Citation

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Ballhaus, C. & Glikson, A.Y., 1995. The petrology of layered mafic-ultramafic intrusions of the Giles Complex, western Musgrave Block, Western Australia. AGSO Journal of Australian Geology and Geophysics  16:1-2:69-89. Australian Geological Survey Organisation, Canberra.

Abstract

The Musgrave Block hosts about twenty major layered intrusions and several generations of compositionally diverse sills and dykes collectively referred to as the Giles Igneous Complex. All were emplaced in middle Proterozoic intermediate to felsic granulites and amphibolites. On the basis of crystallisation sequences within the cumulates, we distinguish between (1) ultramafic olivine-clinopyroxene rich cumulate sequences, (2) mafic clinopyroxene-plagioclase-rich sequences, and (3) evolved troctolitic olivine-plagioclase ± magnetite-rich sequences. The layered igneous rocks are intruded by several generations of dykes, whose phenocryst assemblages resemble the crystallisation sequences in the cumulates. On this basis, at least three discrete parental melt compositions are identified, namely (1) a near-primitive olivine±clinopyroxene saturated melt, (2) a slightly fractionated olivine-( orthopyroxene )-clinopyroxene-plagioclase saturated melt, and (3) a strongly fractionated fayalitic olivine-plagioclase ± magnetite saturated melt. These magmas represent derivatives of a parental liquid that experienced various degrees of polybaric orthopyroxene-clinopyroxene ± olivine fractionation prior to emplacement, at depths significantly greater than the emplacement levels of the Giles intrusions and the dykes.
Google map showing geographic bounding box with values North bound -24.5 East bound 134.2 West bound 126.5 South bound -28.0
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1995

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