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Kimberlite and kimberlitic intrusives of southeastern Australia

Published online by Cambridge University Press:  05 July 2018

John Ferguson
John Ferguson*
Affiliation:
Bureau of Mineral Resources, Geology and Geophysics, PO Box 378, Canberra, Australia 2601
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Summary

Fifteen widely separated occurrences of kimberlite and kimberlitic rocks are now known in south-eastern Australia. Those that have been satisfactorily dated isotopically give ages ranging from Permian to Late Jurassic. One occurrence exhibits an intimate spatial association with carbonatite. The classification of these rocks as ‘kimberlitic’ is partly based on their mode of emplacement, and particularly on the presence of crust/mantle inclusions. Compared with African kimberlitic magmas, the southeastern Australian examples have lower incompatible-element contents. These differences are interpreted as representing slightly greater degrees of partial melting of a four-phase Iherzolite assemblage at shallower depths (∼ 65 km) than typical African kimberlite magma.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 330 , June 1980 , pp. 727 - 731
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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