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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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East Africa
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Lake Malawi (1)
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Malawi (1)
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Sudan (1)
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East African Lakes
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Lake Malawi (1)
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North Africa
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Egypt (1)
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Southern Africa
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Zimbabwe
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Great Dyke (1)
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Asia
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Arabian Peninsula
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Arabian Shield (2)
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Saudi Arabia (2)
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Far East
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China
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Hong Kong (1)
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Europe
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Fennoscandian Shield (1)
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Western Europe
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Scandinavia
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Norway (1)
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United Kingdom
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Great Britain
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England
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Cornubian Batholith (2)
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Cornwall England
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Land's End (1)
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Devon England
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Dartmoor (1)
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South-West England (2)
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Scotland
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Highland region Scotland
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Sutherland Scotland (1)
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Tamar Valley (1)
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commodities
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metal ores
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copper ores (1)
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gold ores (1)
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iron ores (1)
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lead ores (1)
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polymetallic ores (1)
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tungsten ores (1)
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zinc ores (1)
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mineral deposits, genesis (2)
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elements, isotopes
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isotope ratios (2)
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isotopes
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radioactive isotopes
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Ar-40/Ar-39 (1)
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Sm-147/Nd-144 (1)
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stable isotopes
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Ar-40/Ar-39 (1)
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Nd-144/Nd-143 (3)
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O-18/O-16 (1)
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Sm-147/Nd-144 (1)
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Sr-87/Sr-86 (4)
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metals
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alkaline earth metals
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barium (1)
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strontium
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Sr-87/Sr-86 (4)
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rare earths
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neodymium
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Nd-144/Nd-143 (3)
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Sm-147/Nd-144 (1)
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samarium
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Sm-147/Nd-144 (1)
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noble gases
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argon
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Ar-40/Ar-39 (1)
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oxygen
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O-18/O-16 (1)
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geochronology methods
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Rb/Sr (7)
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Sm/Nd (2)
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U/Pb (1)
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geologic age
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Mesozoic
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Cretaceous (1)
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Triassic (1)
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Paleozoic
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Carboniferous (1)
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Precambrian
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Archean
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upper Precambrian
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Proterozoic
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Mesoproterozoic (2)
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Neoproterozoic (2)
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Paleoproterozoic (2)
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igneous rocks
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igneous rocks
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plutonic rocks
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appinite (1)
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diorites
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tonalite (2)
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granites
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A-type granites (1)
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I-type granites (2)
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monzogranite (1)
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granodiorites (2)
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volcanic rocks
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basalts (1)
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rhyolites (1)
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metamorphic rocks
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metamorphic rocks
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gneisses
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orthogneiss (1)
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metasedimentary rocks (1)
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metavolcanic rocks (1)
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minerals
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tungstates
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scheelite (1)
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Primary terms
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absolute age (8)
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Africa
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East Africa
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Lake Malawi (1)
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Malawi (1)
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Sudan (1)
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East African Lakes
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Lake Malawi (1)
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North Africa
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Egypt (1)
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Southern Africa
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Zimbabwe
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Great Dyke (1)
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Asia
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Arabian Peninsula
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Arabian Shield (2)
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Saudi Arabia (2)
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Far East
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China
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Hong Kong (1)
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crust (1)
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economic geology (1)
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Europe
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Fennoscandian Shield (1)
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Western Europe
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Scandinavia
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Norway (1)
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United Kingdom
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Great Britain
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England
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Cornubian Batholith (2)
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Cornwall England
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Land's End (1)
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Devon England
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Dartmoor (1)
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South-West England (2)
