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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Tanzania (1)
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Madagascar (1)
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North Africa
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Algeria
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Morocco
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Southern Africa
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Antarctica
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Asia
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Canada
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Commonwealth of Independent States
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Russian Federation
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Irkutsk Russian Federation (4)
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West Siberia
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Southern Europe
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Greece
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Spain
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Betic Cordillera (2)
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Galicia Spain
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Ordenes Complex (2)
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Sierra de Guadarrama (1)
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Spanish Central System (1)
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Italy
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Apennines
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Western Europe
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France
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Ireland
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Scandinavia
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Western Gneiss region (1)
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United Kingdom
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Great Britain
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Wales
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Caernarvonshire Wales
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Indian Ocean Islands
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Madagascar (1)
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Mediterranean region
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Aegean Islands
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Greek Aegean Islands
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Cyclades
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Syros (2)
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Calabrian Arc (1)
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Mediterranean Sea
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East Mediterranean
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North America
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Appalachians
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Canadian Shield
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Superior Province
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Pacific Ocean
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West Pacific
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Argentina (1)
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Brazil
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Chile (2)
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United States
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California
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New York
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North Carolina
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Texas
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U. S. Rocky Mountains
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Utah
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Washington
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aluminum (1)
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gold (2)
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Hf-177/Hf-176 (4)
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lead
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oxygen
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middle Mesozoic (1)
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Paleozoic
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Devonian
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lower Paleozoic
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middle Paleozoic (2)
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upper Paleozoic
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Precambrian
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Biwabik Iron Formation (1)
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phosphates
-
monazite (2)
-
-
silicates
-
chain silicates
-
aenigmatite group
-
sapphirine (1)
-
-
amphibole group
-
alkalic amphibole (1)
-
clinoamphibole
-
actinolite (4)
-
arfvedsonite (1)
-
cummingtonite (2)
-
glaucophane (3)
-
grunerite (1)
-
hornblende (8)
-
pargasite (2)
-
tremolite (1)
-
tschermakite (1)
-
-
-
carpholite (1)
-
prehnite (2)
-
pyroxene group
-
clinopyroxene
-
augite (1)
-
jadeite (2)
-
omphacite (5)
-
-
orthopyroxene (2)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
K-feldspar (1)
-
-
plagioclase
-
albite (3)
-
oligoclase (1)
-
-
-
silica minerals
-
coesite (1)
-
quartz (3)
-
-
-
orthosilicates
-
nesosilicates
-
andalusite (2)
-
garnet group
-
grossular (1)
-
hydrogarnet
-
hydrogrossular (1)
-
-
pyrope (1)
-
uvarovite (1)
-
-
kyanite (7)
-
sillimanite (4)
-
staurolite (5)
-
titanite group
-
titanite (3)
-
-
zircon group
-
zircon (22)
-
-
-
sorosilicates
-
epidote group
-
clinozoisite (1)
-
epidote (5)
-
zoisite (1)
-
-
pumpellyite group
-
pumpellyite (4)
-
-
-
-
ring silicates
-
cordierite (2)
-
-
sheet silicates
-
chlorite group
-
chlorite (8)
-
-
clay minerals
-
saponite (1)
-
smectite (3)
-
-
corrensite (2)
-
illite (1)
-
mica group
-
biotite (5)
-
celadonite (2)
-
muscovite (5)
-
paragonite (1)
-
phengite (4)
-
-
serpentine group
-
berthierine (1)
-
-
stilpnomelane (1)
-
talc (1)
-
-
-
sulfides
-
pyrite (2)
-
pyrrhotite (2)
-
-
-
Primary terms
-
absolute age (38)
-
Africa
-
East Africa
-
Tanzania (1)
-
-
Madagascar (1)
-
North Africa
-
Algeria
-
Ahaggar (1)
-
-
Morocco
-
Rif (1)
-
-
-
Southern Africa
-
Kaapvaal Craton (1)
-
Namaqualand (1)
-
Namibia
-
Kaoko Belt (1)
-
-
South Africa (1)
-
-
-
Antarctica
-
East Antarctica (1)
-
Queen Maud Land (2)
-
-
Arctic region
-
Greenland
-
East Greenland (1)
-
-
-
Asia
-
Altai Mountains
-
Gorny Altai (2)
-
Kuznetsk Alatau (1)
-
Mongolian Altai (1)
-
-
Altai Russian Federation
-
Gorny Altai (2)
-
-
Amur Russian Federation (2)
-
Arabian Peninsula
-
Oman
-
Oman Mountains (2)
-
-
-
Baikal region (1)
-
