Characterisation of a plume-related approximately 800 Ma magmatic event and its implications for basin formation in central-southern Australia

Details Characterisation of a plume-related approximately 800 Ma magmatic event and its implications for basin formation in central-southern Australia Characterisation of a plume-related approximately 800 Ma magmatic event and its implications for basin formation in central-southern Australia

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.121..349z&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 121, no. 3/4, p. 349-367

Computer Science

22

Australia, Basalt, Earth Crust, Magma, Plumes, Structural Basins, Geochemistry, Neodymium Isotopes, Subsidence, Tectonics, Volcanology

Scientific paper

Geochemcal and Nd isotopic studies are reported for widespread Late Proterozoic (approximately 800 Ma) mafic dyke swarms and volcanics in central-southern Australia. These mafic suites, although occurring over a large area of greater than 1000 km, show remarkably uniform geochemical and isotopic features characterised by similar trace element distribution patterns, smooth LREE-enriched patterns, and a limited range of epsilon(Nd) (800 Ma) values (+2.4 to +4.2), closely resembling the Hawaiian basalts and the high-Ti Karoo flood basalts. These features suggest that this mafic province was probably derived by decompressional melting of a large-scale, uniform asthenospheric mantle plume. Upwelling of the plume resulted in domal uplift of the continental lithosphere, aulacogen-type rifting and onset of flood basalt volcanism. Large-scale crustal extension and thinning followed by thermal subsidence as a result of the plume activity may have been reponsible for the formation of the large sedimentary basins in central-southern Australia.

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