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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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North Africa
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Algeria
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Ahaggar (1)
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West Africa
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Mauritanides (1)
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Asia
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Middle East
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Cyprus (3)
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Blue Mountains (1)
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Cache Creek Terrane (2)
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Canada
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Stikinia Terrane (1)
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Western Canada
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British Columbia (1)
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Canadian Cordillera (2)
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Caribbean region
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West Indies
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Antilles
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Greater Antilles
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Cuba (1)
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Mexico
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Guerrero Mexico (1)
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North America
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North American Cordillera
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Canadian Cordillera (2)
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Slide Mountain Terrane (1)
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Sierra Nevada (3)
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South America
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Andes
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Eastern Cordillera (1)
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Ecuador (1)
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United States
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California
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Del Norte County California (1)
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Nevada County California (2)
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Northern California (4)
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Plumas County California (2)
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Shasta County California
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West Shasta mining district (1)
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Sierra County California (2)
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Siskiyou County California (1)
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Trinity Complex (1)
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Idaho (1)
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Klamath Mountains (5)
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Oregon (1)
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commodities
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metal ores
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copper ores (1)
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polymetallic ores (1)
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pyrite ores (1)
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zinc ores (1)
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mineral deposits, genesis (1)
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elements, isotopes
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chemical ratios (1)
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isotope ratios (3)
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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stable isotopes
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Nd-144/Nd-143 (4)
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O-18/O-16 (1)
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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Sr-87/Sr-86 (3)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (3)
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lead
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (4)
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oxygen
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O-18/O-16 (1)
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fossils
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Invertebrata
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Cnidaria
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Anthozoa (1)
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Protista
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Radiolaria (1)
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microfossils
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geochronology methods
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geologic age
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Paleozoic
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Devonian
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Permian (2)
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igneous rocks
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igneous rocks
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volcanic rocks
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andesites (4)
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basalts
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ocean-island basalts (2)
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shoshonite (1)
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tholeiite (1)
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tholeiitic basalt (1)
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latite (1)
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trachytes (1)
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ophiolite (2)
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metapelite (1)
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metavolcanic rocks (4)
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schists (1)
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ophiolite (2)
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minerals
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sulfides (1)
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Primary terms
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absolute age (1)
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Africa
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North Africa
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Algeria
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Ahaggar (1)
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West Africa
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Mauritanides (1)
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Asia
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Middle East
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Cyprus (3)
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Canada
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Stikinia Terrane (1)
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Western Canada
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British Columbia (1)
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Canadian Cordillera (2)
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Caribbean region
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West Indies
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Antilles
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Cuba (1)
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crust (4)
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economic geology (1)
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faults (2)
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folds (1)
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geochemistry (12)
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igneous rocks
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volcanic rocks
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andesites (4)
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basalts
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mid-ocean ridge basalts (4)
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ocean-island basalts (2)
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shoshonite (1)
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tholeiite (1)
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tholeiitic basalt (1)
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latite (1)
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rhyolites (3)
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trachyandesites (1)
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trachytes (1)
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intrusions (1)
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Invertebrata
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Cnidaria
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Anthozoa (1)
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Protista
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Foraminifera (1)
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Radiolaria (1)
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isotopes
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radioactive isotopes
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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stable isotopes
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Nd-144/Nd-143 (4)
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O-18/O-16 (1)
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (1)
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Sr-87/Sr-86 (3)
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lava (6)
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magmas (4)
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mantle (5)
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Mesozoic
