Low-Ti Silurian-Early Devonian continental rift tholeiites and plagiogranites in the Tumut area, NSW.

Sebastien Meffre; Richard A. Glen

doi:10.1071/ASEG2006ab112

ISSN: 2202-0586
E-ISSN:

oa Low-Ti Silurian-Early Devonian continental rift tholeiites and plagiogranites in the Tumut area, NSW.
Authors Sebastien Meffre^a and Richard A. Glen^b
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^a Centre for Ore Deposit ResearchUniversity of Tasmania, Private Bag 79, Hobart, 7001, [email protected] ^b Geological Survey of New South WalesDepartment of Primary Industries, PO Box 344 Hunter Regional Mail Centre NSW, 2310, [email protected]
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/ASEG2006ab112
- Published online: 01 Dec 2006

Abstract

A suite of low-Ti Silurian to Early Devonian basaltic rock and plagiogranite in the Tumut area have previously been interpreted as back-arc tholeiitic basalt and ophiolitic rocks formed in an oceanic environment. Re-examination of these rocks and their geological contacts show that they closely resemble low-Ti continental rift tholeiites and their felsic shallow intrusive differentiation products. The mafic rocks have strong similarities to the low-Ti Jurrassic break up dolerites in Tasmania.

The basalts and intrusive rocks were probably derived from the sub-continental mantle during Silurian-Devonian rifting well after the initial emplacement of the ophiolitic rocks in the Tumut area.

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References

Ashley, P.M., Franklin, B.J. and Ray, A.S., 1983. Plagiogranites in the Coolac ophiolite suite, New South Wales, Australia. Geological Magazine 120, 1-108.
Basden, H., 1990. Geology of the Tumut 1:100 000 Sheet 8527. New South Wales Geological Survey, Sydney, New South Wales, 275 pp.
Dadd, K.A., 1998. Incipent backarc magmatism in the Silurian Tumut Trough, New South Wales: and ancient analogue of the early Lau Basn. Australian Journal of Earth Sciences 45, 109-121.
Graham, I.T., Franklin, B.J., Marshall, B., Leitch, E.C. and Fanning, M., 1996. Tectonic significance of 400 Ma Zircon ages for ophiolitic rocks from the Lachlan Fold Belt, eastern Australia. Geology 1111-1114.
Hergt, J.M., Chappell, B.W., Mcculloch, M.T., Mcdougall, I. and Chivas, A.R., 1989. Geochemical and Isotopie Constraints on the Origin of the Jurassic Dolerites of Tasmania. Journal of Petrology 30, 841-883.
Hergt, J.M., Peate, D.W. and Hawkesworth, C.J., 1991. The Petrogenesis of Mesozoic Gondwana Low-Ti Flood Basalts. Earth and Planetary Science Letters 105, 134-148.

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Article Type: Research Article

Keyword(s): Lachlan Orogen; plagiogranite; Tumut

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oa Low-Ti Silurian-Early Devonian continental rift tholeiites and plagiogranites in the Tumut area, NSW.

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