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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Alpine Fault (1)
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Antarctica
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Victoria Land
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Wilson Terrane (1)
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Australasia
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Australia
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Adelaide Geosyncline (1)
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New South Wales Australia (1)
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South Australia (1)
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Victoria Australia (1)
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New Zealand
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Nelson New Zealand (1)
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Southland New Zealand
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Fiordland National Park (3)
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Westland New Zealand (1)
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Europe
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Western Europe
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United Kingdom
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Great Britain
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Scotland
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Scottish Highlands (1)
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-
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Pacific region (2)
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South Island (5)
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elements, isotopes
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isotope ratios (1)
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isotopes
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stable isotopes
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Sr-87/Sr-86 (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 (1)
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geochronology methods
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K/Ar (1)
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Th/U (1)
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U/Pb (5)
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uranium disequilibrium (1)
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geologic age
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Dalradian (1)
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Mesozoic
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Cretaceous (2)
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Jurassic (1)
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lower Mesozoic (1)
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Triassic
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Upper Triassic (1)
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-
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Paleozoic
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Cambrian
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Kanmantoo Group (3)
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Lower Cambrian (2)
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lower Paleozoic (3)
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Ordovician (1)
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Permian (1)
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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 (1)
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Neoproterozoic
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Burra Group (1)
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Wilpena Group (1)
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Umberatana Group (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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diorites
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plagiogranite (1)
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gabbros (1)
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ultramafics (2)
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ophiolite (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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metaigneous rocks
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metatuff (1)
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metasedimentary rocks (2)
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mylonites (1)
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ophiolite (1)
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minerals
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (5)
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Primary terms
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absolute age (8)
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Antarctica
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Victoria Land
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Wilson Terrane (1)
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-
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Australasia
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Australia
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Adelaide Geosyncline (1)
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New South Wales Australia (1)
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South Australia (1)
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Victoria Australia (1)
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New Zealand
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Nelson New Zealand (1)
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Southland New Zealand
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Fiordland National Park (3)
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Westland New Zealand (1)
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-
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crust (1)
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deformation (1)
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Europe
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Western Europe
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United Kingdom
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Great Britain
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Scotland
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Scottish Highlands (1)
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-
-
-
-
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faults (2)
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geochronology (1)
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igneous rocks
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plutonic rocks
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diorites
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plagiogranite (1)
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gabbros (1)
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ultramafics (2)
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-
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intrusions (1)
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isotopes
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stable isotopes
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Sr-87/Sr-86 (1)
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-
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Mesozoic
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Cretaceous (2)
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Jurassic (1)
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lower Mesozoic (1)
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Triassic
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Upper Triassic (1)
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-
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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 (1)
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-
-
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metamorphic rocks
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gneisses
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orthogneiss (1)
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metaigneous rocks
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metatuff (1)
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metasedimentary rocks (2)
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mylonites (1)
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metamorphism (3)
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orogeny (3)
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Pacific region (2)
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paleogeography (2)
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Paleozoic
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Cambrian
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Kanmantoo Group (3)
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Lower Cambrian (2)
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lower Paleozoic (3)
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Ordovician (1)
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Permian (1)
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upper Paleozoic (1)
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petrology (3)
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plate tectonics (3)
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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 (1)
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Neoproterozoic
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Burra Group (1)
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Wilpena Group (1)
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Umberatana Group (1)
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sedimentary rocks
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clastic rocks
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tillite (1)
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tectonics (2)
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rock formations
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Torlesse Supergroup (1)
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sedimentary rocks
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sedimentary rocks
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clastic rocks
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tillite (1)
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Abstract Mafic and ultramafic rocks intercalated with metamorphosed deep-marine sediments in the Glenelg River Complex of SE Australia comprise variably tectonized fragments of an interpreted late Neoproterozoic–earliest Cambrian hyper-extended continental margin that was dismembered and thrust westwards over the adjacent continental margin during the Cambro-Ordovician Delamerian Orogeny. Ultramafic rocks include serpentinized harzburgite of inferred subcontinental lithospheric origin that had already been exhumed at the seafloor before sedimentation commenced, whereas mafic rocks exhibit mainly enriched- and normal-type mid-ocean ridge basalt (E- and N-MORB) compositions consistent with emplacement in an oceanic setting. These lithologies and their metasedimentary host rocks predate deposition of the Cambrian Kanmantoo Group and are more likely to represent temporal equivalents of the older Normanville Group or underlying Neoproterozoic Adelaide Supergroup. The Kanmantoo Group is host to basaltic rocks with higher degrees of crustal contamination and yields detrital zircon populations dominated by 600–500 Ma ages. Except for quartz greywacke confined to the uppermost part of the sequence, metasedimentary rocks in the Glenelg River Complex are devoid of detrital zircon, and are interstratified with subordinate amounts of metachert and carbonaceous dolomitic slate suggestive of deposition in a deep-marine environment far removed from any continental margin. Seismic reflection data support the idea that the Glenelg River Complex is underlain by mafic and ultramafic rocks, and preclude earlier interpretations based on aeromagnetic data that the continental margin incorporates a thick pile of seawards-dipping basaltic flows analogous to those of volcanic margins in the North Atlantic. Correlative hyper-extended continental rift margins to the Glenelg River Complex occur along strike in formerly contiguous parts of Antarctica. Supplementary material: Geochemical data for mafic and ultramafic rocks in the Glenelg River Complex and correlative terranes, and U–Th–Pb data for western Victoria gabbros are available at http://www.geolsoc.org.uk/SUP18821