Buryat Russian Federation (1)
-
Central Asia
-
Kazakhstan
-
Eastern Kazakhstan (1)
-
-
-
Dzhugdzhur region (1)
-
Far East
-
China
-
Dabie Mountains (1)
-
Gansu China (1)
-
Longmenshan (1)
-
North China Platform (1)
-
Qilian Mountains (1)
-
Qinghai China (1)
-
Sulu Terrane (2)
-
Tarim Platform (1)
-
Tongbai Mountains (1)
-
-
Japan
-
Chichibu Belt (1)
-
Kurosegawa Zone (1)
-
Kyushu (1)
-
Sambagawa Belt (1)
-
Shikoku
-
Kochi Japan (1)
-
-
-
Korea
-
South Korea
-
Gyeonggi Massif (1)
-
-
-
Mongolia
-
Mongolian Altai (1)
-
-
-
Himalayas (3)
-
Indian Peninsula
-
India
-
Dharwar Craton (1)
-
Kerala India
-
Cannanore India (1)
-
-
Kolar schist belt (1)
-
Rajasthan India
-
Sirohi India (1)
-
-
Southern Granulite Terrain (1)
-
Uttar Pradesh India (1)
-
Uttarakhand India
-
Chamoli India (1)
-
-
-
Jammu and Kashmir
-
Kashmir (1)
-
Ladakh (2)
-
-
Pakistan
-
North-West Frontier Pakistan
-
Hazara Pakistan (1)
-
-
-
-
Irkutsk Russian Federation (4)
-
Krasnoyarsk Russian Federation (2)
-
Middle East
-
Turkey
-
Pontic Mountains (1)
-
Taurus Mountains (1)
-
-
-
Russian Far East (1)
-
Sayan
-
Eastern Sayan (2)
-
-
Siberia (2)
-
Siberian fold belt (1)
-
Siberian Platform
-
Aldan Shield (3)
-
Yenisei Ridge (1)
-
-
Stanovoy Range (2)
-
Tibetan Plateau (2)
-
West Siberia
-
Kuznetsk Alatau (1)
-
-
Yenisei River (1)
-
-
Atlantic region (1)
-
Australasia
-
Australia
-
Queensland Australia
-
Mount Isa Australia (1)
-
-
Western Australia
-
Halls Creek Orogen (1)
-
Hamersley Basin (2)
-
-
-
New Zealand (1)
-
Papua New Guinea (1)
-
-
bibliography (1)
-
Canada
-
Eastern Canada
-
Newfoundland and Labrador
-
Newfoundland (1)
-
-
Ontario
-
Hemlo Deposit (1)
-
-
Quebec
-
Abitibi County Quebec
-
Chibougamau Quebec (1)
-
-
Dore Lake Complex (1)
-
Gaspe Peninsula (1)
-
Noranda Quebec (1)
-
Temiscamingue County Quebec
-
Rouyn Quebec (1)
-
-
-
-
Western Canada
-
British Columbia
-
Vancouver Island (2)
-
-
Manitoba
-
Flin Flon Manitoba (1)
-
-
-
-
carbon
-
C-13/C-12 (2)
-
-
Caribbean region
-
West Indies
-
Antilles
-
Greater Antilles
-
Cuba (1)
-
-
-
-
-
Cenozoic
-
Quaternary
-
Holocene
-
Neolithic (1)
-
-
-
Stone Age
-
Neolithic (1)
-
-
Tertiary
-
Challis Volcanics (1)
-
Paleogene
-
Eocene (1)
-
Paleocene (1)
-
-
-
-
Central America
-
Guatemala
-
Motagua Fault (1)
-
-
-
chemical analysis (1)
-
clay mineralogy (4)
-
continental drift (1)
-
crust (23)
-
crystal chemistry (7)
-
crystal growth (1)
-
crystal structure (1)
-
data processing (2)
-
deformation (10)
-
diagenesis (2)
-
earthquakes (1)
-
economic geology (2)
-
Europe
-
Alps
-
Central Alps
-
Lepontine Alps (1)
-
Pennine Alps (1)
-
-
Swiss Alps (1)
-
Western Alps (2)
-
-
Bashkortostan Russian Federation (1)
-
Carpathians
-
Bukk Mountains (1)
-
Western Carpathians (1)
-
-
Central Europe
-
Austria
-
Lower Austria (1)
-
North Austrian Crystallines (1)
-
-
Black Forest (1)
-
Bohemian Massif (4)
-
Czech Republic
-
Czech Erzgebirge (1)
-
-
Erzgebirge
-
Czech Erzgebirge (1)
-
-
Germany (2)
-
Hungary
-
Bukk Mountains (1)
-
Transdanubia (1)
-
-
Poland
-
Polish Sudeten Mountains (1)
-
Sowie Mountains (1)
-
-
Slovakia (1)
-
Sudeten Mountains
-
Izera Mountains (2)
-
Karkonosze Mountains (2)
-
Polish Sudeten Mountains (1)
-
Sowie Mountains (1)
-
-
Switzerland
-
Swiss Alps (1)
-
Valais Switzerland
-
Zermatt Switzerland (2)
-
-
-
-
Fennoscandian Shield (1)
-
Karelia Russian Federation (1)
-
Lake Ladoga region (1)
-
Southern Europe
-
Greece
-
Greek Aegean Islands
-
Cyclades
-
Syros (2)
-
-
-
Hellenides (1)
-
-
Iberian Peninsula
-
