
-
metadiorite (4)
-
metagabbro (8)
-
metagranite (16)
-
metaperidotite (2)
-
metarhyolite (1)
-
serpentinite (6)
-
-
metaplutonic rocks (12)
-
metasedimentary rocks
-
khondalite (1)
-
metaconglomerate (3)
-
metalimestone (1)
-
metapelite (15)
-
metasandstone (2)
-
paragneiss (18)
-
-
metasomatic rocks
-
fenite (1)
-
serpentinite (6)
-
skarn (11)
-
-
metavolcanic rocks (37)
-
migmatites (60)
-
mylonites
-
blastomylonite (6)
-
pseudotachylite (27)
-
ultramylonite (17)
-
-
phyllites (8)
-
phyllonites (9)
-
quartzites (28)
-
schists
-
biotite schist (1)
-
blueschist (6)
-
chlorite schist (1)
-
greenschist (4)
-
greenstone (11)
-
muscovite schist (1)
-
tourmalinite (1)
-
-
slates (11)
-
-
ophiolite (37)
-
turbidite (9)
-
-
minerals
-
alloys
-
electrum (2)
-
-
arsenides
-
arsenopyrite (5)
-
cobaltite (1)
-
gersdorffite (1)
-
-
carbonates
-
ankerite (3)
-
aragonite (1)
-
bastnaesite (1)
-
calcite (17)
-
dolomite (2)
-
parisite (1)
-
synchysite (1)
-
-
halides
-
chlorides
-
halite (5)
-
-
fluorides
-
bastnaesite (1)
-
fluorite (1)
-
parisite (1)
-
synchysite (1)
-
-
zunyite (1)
-
-
hydrates (1)
-
minerals (10)
-
native elements
-
diamond (1)
-
graphite (7)
-
-
oxides
-
baddeleyite (2)
-
cassiterite (2)
-
chrome spinel (1)
-
chromite (1)
-
diaspore (1)
-
hematite (2)
-
ilmenite (3)
-
iron oxides (6)
-
magnetite (12)
-
niobates
-
columbite (3)
-
pyrochlore (1)
-
-
rutile (8)
-
spinel (5)
-
uraninite (5)
-
zirconolite (1)
-
-
phosphates
-
apatite (33)
-
fluorapatite (2)
-
monazite (58)
-
triphylite (1)
-
xenotime (4)
-
-
platinum minerals (1)
-
selenides (1)
-
silicates
-
aluminosilicates (2)
-
chain silicates
-
amphibole group
-
clinoamphibole
-
actinolite (1)
-
hornblende (31)
-
-
-
pyroxene group
-
alkalic pyroxene (1)
-
clinopyroxene
-
aegirine (1)
-
augite (1)
-
diopside (1)
-
omphacite (1)
-
pigeonite (1)
-
spodumene (2)
-
-
orthopyroxene (4)
-
-
wollastonite group
-
wollastonite (1)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
adularia (3)
-
K-feldspar (21)
-
microcline (1)
-
orthoclase (1)
-
perthite (1)
-
-
plagioclase
-
albite (5)
-
anorthite (2)
-
-
-
scapolite group
-
scapolite (1)
-
-
silica minerals
-
chalcedony (1)
-
coesite (2)
-
quartz
-
smoky quartz (1)
-
-
-
zeolite group
-
pollucite (1)
-
-
-
orthosilicates
-
nesosilicates
-
andalusite (3)
-
datolite group
-
gadolinite (1)
-
-
garnet group
-
almandine (1)
-
majorite (1)
-
-
kyanite (7)
-
mullite (1)
-
olivine group
-
fayalite (1)
-
olivine (5)
-
ringwoodite (1)
-
-
phenakite group
-
willemite (1)
-
-
sillimanite (6)
-
staurolite (5)
-
titanite group
-
titanite (26)
-
-
zircon group
-
coffinite (1)
-
thorite (3)
-
zircon (212)
-
-
-
sorosilicates
-
epidote group
-
allanite (3)
-
epidote (2)
-
zoisite (1)
-
-
lawsonite (1)
-
zunyite (1)
-
-
-
ring silicates
-
beryl (3)
-
cordierite (2)
-
emerald (1)
-
tourmaline group
-
elbaite (1)
-
-
-
sheet silicates
-
chlorite group
-
chlorite (12)
-
-
clay minerals
-
dickite (1)
-
halloysite (1)
-
kaolinite (5)
-
smectite (1)
-
-
illite (3)
-
mica group
-
annite (1)
-
biotite (50)
-
celadonite (1)
-
fuchsite (1)
-
lepidolite (1)
-
muscovite (70)
-
phengite (6)
-
phlogopite (3)
-
-
palygorskite (1)
-
pyrophyllite (1)
-
sericite (5)
-
serpentine group
-
antigorite (1)
-
berthierine (1)
-
chrysotile (2)
-
lizardite (1)
-
serpentine (1)
-
-
talc (2)
-
-
-
sulfates
-
anhydrite (1)
-
barite (2)
-
gypsum (1)
-
-
sulfides
-
arsenopyrite (5)
-
bismuthinite (1)
-
bornite (6)
-
chalcopyrite (13)
-
cobaltite (1)
-
galena (4)
-
gersdorffite (1)
-
iron sulfides (1)
-
joseite (1)
-
marcasite (1)
-
molybdenite (11)
-
pentlandite (3)
-
pyrite (16)
-
pyrrhotite (10)
-
sphalerite (3)
-
stibnite (1)
-
valleriite (1)
-
violarite (1)
-
-
sulfosalts
-
sulfobismuthites
-
cosalite (1)
-
gustavite (1)
-
lillianite (1)
-
matildite (1)
-
-
-
tellurides
-
joseite (1)
-
-
tungstates
-
scheelite (4)
-
-
uranium minerals (1)
-
-
Primary terms
-
absolute age (465)
-
Africa
-
Central Africa (2)
-
Congo Craton (3)
-
East Africa
-
Ethiopia (1)
-
Ethiopian Rift (1)
-
Kenya (1)
-
Malawi (3)
-
Mozambique
-
Tete Mozambique (1)
-
-
Sudan (6)
-
Tanzania
-
Olduvai Gorge (1)
-
-
Zambia (1)
-
-
East African Rift (4)
-
Limpopo Basin (1)
-
Limpopo Belt (22)
-
Madagascar
-
Antananarivo Madagascar (1)
-
-
Mozambique Belt (3)
-
North Africa
-
Algeria
-
Ahaggar (1)
-
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
