Citation

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Colwell, J.B., Symonds, P.A. & Crawford, A.J., 1994. The nature of the Wallaby (Cuvier) Plateau and other igneous provinces of the west Australian margin. AGSO Journal of Australian Geology and Geophysics  15:1:137-156. Australian Geological Survey Organisation, Canberra.

Abstract

Seismic reflection data and dredged rocks confirm that the Wallaby (Cuvier) Plateau off western Australia is underlain by a volcanic basement consisting of complex packages of dipping reflectors similar to those of other large, oceanic, igneous provinces (LIPs) of the eastern Indian Ocean, such as the Kerguelen Plateau. Wedges of seaward-dipping reflectors underlie the Wallaby Saddle, which separates the plateau from the adjacent upper continental slope. These are interpreted to be interbedded subaerial lava flows and volcaniclastics similar to those obtained by ODP drilling of like features beneath the margins of the North Atlantic Ocean. Volcanic rocks dredged from the Wallaby Plateau are altered transitional tholeiitic basalts with immobile element contents and ratios similar to basalts from the Naturaliste Plateau, eastern Broken Ridge, and the Bunbury Basalt of southern western Australia. Basalts from all of these regions show compositional features indicative of the involvement of sub-continental lithospheric mantle in their petrogenesis, and appear to have been erupted between 120 and 100 Ma as a result of an anomalous post-breakup heating event. A consistent explanation for the origin of the Wallaby Plateau, and similar large, post-breakup volcanic features (LIPs) of the eastern Indian Ocean, is that they are the product of a single, large hotspot (Kerguelen hotspot or mantle plume). However, for the Wallaby Plateau and its associated Sonne and Sonja Ridges there is another possible origin, that they are the products of convective partial melting following a ridge crest jump in the Cuvier Abyssal Plain. The distribution of other volcanic features of the western Australian margin can be readily explained by magmatism associated with dynamic rift processes rather than proximity to a plume.
Google map showing geographic bounding box with values North bound -5.7 East bound 126.6 West bound 104.89 South bound -41.12
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Creative Commons Attribution 4.0 International Licence

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Date (publication)

1994

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GA Publication
Journal
Earth Sciences

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English

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North bound
-5.7
East bound
126.6
West bound
104.89
South bound
-41.12

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Unknown

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pdf

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2015-03-23

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