Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/13626
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Type: Journal article
Title: Origin and age of bornhardts, southwest Western Australia
Author: Twidale, C.
Bourne, J.
Citation: Australian Journal of Earth Sciences, 1998; 45(6):903-914
Publisher: BLACKWELL SCIENCE ASIA
Issue Date: 1998
ISSN: 0812-0099
1440-0952
Abstract: Most of the granitic residuals of the Wheat Belt of southwestern Western Australia are bornhardts, with some nubbins developed at the western margin and occasional poorly developed castellated forms. Their origin and age can be deduced from their structure and their relationship to a weathered (lateritic) land surface and various palaeochannels. The bornhardts are massive and most stand lower than local palaeosurface remnants. They are best interpreted as having formed by differential fracture density controlled weathering beneath the weathered land surface in pre-Eocene times. They were exposed by the stripping of the regolith beginning in the Eocene. Many are clearly stepped, indicating that their exposure took place not all at once, but episodically. A few bornhardts stand higher than the weathered land surface. They pre-date the Eocene and the stepped morphology preserved on some suggests that their crests are much older. © 1998 Taylor & Francis Group, LLC.
DOI: 10.1080/08120099808728444
Published version: http://dx.doi.org/10.1080/08120099808728444
Appears in Collections:Aurora harvest 2
Geology & Geophysics publications

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