Anti-Atlas (2)
-
-
-
Egypt
-
Eastern Desert (7)
-
Kosseir Egypt (1)
-
Nile Delta (1)
-
Sinai Egypt (2)
-
Zabargad Island (1)
-
-
Libya
-
Cyrenaica (1)
-
Sirte Basin (1)
-
-
Maghreb (1)
-
Morocco
-
Moroccan Atlas Mountains
-
Anti-Atlas (2)
-
-
Rehamna (1)
-
Rif
-
Beni Bouchera (1)
-
-
-
Tindouf Basin (2)
-
Tunisia (2)
-
Western Sahara (1)
-
-
Nubian Shield (8)
-
Red Sea Hills (4)
-
Sahara (1)
-
Southern Africa
-
Barberton greenstone belt (6)
-
Botswana (4)
-
Gariep Belt (1)
-
Kaapvaal Craton (15)
-
Kalahari Craton (1)
-
Karoo Basin (2)
-
Namaqualand (3)
-
Namaqualand metamorphic complex (2)
-
Namibia
-
Damara Belt (2)
-
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GeoRef Categories
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shear zones
Zircon U-Pb-Hf isotope evidence from gabbros of the Summit igneous complex for a latest Jurassic rift through the southern Sierra Nevada arc crust, California, USA Open Access
ABSTRACT Hafnium isotope ratios in Late Jurassic zircon from the Summit Gabbro provide geochemical evidence for rifting at ca. 148 Ma through the southern Sierra Nevada arc crust. Previous evidence for intra-arc extension includes a linear distribution of early Mesozoic volcano-sedimentary deposits located within the regional footprint of the ~600-km-long Independence dike swarm. In this study, latest Jurassic rifting through the entire thickness of the arc crust is supported by an abrupt, 40-εHf i -unit isotopic pull-up that records the incorporation of depleted-mantle partial melts into basaltic magmas that rapidly migrated into the upper arc crust. Isotopic context for this latest Jurassic pull-up is provided by Permian through Cretaceous zircon xenocrysts sampled by ca. 85–78 Ma dikes and sills that sampled the crust underlying the eastern Sierra Nevada range crest. Summit Gabbro bodies define a northwest-trending lineament paralleling the Kern Plateau shear zone, a geometry consistent with previous interpretations that the Kern Plateau shear zone originated as a late Paleozoic sinistral transform fault that evolved to a normal fault accommodating early Mesozoic intra-arc extension. New zircon U-Pb geochronology data coupled with field observations and whole-rock geochemistry serve as the basis to reclassify Summit gabbros and diorites as latest Jurassic and to motivate definition of the bimodal Summit igneous complex (151.0 ± 1.7–146.1 ± 1.2 Ma; N = 15) as also including coeval gabbro-granite dikes of the Osa Creek ring complex and the newly defined Tübatulabal hypabyssal-volcanic series. Tight age constraints support correlation of the Summit igneous complex to the regionally extensive, ca. 148 Ma Independence dike swarm. Multiple lines of evidence support latest Jurassic Sierran arc magmagenesis within a north-northwest–trending, sinistral transtensional regime, including: (1) subparallel orientations of the Independence dike swarm and aligned Summit Gabbro intrusions; (2) overlapping and bimodal compositions in both suites; and (3) the dramatic Hf isotope pull-up in zircons from Summit gabbro-diorites, recording a short-lived increase in the proportion of isotopically primitive mafic magmas intruding into the shallow arc crust. Though clearly differentiated, the composition of one gabbroic dike is the most primitive composition reported in the Sierra Nevada arc to date. The footprint of an intra-arc graben produced by early Mesozoic extension in eastern California is constrained by the Independence dike swarm, the Kern Plateau shear zone, and the Summit igneous complex, along with distributions of Triassic–Jurassic volcano-sedimentary deposits. Coupling the history of motion along the Kern Plateau shear zone with evidence for local extension beginning in the Permian–Triassic arc, we hypothesize that Mesozoic intra-arc faulting was strongly influenced by north-northwest–trending structures inherited from a mid- to late Paleozoic sinistral transpressional-transtensional plate boundary that extended for thousands of kilometers along the western boundary of Laurentia. We assemble a Permian–Jurassic time line of intra-arc extension within the plate margin locally transitioning from sinistral transform to convergent, one that culminated in latest Jurassic rifting through the entire crust underlying the Kern Plateau.