Geochemistry and origin of felsic igneous rocks of the western Musgrave Block

Granulite facies country rocks of the Giles Complex in the western Musgrave Block are predominantly of felsic igneous (intrusive or extrusive) origin and were metamorphosed at about 1200 Ma. The protoliths of some Y -depleted orthogneisses may represent primary felsic crust derived by partial melting of a hornblende±garnet-bearing, but feldspar-poor, mafic source, whereas others (including syn-metamorphic orthopyroxene granites) have geochemical features (notably depletion in Sr, but not Y) more consistent with intracrustal melting. 1188±4 Ma and ~1060 Ma hornblende-biotite granitoids (including rapakivi varieties) south of the Hinckley Range mostly have compositions (high HFSE, LREE, and Th/U, and low Sr) consistent with relatively high-temperature partial melting of near-anhydrous granulite facies crustal rocks, at least partly caused by emplacement of mafic magmas (including the Giles Complex). Granitic basement rocks to the Bentley Supergroup in the western Musgrave Block differ from granitoids of the Hinckley Range area in including a significant proportion of Y-depleted, Sr-undepleted rocks which may represent new felsic crust. The 1078±5 Ma felsic Smoke Hill Volcanics of the Bentley Supergroup have compositions (high HFSE, LREE, and Ga/A1, and low mg) typical of A-type and intraplate granitoids. Like the Hinckley Range hornblende-biotite granitoids, they may have been derived by partial melting of granulite facies lower crustal rocks during emplacement of mantle-derived magma ( e.g., the associated Mummawarrawarra Basalt), or, alternatively, by fractionation of basaltic magma. However, the relatively high Nb of the felsic volcanics implies a source compositionally different from either the exposed felsic crustal rocks or mafic volcanics. The somewhat younger Nd TDM model ages (1460-1570 Ma) of the Smoke Hill Volcanics compared to granulite facies metamorphics west of the Hinckley Range (1610-1900 Ma) are consistent with derivation of the former either from a relatively young crustal underplate or directly from mantle-derived magma.

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1995-01-01T00:00:00
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81423

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Australian Geological Survey Organisation

 Canberra
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Sheraton, J.W.

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Sun, S.S.

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AGSO Journal of Australian Geology and Geophysics

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16:1-2:107-125

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