Multi-age trachytic eruptions, Western Victoria: plume-related?

Lin Sutherland; Ian Graham; Julian Hollis

doi:10.1071/ASEG2006ab171

ISSN: 2202-0586
E-ISSN:

oa Multi-age trachytic eruptions, Western Victoria: plume-related?
Authors Lin Sutherland^a, Ian Graham^b and Julian Hollis^c
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^a Geoscience, The Australian Museum, 6 College St, Sydney, , NSW, 2010, [email protected] ^b Geoscience, The Australian Museum, 6 College St, Sydney, , NSW, 2010, [email protected] ^c Geoscience, The Australian Museum, 6 College St, Sydney, , NSW, 2010
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2006ab171
- Published online: 01 Dec 2006

Abstract

Although basaltic products dominate post-5 Ma western Victorian volcanism, a revised picture suggests basaltic activity extended back to 8 Ma and was punctuated by felsic episodes around 8, 6 and 2 Ma. The 8 Ma episode produced rhyolite (8.3 ± 0.1 Ma), zircon-bearing tuff (8.1 – 8.3 ± 0.5 Ma) and derived zircon-bearing sediments (8.1 ± 0.6 Ma). The 6 Ma episode formed the prominent trachytes of the Macedon-Trentham province (5.9 – 6.1 Ma) and provided zircon at depth for subsequent basaltic megacrysts. The 2 Ma episode is the first felsic outcrop identified in the main basaltic sequence and a trachyte plug near Creswick gives congruent K-Ar, Ar-Ar and zircon fission-track ages at 2.4 ± 0.4 Ma. The Creswick plug is a porphyritic, metaluminous potassic-sodic trachyte and each felsic episode shows petrological differences. The youngest felsic event may explain distal bentonite deposits in south-western New South Wales.

Triple episodes of felsic fractionation during western Victorian basaltic activity requires a more complex genetic model for its formation. It raises the question of multiple plume-related mantle melting events.

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References

Edwards, J., Cayley, R.A., and Joyce, E.B., 2004, Geology and geomorphology of the Lady Julia Percy Island volcano, a late Miocene submarine and subaerial volcano off the coast of Victoria, Australia: Proceedings of the Royal Society of Victoria, 116, 15-35.
Graham, I.T., Hollis, J.D., Sutherland, F.L., and Joyce, E.B., 2003, Insights into the Newer Volcanic Province of Victoria: Geological Society of Australia Specialist group in geochemistry, Mineralogy and Petrology Field Guide, 5.
Mason, A.J., 2005, Arumpo bentonite, a growing force in the Australian bentonite market: Australian Industrial Minerals Conference, Sydney, 67-71.
Paul, B., Hergt, J.M., and Woodhead, J.D., 2005, Mantle heterogeneity beneath the Cenozoic volcanic provinces of central Victoria inferred from trace-element and Sr, Nd, Pb and Hf isotope data: Australian Journal of Earth Sciences, 52, 243-260.
Price, R.C., Nicholls, I.A., and Gray, C.M., 2003, Cainozoic igneous activity, IN: Birch, W.D. (ed), Geology of Victoria: geological Society of Australia Special Publication 23, p 361-375.
Sniderman, J.M.K., O’Sullivan, P.B., Hollis, J.D., and Kershaw, A.P., 2004, Late Pliocene vegetation and climatic change at Stony Creek Basin, western uplands of Victoria, Australia: Proceedings of the Royal Society of Victoria, 116, 77-92.
Sutherland, F.L., 2003, ‘Boomerang’ migratory intraplate Cenozoic volcanism, eastern Australia rift margins and the Indo-Pacific mantle boundary: Geological Society of Australia Sopecial Publication 22, and Geological Society of America Special paper 372, 203-221.
Sutherland, F.L., Graham, I.T., and Zwingmann, H., 2004, Late Cenozoic basalts, Uplands Priovince, N.E. Victoria: In relation to the Newer Volcanics basalts of western Victoria: Proceedings of the Royal Society of Victoria, 116, 51-68.

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Article Type: Research Article

Keyword(s): felsic; trachyte; western Victoria; zircon dating

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