Iberian Massif (1)
-
Ossa-Morena Zone (1)
-
Spain
-
Andalusia Spain
-
Alpujarride Complex (1)
-
Nevado-Filabride Complex (1)
-
-
Betic Cordillera (2)
-
Galicia Spain
-
La Coruna Spain
-
Santiago de Compostela Spain (1)
-
-
Lugo Spain (1)
-
Ordenes Complex (2)
-
-
Sierra de Guadarrama (1)
-
-
Spanish Central System (1)
-
-
Italy
-
Apennines
-
Southern Apennines (2)
-
-
Basilicata Italy (1)
-
Calabria Italy
-
Sila Massif (1)
-
-
Ivrea-Verbano Zone (1)
-
Liguria Italy (1)
-
Piemonte Italy (1)
-
Sardinia Italy (1)
-
Sicily Italy (1)
-
Strona Valley (1)
-
Valle d'Aosta Italy (1)
-
-
-
Tauern Window (1)
-
Variscides (5)
-
Western Europe
-
France
-
Aude France (1)
-
Aveyron France (1)
-
Central Massif
-
Montagne Noire (1)
-
-
Cher France (1)
-
Correze France (1)
-
Corsica (1)
-
Cotes-d'Armor France (1)
-
Isere France (1)
-
Limousin (1)
-
Lozere France (2)
-
Rouergue (2)
-
Vienne France (1)
-
-
Ireland
-
Mayo Ireland (1)
-
-
Scandinavia
-
Norway
-
Southern Norway (1)
-
Telemark Norway
-
Bamble Norway (2)
-
-
-
Western Gneiss region (1)
-
-
United Kingdom
-
Great Britain
-
Scotland
-
Scottish Highlands
-
Grampian Highlands (1)
-
-
-
Wales
-
Caernarvonshire Wales
-
Snowdonia (1)
-
-
Gwynedd Wales
-
Snowdonia (1)
-
-
-
-
-
-
-
faults (17)
-
folds (4)
-
foliation (5)
-
fractures (1)
-
geochemistry (35)
-
geochronology (3)
-
heat flow (1)
-
hydrogen
-
D/H (1)
-
-
igneous rocks
-
plutonic rocks
-
anorthosite (2)
-
diabase (5)
-
diorites
-
plagiogranite (3)
-
tonalite
-
enderbite (1)
-
-
-
gabbros (10)
-
granites
-
leucogranite (1)
-
-
granodiorites (3)
-
lamproite (1)
-
monzonites (1)
-
pegmatite (1)
-
syenites (1)
-
ultramafics
-
peridotites
-
dunite (1)
-
harzburgite (1)
-
lherzolite (1)
-
-
pyroxenite
-
websterite (1)
-
-
-
-
volcanic rocks
-
adakites (2)
-
andesites
-
boninite (1)
-
-
basalts
-
alkali basalts (2)
-
mid-ocean ridge basalts (7)
-
ocean-island basalts (2)
-
tholeiite (8)
-
tholeiitic basalt (3)
-
-
komatiite (3)
-
rhyolites
-
quartz porphyry (1)
-
-
-
-
inclusions
-
fluid inclusions (4)
-
-
Indian Ocean Islands
-
Madagascar (1)
-
-
intrusions (18)
-
Invertebrata
-
Protista
-
Foraminifera (1)
-
-
-
isotopes
-
radioactive isotopes
-
Ar-39 (1)
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Rb-87/Sr-86 (2)
-
Sm-147/Nd-144 (4)
-
-
stable isotopes
-
Ar-40 (1)
-
C-13/C-12 (2)
-
D/H (1)
-
Hf-177/Hf-176 (4)
-
Nd-144/Nd-143 (8)
-
O-18/O-16 (4)
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
Rb-87/Sr-86 (2)
-
S-34/S-32 (1)
-
Sm-147/Nd-144 (4)
-
Sr-87/Sr-86 (10)
-
-
-
lava (3)
-
lineation (2)
-
magmas (12)
-
mantle (7)
-
Mediterranean region
-
Aegean Islands
-
Greek Aegean Islands
-
Cyclades
-
Syros (2)
-
-
-
-
Calabrian Arc (1)
-
-
Mediterranean Sea
-
East Mediterranean
-
Aegean Sea (1)
-
-
-
Mesozoic
-
Cretaceous
-
Lower Cretaceous
-
Aptian (1)
-
-
Upper Cretaceous
-
Campanian (1)
-
Cenomanian (1)
-
Hornbrook Formation (1)
-
Maestrichtian (1)
-
Senonian (2)
-
-
-
Franciscan Complex (3)
-
Great Valley Sequence (2)
-
Jurassic
-
Smartville Complex (1)
-
Upper Jurassic
-
Galice Formation (1)
-
-
-
middle Mesozoic (1)
-
Triassic
-
Lower Triassic (3)
-
Upper Triassic
-
Karmutsen Group (1)
-
-
-
-
metal ores
-
base metals (1)
-
copper ores (3)
-
gold ores (6)
-
molybdenum ores (1)
-
niobium ores (1)
-
platinum ores (1)
-
rare earth deposits (1)
-
silver ores (1)
-
tantalum ores (1)
-
-
metals
-
alkali metals
-
potassium (1)
-
rubidium
-
Rb-87/Sr-86 (2)
-
-
sodium (2)
-
-
alkaline earth metals
-
strontium
-
Rb-87/Sr-86 (2)