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Cretaceous
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Lower Cretaceous (1)
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Jurassic
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lower Mesozoic (1)
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Triassic
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metal ores
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copper ores (1)
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polymetallic ores (1)
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pyrite ores (1)
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zinc ores (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (3)
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-
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lead
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Pb-206/Pb-204 (2)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
-
-
rare earths
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neodymium
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Nd-144/Nd-143 (4)
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metamorphic rocks
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amphibolites (1)
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eclogite (1)
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marbles (1)
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metaigneous rocks
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metabasalt (1)
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metasedimentary rocks
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metapelite (1)
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metavolcanic rocks (4)
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schists (1)
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metamorphism (2)
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Mexico
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Guerrero Mexico (1)
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mineral deposits, genesis (1)
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North America
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North American Cordillera
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Canadian Cordillera (2)
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Slide Mountain Terrane (1)
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ocean floors (1)
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orogeny (1)
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oxygen
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O-18/O-16 (1)
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paleogeography (2)
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Paleozoic
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Devonian
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Lower Devonian (2)
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Middle Devonian
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Balaklala Rhyolite (3)
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Copley Greenstone (2)
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Permian (2)
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Silurian (1)
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upper Paleozoic (1)
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petrology (2)
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plate tectonics (11)
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Precambrian
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upper Precambrian
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Neoproterozoic (1)
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sea-floor spreading (1)
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clastic rocks (2)
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Ecuador (1)
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United States
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California
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Del Norte County California (1)
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Nevada County California (2)
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Northern California (4)
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Plumas County California (2)
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Shasta County California
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West Shasta mining district (1)
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Sierra County California (2)
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Siskiyou County California (1)
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Trinity Complex (1)
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Idaho (1)
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Klamath Mountains (5)
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Oregon (1)
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volcanology (2)
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rock formations
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Troodos Ophiolite (1)
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sedimentary rocks
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flysch (1)
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sedimentary rocks
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carbonate rocks
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limestone (1)
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clastic rocks (2)
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volcaniclastics (1)
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sediments
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sediments (1)
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volcaniclastics (1)
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The Mamonia Complex (SW Cyprus) revisited: remnant of Late Triassic intra-oceanic volcanism along the Tethyan southwestern passive margin
Le terrane de Slide Mountain (Cordillères canadiennes): une lithosphère océanique marquée par des points chauds
Geochemistry of the Mabujina Complex, Central Cuba: Implications on the Cuban Cretaceous Arc Rocks
Imbricate architecture of the upper Paleozoic to Juraic oceanic Cache Creek Terrane, central British Columbia
The influence of mantle plume in the genesis of the Cache Creek oceanic igneous rocks: implications for the geodynamic evolution of the inner accreted terranes of the Canadian Cordillera
Geochemical window into subduction and accretion processes: Raspas metamorphic complex, Ecuador
Caractérisation, genèse et évolution géodynamique du terrain de Guerrero (Mexique occidental)
La Sequence volcanique et volcanoclastique de Mills Peak, fragment d'un volcan sous-marin dans l'arc paleozoique du nord de la Sierra Nevada, Californie
Petrogenesis of magmas at a fossil slow-spreading center; the Trinity Ophiolite (Northern California, USA)
Rocks in the eastern Klamath Mountains were affected by polyphase tectonism. The older Callahan tectonic event, of Late Ordovician–Early Silurian age, produced high-pressure and epizonal metamorphism and is expressed in the Yreka-Callahan nappes by intrafolial folds. The main tectonic event occurred during Late Devonian and Early Mississippian time and is interpreted here to be coeval with the Antler orogeny, defined in the Roberts Mountain allochthon to the east in Nevada. It resulted in the amalgamation of lower Paleozoic Trinity ophiolite and the pre-Devonian to Early Devonian intra-oceanic island arc with flysch-type sediments deposited in a continent margin (Yreka-Callahan assemblage), and a metamorphic sequence of amphibolite, marble, and quartz-mica-schist of the Central Metamorphic Belt. The magmatic evolution of Paleozoic and lower Mesozoic rocks in the eastern Klamath Mountains is characterized by the predominance of convergent plate boundary magmatism. Nevertheless, lower Paleozoic pillow basalts associated with coralline limestone occur as olistoliths in the Yreka-Callahan assemblage. They display either T mid-ocean ridge basalt (MORB) affinities with flat rare earth element (REE) patterns or mild alkalic affinities marked by higher contents in TiO 2 and HFS elements and LREE-enriched patterns. The Ashgillian calc-alkaline differentiated suite, characterized by LREE-enriched patterns and low ɛ Nd (T) + 3.5, was erupted through continental crust in an Andean margin setting. The pre-Devonian to Early Devonian volcanic rocks that show tholeiitic affinities with very depleted to somewhat enriched LREE patterns and high ∊ Nd (T) values represent the remnants of an intra-oceanic immature island arc. After the Late Devonian(?)–Early Mississippian tectonic event, island-arc magmatism resumed with the eruption of depleted low-K tholeiitic basalt and andesite, characterized by depleted LREE patterns during Late Devonian(?) or Carboniferous-Permian(?) time (Gregg Ranch and Copper Peak sections). A major pulse in volcanism occurred during Middle to Late Permian and is now represented by the voluminous sequence of volcanogenic debris and flows of the Nosoni, Dekkas, and Bully Hill Formations. This volcanism, formed of predominantly low-K tholeiitic basalt and andesite, characterized by flat REE patterns and high ɛ Nd (T) + 4 to 8, with minor calc-alkaline, alkaline (enriched LREE patterns), and boninitic (Mg-Cr-rich) basalts, was erupted through a thickened crust. At the end of the Permian island-arc volcanism, uplift and faulting occurred in the arc. The magmatic affinities of the middle to late Paleozoic volcanic rocks in the eastern Klamath Mountains suggest an evolution through time from an immature to a mature island-arc setting. The Permian-Triassic history of the Blue Mountains (Seven Devils Group; Huntington Formation) presents many similarities with that of the eastern Klamath terrane. In both areas, evidence for Permian volcanism is similar with flat REE patterns and high ɛ Nd (T) + 6.7 to 8.4. Triassic volcanic rocks display low-K tholeiitic affinities (flat REE patterns) with minor calc-alkaline flows in the uppermost levels of the volcanic pile. Apparently, compressive structures related to the Sonoma orogeny are absent in both areas. Thus the eastern Klamath and Blue Mountains could have formed part of the same arc in Permian-Triassic time.