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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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Southern Africa
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Karoo Basin (1)
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South Africa (2)
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Arctic region
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Greenland
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South Greenland (3)
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Caledonides (3)
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Canada
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Nunavut
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Ellesmere Island (1)
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Sverdrup Basin (1)
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Sverdrup Islands
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Axel Heiberg Island (1)
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Queen Elizabeth Islands
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Ellesmere Island (1)
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Sverdrup Basin (1)
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Sverdrup Islands
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Europe
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Fennoscandia (2)
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Fennoscandian Shield (6)
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Karelia (1)
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Western Europe
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Scandinavia
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Finland (2)
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Norway
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Sweden (1)
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Oslo Rift (2)
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commodities
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elements, isotopes
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hydrogen
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isotopes
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Hf-177/Hf-176 (4)
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O-18/O-16 (2)
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lead (1)
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oxygen
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geologic age
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zircon (10)
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biotite (1)
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Primary terms
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absolute age (10)
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Africa
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Southern Africa
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Karoo Basin (1)
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South Africa (2)
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Arctic region
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Greenland
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South Greenland (3)
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Canada
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Nunavut
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Ellesmere Island (1)
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Sverdrup Basin (1)
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Sverdrup Islands
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Axel Heiberg Island (1)
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-
-
Queen Elizabeth Islands
-
Ellesmere Island (1)
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Sverdrup Basin (1)
-
Sverdrup Islands
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Axel Heiberg Island (1)
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carbon
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C-13/C-12 (1)
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Cenozoic (1)
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crust (4)
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crystal chemistry (2)
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Europe
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Fennoscandia (2)
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Fennoscandian Shield (6)
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Karelia (1)
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Western Europe
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Scandinavia
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Finland (2)
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Norway
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Oslo Graben (1)
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Southern Norway (3)
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Telemark Norway (1)
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Sweden (1)
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faults (1)
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geochemistry (2)
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hydrogen
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D/H (1)
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igneous rocks
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carbonatites (1)
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plutonic rocks
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anorthosite (1)
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granites
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A-type granites (1)
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I-type granites (1)
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rapakivi (1)
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monzonites (1)
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pegmatite (1)
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syenites
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nepheline syenite (1)
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volcanic rocks
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inclusions
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intrusions (2)
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isotopes
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O-18/O-16 (2)
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magmas (3)
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Mesozoic
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Cretaceous
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Lower Cretaceous
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Isachsen Formation (1)
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metal ores
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arsenic ores (1)
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molybdenum ores (1)
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tungsten ores (1)
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metals
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hafnium
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Hf-177/Hf-176 (4)
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lead (1)
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manganese (1)
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niobium (1)
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rare earths
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lutetium (1)
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metamorphic rocks
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gneisses (1)
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granulites (1)
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metaigneous rocks
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metagranite (1)
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metasomatic rocks
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skarn (1)
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quartzites (1)
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metamorphism (2)
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metasomatism (2)
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mineral deposits, genesis (1)
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oxygen
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O-18/O-16 (2)
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paleogeography (1)
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Paleozoic
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Carboniferous (1)
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Ordovician
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Upper Ordovician
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Hirnantian (1)
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Permian (2)
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upper Paleozoic (1)
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Precambrian
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Archean (1)
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upper Precambrian
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Proterozoic
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Mesoproterozoic (5)
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Neoproterozoic (2)
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Pretoria Group (1)
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sedimentary rocks
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carbonate rocks (1)
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clastic rocks
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shale (1)
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sedimentation (3)
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sediments (1)
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tectonics (1)
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weathering (1)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks (1)
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clastic rocks
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conglomerate (1)
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sandstone (4)
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shale (1)
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sediments
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sediments (1)
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Open-system behaviour of detrital zircon during weathering: an example from the Palaeoproterozoic Pretoria Group, South Africa
Variation in Major and Trace Elements of Primary WÖhlerite As an Indicator of the Origin of Pegmatites in the Larvik Plutonic Complex, Norway
U–Pb and Lu–Hf zircon data in young sediments reflect sedimentary recycling in eastern South Africa
The source of Proterozoic anorthosite and rapakivi granite magmatism: evidence from combined in situ Hf–O isotopes of zircon in the Ahvenisto complex, southeastern Finland
Provenance and rift basin architecture of the Neoproterozoic Hedmark Basin, South Norway inferred from U–Pb ages and Lu–Hf isotopes of conglomerate clasts and detrital zircons
Abstract The Trondheim Region ophiolites in the Mid-Norwegian Caledonides represent variably tectonized ophiolite fragments. We present high-precision thermal-ionization mass spectrometry and secondary-ion mass spectrometry (SIMS) U–Pb zircon dates, whole-rock geochemical and Sm–Nd data and Lu–Hf zircon analyses that permit the timing and nature of various stages in the evolution of the ophiolite to be elucidated. Plagiogranite intrusions dated at 487 and 480 Ma have relatively juvenile Nd and Hf isotopic compositions (ɛ Nd( t ) =6.3, ɛ Hf( t ) =8.2–12.4). Geochemical data indicate a subduction-zone influence, suggesting formation in an oceanic back-arc setting. At 481 Ma, a granitoid body with a relatively strong unradiogenic Nd and Hf isotopic composition (ɛ Nd( t ) =−2.6 to −4.0, ɛ Hf( t ) =3.8–6.4) and subduction-zone geochemical signature intruded the ophiolite. We interpret this stage to reflect the formation or migration of an oceanic arc above a subduction zone influenced by continentally derived sediments. At c. 475–465 Ma, a greenstone-dominated conglomerate and volcaniclastic sequence was deposited on the eroded ophiolite, indicating obduction between about 480 and 475 Ma. At c. 468–467 Ma, the deformed ophiolite and its sedimentary cover was intruded by trondhjemite dykes and shoshonitic volcanic rocks with intermediate Nd and Hf isotopic compositions (ɛ Nd( t ) =3.0–3.9, ɛ Hf( t ) =4.4–10.2). We interpret this magmatism to reflect subduction-polarity reversal and establishment of a magmatic arc at the continental margin shortly after obduction. Supplementary material: Whole-rock geochemistry, Sm–Nd isotopic data, SHRIMP U–Pb zircon, TIMS U–Pb zircon and Lu–Hf isotopic data are available at http://www.geolsoc.org.uk/SUP18689 .