-
Sr-87/Sr-86 (10)
-
-
-
aluminum (1)
-
chromium (1)
-
gold (2)
-
hafnium
-
Hf-177/Hf-176 (4)
-
-
lead
-
Pb-206/Pb-204 (2)
-
Pb-207/Pb-204 (1)
-
Pb-208/Pb-204 (1)
-
-
niobium (1)
-
platinum group
-
palladium (1)
-
platinum ores (1)
-
-
precious metals (1)
-
rare earths
-
lanthanum (1)
-
lutetium (3)
-
neodymium
-
Nd-144/Nd-143 (8)
-
Sm-147/Nd-144 (4)
-
-
samarium
-
Sm-147/Nd-144 (4)
-
-
-
tantalum (1)
-
titanium (1)
-
vanadium (1)
-
zirconium (1)
-
-
metamorphic rocks
-
amphibolites
-
orthoamphibolite (2)
-
-
eclogite (16)
-
gneisses
-
granite gneiss (4)
-
orthogneiss (4)
-
paragneiss (1)
-
-
granulites
-
leptite (2)
-
-
hornfels (1)
-
jadeitite (2)
-
marbles (4)
-
metacarbonate rocks (2)
-
metaigneous rocks
-
metabasalt (5)
-
metabasite (166)
-
metadiabase (1)
-
metagabbro (5)
-
metaperidotite (1)
-
metarhyolite (1)
-
serpentinite (6)
-
-
metasedimentary rocks
-
metachert (1)
-
metagraywacke (1)
-
metapelite (21)
-
paragneiss (1)
-
-
metasomatic rocks
-
rodingite (1)
-
serpentinite (6)
-
skarn (1)
-
-
metavolcanic rocks (5)
-
migmatites (8)
-
phyllites (1)
-
quartzites (6)
-
schists
-
blueschist (9)
-
greenschist (4)
-
greenstone (2)
-
-
-
metamorphism (81)
-
metasomatism (18)
-
mineral deposits, genesis (8)
-
mineral exploration (1)
-
minerals (4)
-
noble gases
-
argon
-
Ar-39 (1)
-
Ar-40 (1)
-
-
-
North America
-
Appalachians
-
Blue Ridge Province (1)
-
-
Canadian Shield
-
Superior Province
-
Abitibi Belt (1)
-
Wawa Belt (1)
-
-
-
Gulf Coastal Plain (1)
-
Rocky Mountains
-
U. S. Rocky Mountains
-
Tobacco Root Mountains (1)
-
-
-
Yukon-Tanana Terrane (1)
-
-
orogeny (14)
-
oxygen
-
O-18/O-16 (4)
-
-
Pacific Ocean
-
East Pacific
-
East Pacific Rise (1)
-
-
North Pacific
-
Northwest Pacific
-
Izu-Bonin Arc (1)
-
-
-
West Pacific
-
Northwest Pacific
-
Izu-Bonin Arc (1)
-
-
-
-
paleogeography (5)
-
paleomagnetism (1)
-
Paleozoic
-
Cambrian
-
Lower Cambrian (4)
-
Upper Cambrian (2)
-
-
Carboniferous
-
Lower Carboniferous
-
Dinantian (1)
-
-
Mississippian
-
Middle Mississippian
-
Visean (1)
-
-
-
Upper Carboniferous (1)
-
-
Devonian
-
Lower Devonian (1)
-
Middle Devonian (1)
-
Upper Devonian (1)
-
-
lower Paleozoic
-
Ashe Formation (1)
-
-
middle Paleozoic (2)
-
Ordovician
-
Lower Ordovician
-
Arenigian (1)
-
-
Middle Ordovician (2)
-
Upper Ordovician (1)
-
-
Permian
-
Lower Permian (2)
-
-
Shoo Fly Complex (1)
-
Silurian
-
Middle Silurian (1)
-
Upper Silurian (1)
-
-
upper Paleozoic
-
Garhwal Group (1)
-
-
-
paragenesis (12)
-
petrology (24)
-
phase equilibria (20)
-
plate tectonics (32)
-
Precambrian
-
Archean
-
Neoarchean (2)
-
-
Biwabik Iron Formation (1)
-
Delhi Supergroup (1)
-
Gunflint Iron Formation (1)
-
Kingston Peak Formation (1)
-
Pahrump Series (1)
-
Spuhler Peak Formation (1)
-
upper Precambrian
-
Proterozoic
-
Mesoproterozoic (3)
-
Neoproterozoic
-
Brioverian (2)
-
Cryogenian (1)
-
Horsethief Creek Group (1)
-
Infracambrian (2)
-
-
Paleoproterozoic
-
Urquhart Shale (1)
-
-
-
-
-
sedimentary rocks
-
carbonate rocks
-
limestone (1)
-
-
chemically precipitated rocks
-
iron formations (1)
-
-
clastic rocks
-
argillite (1)
-
conglomerate (1)
-
marl (1)
-
sandstone (4)
-
shale (1)
-
-
-
sedimentary structures
-
planar bedding structures
-
rhythmite (1)
-
-
soft sediment deformation
-
olistoliths (1)
-
olistostromes (1)
-
-
-
sediments
-
clastic sediments
-
mud (1)
-
sand (1)
-
-
-
silicon (1)
-
South America
-
Andes
-
Central Andes (1)
-
-
Argentina (1)
-
Brazil
-
Goias Brazil (1)
-
-
Chile (2)
-
Precordillera (1)
-