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Scotland
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Highland region Scotland
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Sutherland Scotland (1)
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geochemistry (4)
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geochronology (5)
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igneous rocks
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plutonic rocks
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appinite (1)
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diorites
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tonalite (2)
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granites
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A-type granites (1)
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I-type granites (2)
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monzogranite (1)
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granodiorites (2)
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volcanic rocks
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basalts (1)
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rhyolites (1)
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intrusions (4)
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isotopes
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radioactive isotopes
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Ar-40/Ar-39 (1)
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Sm-147/Nd-144 (1)
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stable isotopes
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Ar-40/Ar-39 (1)
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Nd-144/Nd-143 (3)
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O-18/O-16 (1)
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Sm-147/Nd-144 (1)
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Sr-87/Sr-86 (4)
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lava (1)
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magmas (2)
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Mesozoic
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Cretaceous (1)
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Triassic (1)
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metal ores
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copper ores (1)
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gold ores (1)
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iron ores (1)
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lead ores (1)
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polymetallic ores (1)
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tungsten ores (1)
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zinc ores (1)
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-
metals
-
alkaline earth metals
-
barium (1)
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strontium
-
Sr-87/Sr-86 (4)
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-
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rare earths
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neodymium
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Nd-144/Nd-143 (3)
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Sm-147/Nd-144 (1)
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samarium
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Sm-147/Nd-144 (1)
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metamorphic rocks
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gneisses
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orthogneiss (1)
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metasedimentary rocks (1)
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metavolcanic rocks (1)
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metamorphism (1)
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mineral deposits, genesis (2)
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noble gases
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argon
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Ar-40/Ar-39 (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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Paleozoic
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Carboniferous (1)
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petrology (4)
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phase equilibria (1)
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plate tectonics (1)
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Precambrian
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Archean
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Neoarchean (1)
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upper Precambrian
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Proterozoic
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Mesoproterozoic (2)
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Neoproterozoic (2)
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Paleoproterozoic (2)
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structural analysis (1)
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tectonics (1)
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rock formations
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Nubian Sandstone (1)
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sedimentary rocks
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volcaniclastics (2)
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sediments
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volcaniclastics (2)
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Abstract Two domains have previously been recognized in the Archaean Reguibat shield of NW Mauritania, based primarily on their gross lithological differences. New fieldwork has identified a major ductile shear zone (Tâçarât–Inemmaûdene Shear Zone) separating these domains and new geochronological studies show that the two domains record different Mesoarchaean histories. As such, the two domains are redefined as the Choum–Rag el Abiod Terrane and Tasiast–Tijirit Terrane. Previous isotopic studies of metamorphic lithologies of the eastern Choum–Rag el Abiod Terrane indicate a succession of crustal growth from about 3.5–3.45 Ga to between about 3.2 and 2.99 Ga. Isotopic data presented in this contribution from the Tasiast–Tijirit Terrane indicate that emplacement of major calc-alkaline plutons occurred at c . 2.93 Ga after volcanism (preserved as greenstone belts) that included late felsic eruptive centres dated at c . 2965 Ma. This Mesoarchaean intrusive and extrusive magmatism was confined to the Tasiast–Tijirit Terrane, where it was emplaced through migmatitic orthogneisses that are the oldest lithodemic unit of the Tasiast–Tijirit Terrane. Widespread bimodal, post-tectonic magmatism in both terranes included major granitic magmatism dated at c . 2730 Ma. The north–south- to NNE–SSW-trending curvilinear Tâçarât–Inemmaûdene Shear Zone that separates the two terranes records late intense transpressive ductile shearing. It has a flower structure over a horizontal distance of about 70 km across its southern portion with unquantifiable sinistral horizontal offset, and east-directed thrusting on its eastern side where it cuts into the Choum–Rag el Abiod Terrane. A new U–Pb zircon age of 2954±111 Ma is presented for a deformed granite confined within the central part of this shear zone. A minimum age for the shearing is provided by a previously determined c . 2.73 Ga age for a post-tectonic granite that cuts across the easternmost part of the shear zone in the Choum–Rag el Abiod Terrane.
Geochemistry of late Mesoproterozoic volcanism in southwestern Scandinavia: implications for Sveconorwegian/Grenvillian plate tectonic models
Petrogenesis of high Ba–Sr granites: the Rogart pluton, Sutherland
Late Archean and Early Proterozoic gold-tungsten mineralization in the Zimbabwe Archean craton: Rb-Sr and Sm-Nd isotope constraints
Nd and Sr isotope constraints on the origin of the Cornubian batholith, SW England
Timing and significance of crosscourse mineralization in SW England
The granites of Hong Kong comprise a variety of assemblages dominated by chemically evolved compositions. They are divided into two suites based on petrographic, geochemical, and age criteria. The oldest and most primitive intrusive units are deformed biotite-hornblende granodiorites and monzogranites of the Lamma Suite. These rocks are characterised by high CaO (1.4–2.7%), and low Nb and Y contents. The Lion Rock Suite (LRS) is dominated by relatively undeformed monzogranite with subordinate quartz syenite and comprises three subgroups. Granites of subgroup I are separated into coarse- and fine- to medium-grained lithologies. The fine- to medium-grained granites are predominantly fluorite-bearing with silica contents ranging from 75.5–78%. They are characterised by high total REE, Ga, F, Rb, Nb, and Y contents and yield a Rb–Sr whole-rock isochron age of 155 ± 6 Ma with an initial 87 Sr/ 86 Sr ratio of 0.7101 ± 0.0060 (MSWD = 4.6). Granites of subgroup II comprise a diverse range of compositions (SiO 2 = 63–77%) and are characterised by highly variable trace element abundances. Coarse-grained granites yield an age of 148 ± 9 Ma with an initial 87 Sr/ 86 Sr ratio of 0.7060 ± 0.0006 (MSWD = 0.1). Granites of subgroup III are moderately to highly evolved (SiO 2 = 72.5–77.9%) and the silica-rich compositions are marked by enrichment in Y, Nb, Rb and depletion in Ba and Sr. Rb–Sr whole-rock isochron ages for individual plutons vary from 138 ± 1 to 136 ± 1 and corresponding initial 87 Sr/ 86 Sr ratios are 0.7080 ± 0.0002 (MSWD = 1.2) and 0.7092 ± 0.0006 (MSWD = 0.4). Granites of the Lamma Suite and coarse-grained granites of LRS subgroup I are interpreted as synorogenic I-types, whereas those of LRS subgroups II and III are interpreted as late-orogenic to postorogenic, fractionated I-types. Fine-to medium-grained granites of LRS subgroup I have distinctive A-type affinities and together with their association with quartz syenite indicate a transition from compressional to tensional tectonics.