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The petrology of layered mafic-ultramafic intrusions of the Giles Complex, western Musgrave Block, Western Australia

Created 16/10/2025

Updated 16/10/2025

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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.

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Title The petrology of layered mafic-ultramafic intrusions of the Giles Complex, western Musgrave Block, Western Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/bcd11532-792f-4f1c-aa20-5f8319ccf7b5
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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      [
        126.5,
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      ],
      [
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      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "The petrology of layered mafic-ultramafic intrusions of the Giles Complex, western Musgrave Block, Western Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/the-petrology-of-layered-mafic-ultramafic-intrusions-of-the-giles-complex-western-musgrave-bloc