-
standard materials (2)
-
stratigraphy (1)
-
structural analysis (12)
-
structural geology (1)
-
sulfur
-
S-34/S-32 (1)
-
-
tectonics (33)
-
tectonophysics (1)
-
United States
-
Alaska
-
Alaska Range (1)
-
Salcha River (1)
-
Seward Peninsula (3)
-
-
California
-
Central California (1)
-
Marin County California (1)
-
Mariposa County California (1)
-
Northern California (2)
-
San Francisco Bay region (1)
-
Sierra Nevada Batholith (1)
-
-
Idaho Batholith (1)
-
Klamath Mountains (3)
-
Maine (1)
-
Minnesota (1)
-
Montana
-
Madison County Montana
-
Tobacco Root Mountains (1)
-
-
-
New York
-
Adirondack Mountains (1)
-
-
North Carolina
-
Watauga County North Carolina (1)
-
Wilkes County North Carolina (1)
-
-
Texas
-
Brazoria County Texas (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
metabasite
Ordovician backarc setting in the Tongbai orogen, central China: Geochronological and geochemical constraints from the Erlangping metabasites Available to Purchase
Common metamorphic P-T-t history of metabasite and metapelite in the Danba Barrovian sequence (SW China): Implications for the Mesozoic tectono-thermal evolution of the eastern Tibetan Plateau Available to Purchase
Granulites of the Larba Block of the Dzhugdzhur–Stanovoi Superterrane: Reconstruction of the Formation Conditions Available to Purchase
Pyrite stability and chalcophile element mobility in a hot Eocene forearc of the Pacific Rim Terrane, Vancouver Island, Canada Available to Purchase
Structural, lithostratigraphic and thermal features of a Permian lower crust from the Western Italian Alps (Valpelline Series, Valle d’Aosta) Open Access
The origin of the ultrahigh-pressure Tso Morari complex, NW Himalaya: implication for early Paleozoic rifting Open Access
Zircon trace-element and isotopes (U–Pb, Lu–Hf, δ 18 O) response to fluid-deficient metamorphism of a subducted continental terrane (North Muya, Eastern Siberia) Available to Purchase
Abstract The orogenic continental crust of accretionary and collisional belts worldwide is dominated by felsic and metasedimentary rocks, which show variable responses to high-grade metamorphism. Transformation of felsic rocks is commonly limited as compared to that of the enclosed mafic rocks (including eclogites sensu stricto), which is widely attributed to availability of H 2 O–CO 2 fluids, kinetically controlled growth of high-grade assemblages, and their preferential preservation in metabasites more competent to rehydration. We report on the results of studies of the geochemical behaviour of zircon (trace-element, U–Pb, Lu–Hf and δ 18 O) in three felsic samples (two metagranitoids and one paragneiss), which are spatially (geographically and at the outcrop-scale) juxtaposed with mafic eclogites within the North Muya block (Neoproterozoic Baikalides, northern Central Asian Orogenic Belt). The data imply that metagranitoids and metasediments within the buried continental lithosphere might follow a single subduction-related P – T – t trend, whereas contrasting degrees of mineralogical and zircon transformation were governed by mineral buffer reactions in the absence of external fluids. The latter was significant only in an H 2 O-enriched protolith of metasediments. The formation of 18 O-depleted zircon recrystallization rims together with Mn enrichment of garnet rims indicate a distinct metamorphic stage without or with minor localized fluid infiltration, most likely, related to peak temperature conditions during collision.
