Early Precambrian basic rocks of Australia

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Authors:Purvis, A. C.
Author Affiliations:Primary:
Pontifex and Assoc., Rose Park, Australia
Volume Title:Early Precambrian basic magmatism
Volume Authors:Hall, R. P., editor; Hughes, D. J.
Source:Early Precambrian basic magmatism, edited by R. P. Hall and D. J. Hughes, p.317-338. Publisher: Chapman and Hall, New York, NY, United States
Publication Date:1990
Note:In English; illus. incl. 31 analys., 2 tables, geol. sketch maps
Summary:Australia has many geological similarities with other fragments of the former supercontinent Gondwanaland, and the Archaean of Australia is most similar to that of southern Africa. Parts of the Yilgarn block contain greenstone belts unconformably overlying other gneisses, and to this extent are similar to peninsular India. The recent discovery of Archaean high-grade sapphirine + quartz assemblages in South Australia points to similarities with the Napier complex in Antarctica. Most of the early Proterozoic rocks of Australia occur in folded, deformed 'mobile' belts, which appear to be a world-wide phenomenon. Although some Archaean rocks also occur in mobile belts, most of the Archaean mafic rocks of Australia occur within granite-greenstone terrains, known in Australia as 'blocks'. A considerable thickness of Archaean basalt also occurs in the gently folded Hamersley basin. Post-tectonic suites of dykes and sills occur commonly both in the mobile belts and in the Archaean blocks, and extensive sills occur in the epicratonic Kimberley basin. [J.M.H.]
Subjects:Basalts; Crystalline rocks; Dike swarms; Dikes; IGCP; Igneous rocks; Intrusions; Komatiite; Mafic composition; Petrology; Precambrian; Tholeiite; Ultramafic composition; Volcanic rocks; Australasia; Australia; Igneous activity
Abstract Numbers:91M/2103
Record ID:1991002617
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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