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Geological Society, London, Special Publications; 2009; v. 318; p. 329-349;
DOI: 10.1144/SP318.12
© 2009 Geological Society of London

Articles

Palaeozoic Lachlan orogen, Australia; accretion and construction of continental crust in a marginal ocean setting: isotopic evidence from Cambrian metavolcanic rocks

David A. Foster1,*, David R. Gray2, Catherine Spaggiari3, George Kamenov1 & Frank P. Bierlein4

1 Department of Geological Sciences, University of Florida, Gainesville, FL 32611-2120, USA
2 School of Earth Sciences, University of Melbourne, Melbourne, Vic. 3010, Australia
3 Geological Survey of Western Australia, 100 Plain Street, East Perth, WA 6004, Australia
4 University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia

* Corresponding author (e-mail: dafoster{at}ufl.edu)

The Lachlan orogen developed as a classic accretionary orogen in an oceanic setting between the palaeo-Pacific subduction zone and the Australian craton. Direct evidence for the composition and age of the lower crust and the basement to the thick Palaeozoic turbidite fan of the Lachlan orogen is limited. Exposures of Cambrian metavolcanic rocks and geophysical data suggest that most of the basement is the mafic oceanic crust along with possible small fragments of older continental crust. The trace element compositions of Cambrian metavolcanic rocks in the western and central Lachlan orogen are similar to those of volcanic rocks formed in modern back-arc and forearc settings. Pb, Nd and Sr isotopic data from these Cambrian rocks suggest a supra-subduction zone setting with little or no influence of continental crust other than subducted sediment.





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P. A. Cawood, A. Kroner, W. J. Collins, T. M. Kusky, W. D. Mooney, and B. F. Windley
Accretionary orogens through Earth history
Geological Society, London, Special Publications, 2009; 318: 1 - 36.
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