Expanding the metamorphic devolatilization model: Komatiites as a source for orogenic gold deposits in high-grade metamorphic rocks Open Access
Early Permian Adakites of the Nora–Sukhotino Terrane in the East of the Central Asian Orogenic Belt: Geochronological (U–Pb, LA-ICP-MS) and Geochemical Data Available to Purchase
Metamorphic evolution of the Sittampundi Layered Complex, India, during the Archaean–Proterozoic boundary: insight from pseudosection modelling and zircon U–Pb SHRIMP geochronology Available to Purchase
Permeability of subducted oceanic crust revealed by eclogite-facies vugs Available to Purchase
Electron Backscatter Diffraction Study of Ultrahigh-Pressure Tso Morari Eclogites (Trans-Himalayan Collisional Zone): Implications for Strain Regime Transition from Constrictional to Plane Strain during Exhumation Open Access
Early Paleozoic Cascadia-type active-margin evolution of the Dunhuang block (NW China): Geochemical and geochronological constraints Available to Purchase
Building a continental arc section: Constraints from Paleozoic granulite-facies metamorphism, anatexis, and magmatism in the northern margin of the Qilian Block, northern Tibet Plateau Available to Purchase
Tectonic significance of the Variscan suture between Brunovistulia and the Bohemian Massif Available to Purchase
Geochemistry, Sm–Nd, Rb–Sr, and Lu–Hf Isotopes, Sources, and Conditions of Formation of Early Paleozoic Plagiogranitoids in the South of the Lake Zone in Western Mongolia Available to Purchase
Separating multiple episodes of partial melting in polyorogenic crust: An example from the Haiyangsuo complex, northern Sulu belt, eastern China Available to Purchase
Review of mid-Mesozoic to Paleogene evolution of the northern and central Californian accretionary margin Available to Purchase
ABSTRACT Spatial distributions of widespread igneous arc rocks and high-pressure–low-temperature (HP/LT) metamafic rocks, combined with U-Pb maximum ages of deposition from detrital zircon and petrofacies of Jurassic–Miocene clastic sedimentary rocks, constrain the geologic development of the northern and central Californian accretionary margin: (1) Before ca. 175 Ma, transpressive plate subduction initiated construction of a magmatic arc astride the Klamath-Sierran crustal margin. (2) Paleo-Pacific oceanic-plate rocks were recrystallized under HP/LT conditions in an east-dipping subduction zone beneath the arc at ca. 170–155 Ma. Stored at depth, these HP/LT metamafic blocks returned surfaceward mainly during mid- and Late Cretaceous time as olistoliths and tectonic fragments entrained in circulating, buoyant Franciscan mud-matrix mélange. (3) By ca. 165 Ma and continuing to at least ca. 150 Ma, erosion of the volcanic arc supplied upper-crustal debris to the Mariposa-Galice and Myrtle arc-margin strata. (4) By ca. 140 Ma, the Klamath salient had moved ~80–100 km westward relative to the Sierran arc, initiating a new, outboard convergent plate junction, and trapping old oceanic crust on the south as the Great Valley Ophiolite. (5) Following end-of-Jurassic development of a new Farallon–North American east-dipping plate junction, terrigenous debris began to accumulate as the seaward Franciscan trench complex and landward Great Valley Group plus Hornbrook forearc clastic rocks. (6) Voluminous deposition and accretion of Franciscan Eastern and Central belt and Great Valley Group detritus occurred during vigorous Sierran igneous activity attending rapid, nearly orthogonal plate subduction starting at ca. 125 Ma. (7) Although minor traces of Grenville-age detrital zircon occur in other sandstones studied in this report, they are absent from post–120 Ma Franciscan strata. (8) Sierra Nevada magmatism ceased by ca. 85 Ma, signaling transition to subhorizontal eastward underflow attending Laramide orogeny farther inland. (9) Exposed Paleogene Franciscan Coastal belt sandstone accreted in a tectonic realm unaffected by HP/LT recrystallization. (10) Judging by petrofacies and zircon U-Pb ages, Franciscan Eastern belt rocks contain clasts derived chiefly from the Sierran and Klamath ranges. Detritus from the Sierra Nevada ± Idaho batholiths is present in some Central belt strata, whereas clasts from the Idaho batholith, Challis volcanics, and Cascade igneous arc appear in progressively younger Paleogene Coastal belt sandstone.