Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5784179 | Lithos | 2017 | 59 Pages |
Abstract
This new isotopic and geochemical data shows that the Madura and Coompana regions together represent a huge tract of predominantly juvenile material. Magma sources recognised, include; 1) depleted mantle, producing MORB-like crust at c. 1950Â Ma, but also contributing to younger magmatism; 2) recycled c. 1950Â Ma crust reworked in primitive arcs and in intra-plate settings and; 3) minor evolved material representing fragments of hyperextended continent. The observed isotopic evolution pattern is comparable to that of other central Australian Proterozoic provinces, including the Musgrave Province, the northern margin of the Gawler Craton, and components within the Rudall Province. Linking these isotopic signatures defines the Mirning Ocean, and its subducted and underplated equivalents. In a global context we suggest c. 1950Â Ma crust production reflects the onset of ordered oceanic spreading centres, which swept juvenile crustal fragments into Nuna.
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Earth and Planetary Sciences
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Authors
C.L. Kirkland, R.H. Smithies, C.V. Spaggiari, M.T.D. Wingate, R. Quentin de Gromard, C. Clark, N.J. Gardiner, E.A. Belousova,