Granite, gabbro, and migmatite field relationships in the Proterozoic Lamboo Complex of the East Kimberley region, Western Australia

Intrusive contacts between granite plutons and adjacent gabbro in the Proterozoic Lamboo Complex are characterised by net-veined complexes in which pillow-like mafic bodies are enclosed in and veined by granitic rock. Pillow features, such as marginal chilling and cuspate contacts with granitic rock, are diagnostic of magma mingling, and show that either the mafic and felsic components of the net-veined complexes were intruded as magmas together or, as is considered more likely, mafic magma was intruded into already emplaced granite which became partly melted and remobilised; i.e. granite plutons are older than adjacent gabbro intrusions, not younger as previously proposed. Differences in age between granite and adjacent gabbro are probably not large, as the granite is presumed to have been hot, and perhaps not completely crystallised, at the time of gabbro intrusion, to account for the large volumes of remobilised granitic melt represented in the net-veined complexes. Migmatite spatially associated with the net-veined complexes may be attributed to partial melting during gabbro intrusion, rather than to an earlier regional metamorphism.

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Date (Publication)
1993-01-01T00:00:00
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81368

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Australian Geological Survey Organisation

 Canberra
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Blake, D.H.

 1
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Hoatson, D.M.

 2
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AGSO Journal of Australian Geology and Geophysics

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14:4:319-330

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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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  • Earth Sciences

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2018-11-01T00:00:00
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English
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Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified

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urn:uuid/fae9173a-7135-71e4-e044-00144fdd4fa6

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English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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AGSO BMR Journal

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eCatId/81368

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-7135-71e4-e044-00144fdd4fa6

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2018-04-20T06:07:45
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2014-06-03T00:00:00

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ISO 19115-1:2014

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ISO 19115-3

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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

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Version 2.0, September 2018

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https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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