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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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Tanzania (1)
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Asia
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Far East
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China (1)
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Australasia
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Australia
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Arunta Inlier (1)
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South Australia
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Gawler Craton (1)
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Western Australia
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Halls Creek Orogen (3)
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Europe
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Western Europe
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Scandinavia
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Finland (1)
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Kimberley Basin (2)
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North Australian Craton (1)
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commodities
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graphite deposits (1)
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metal ores
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base metals (1)
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copper ores (2)
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nickel ores (2)
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platinum ores (1)
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mineral deposits, genesis (1)
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mineral exploration (2)
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elements, isotopes
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halogens (1)
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metals
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nickel (1)
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platinum group
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platinum ores (1)
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geochronology methods
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geologic age
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Archean (1)
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upper Precambrian
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Proterozoic
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Paleoproterozoic
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igneous rocks
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igneous rocks
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plutonic rocks
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gabbros (1)
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metamorphic rocks
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metamorphic rocks
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granulites (1)
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metaigneous rocks
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metabasite (1)
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migmatites (1)
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minerals
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phosphates
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apatite (1)
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silicates
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orthosilicates
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nesosilicates
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olivine group
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olivine (1)
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sulfides (2)
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Primary terms
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Africa
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East Africa
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Tanzania (1)
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Asia
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Far East
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China (1)
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Australasia
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Australia
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Arunta Inlier (1)
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South Australia
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Gawler Craton (1)
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Western Australia
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Halls Creek Orogen (3)
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crust (1)
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data processing (1)
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economic geology (1)
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geochemistry (1)
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geophysical methods (2)
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government agencies
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graphite deposits (1)
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igneous rocks
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plutonic rocks
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gabbros (1)
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intrusions (2)
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magmas (3)
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metal ores
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base metals (1)
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copper ores (2)
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nickel ores (2)
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platinum ores (1)
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metals
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nickel (1)
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platinum group
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platinum ores (1)
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metamorphic rocks
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granulites (1)
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metaigneous rocks
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metabasite (1)
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migmatites (1)
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pollution (1)
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upper Precambrian
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Proterozoic
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tectonics (2)
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Nickel in olivine as an exploration indicator for magmatic Ni-Cu sulfide deposits: A data review and re-evaluation
Abstract An integrated interpretation of the east Kimberley, northern Western Australia was completed to determine mineral prospectivity, and was centred on a portion of a magnetotelluric (MT) survey conducted across the entire Kimberley Craton and surrounding orogens. A structural geophysical interpretation used potential field data, and was constrained by geological field observations, petrophysics, remote sensing and understanding of the tectonic history of the region. Potential field forward modelling located along the same survey traverse as the MT data allowed comparison between the two datasets and their interpretations revealing interesting features suggesting the presence of large-scale structures, the presence of mineralization deep in the crust, and where mineralization may be at or near the surface. The King River Fault is shown from both the MT inversion and potential field modelling as a crustal-scale, west-dipping structure, the footwall of which bounds the western side of a large resistive body. A conductive anomaly is also located on the hanging wall of the King River Fault. Our assessment suggests that graphitic rocks, most likely with some sulphide content, contribute to the strength of this anomaly, and highlights the potential of the east Kimberley to host graphite and base metal deposits.
Australia and Nuna
Abstract The Australian continent records c. 1860–1800 Ma orogenesis associated with rapid accretion of several ribbon micro-continents along the southern and eastern margins of the proto-North Australian Craton during Nuna assembly. The boundaries of these accreted micro-continents are imaged in crustal-scale seismic reflection data, and regional gravity and aeromagnetic datasets. Continental growth ( c. 1860–1850 Ma) along the southern margin of the proto-North Australian Craton is recorded by the accretion of a micro-continent that included the Aileron Terrane (northern Arunta Inlier) and the Gawler Craton. Eastward growth of the North Australian Craton occurred during the accretion of the Numil Terrane and the Abingdon Seismic Province, which forms part of a broader zone of collision between the northwestern margins of Laurentia and the proto-North Australian Craton. The Tickalara Arc initially accreted with the Kimberley Craton at c. 1850 Ma and together these collided with the proto-North Australian Craton at c. 1820 Ma. Collision between the West Australian Craton and the proto-North Australian Craton at c. 1790–1760 Ma terminated the rapid growth of the Australian continent.