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Petrology and geochemistry of Proterozoic dolerites from the Mount Isa Inlier

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Created 20/01/2025

Updated 20/01/2025

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The Precambrian Mount Isa Inlier in northwest Queensland is extensively cut by numerous dolerite intrusions. At least two distinct episodes of dolerite intrusion have been recognised in each of the three major tectonic units: the western succession, basement sequence, and eastern succession. Olivine and quartz tholeiites predominate. The rocks in the western succession and basement sequence display little chemical variation with time. Those of the eastern succession display greater chemical variations. The most likely present-day tectonic analogue is that of an intracontinental rift. There is no evidence in the composition of the mafic igneous rocks to suggest that they were formed in a subduction-related environment such as an island arc or continental margin.

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Title Petrology and geochemistry of Proterozoic dolerites from the Mount Isa Inlier
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/a0a5fe9b-fc17-484e-83ec-800676647de6
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[138.54, -22.26], [141.36, -22.26], [141.36, -18.47], [138.54, -18.47], [138.54, -22.26]]]}
Data Portal data.gov.au