Journal
AUSTRALIAN JOURNAL OF EARTH SCIENCES
Volume 52, Issue 2, Pages 243-260Publisher
BLACKWELL PUBLISHING
DOI: 10.1080/08120090500139448
Keywords
basalt; Cenozoic; geochemistry; intraplate magmatism; isotopes; mantle heterogeneity; trace elements; Victoria; volcanic rocks
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Volcanic rocks in central Victoria play a key role in unravelling magmatic relationships within an extensive zone of Late Mesozoic to Quaternary volcanism in southeastern Australia. In this study, new bulk-rock major, trace-element and Sr, Nd, Hf and Pb isotope data are presented for 20 samples of Late Cenozoic mafic volcanics from the central Victorian region. Mineral chemistry and bulk-rock analyses confirm that all samples can be treated as liquid compositions and that some were probably primary magmas. On the basis of incompatible trace-element and isotope ratios, processes such as magma mixing and crustal assimilation con be largely ruled out, and significant mantle-source heterogeneity beneath the area is proposed, If this heterogeneity extends to other regions of the post-10 Ma Victorian volcanics, the influence of the Mortlake Discontinuity and level of involvement from the lithospheric mantle in the genesis of these rocks, may need to be re-evaluated. Finally, it is argued that there is no clear evidence to suggest the New South Wales leucitite suite extends into Victoria; rather the Cosgrove leucitite flow represents part of the post-10 Ma Victorian volcanics.
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