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Palaeomagnetic results from the Gordon Subgroup of Tasmania: Further evidence for a late Cretaceous magnetic overprint in Southeastern Australia

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Sharples, C and Klootwijk, CT (1981) Palaeomagnetic results from the Gordon Subgroup of Tasmania: Further evidence for a late Cretaceous magnetic overprint in Southeastern Australia. Papers and Proceedings of the Royal Society of Tasmania, 115. pp. 85-91. ISSN 0080-4703

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Abstract

A thermal demagnetization study of 48 limestone samples from the Ordovician Gordon Subgroup of Ida Bay (Tasmania), indicated complete remagnetization (D = 9 .4° I= - 81.4°, k = 137.5, a95 = l. 3o, N = 92 South pole position 59.8°5 1 41.1°E, dp = 2.4°, dm = 2.5°) during Late Cretaceous or less likely Early Tertiary time . This finding further supports a recently recognized Late Cretaceous remagnetization event in southeastern Australia , which is attributed to rift forming processes preceding the opening of t he Tasman Sea. Conodont colour indicates that the limestones studied have not been subjected to temperatures in excess of l00°c . This suggests a possible widespread occurrence of this magnetic overprint.

Item Type: Article
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
Page Range: pp. 85-91
ISSN: 0080-4703
Date Deposited: 20 Sep 2011 00:17
Last Modified: 03 Jun 2013 01:10
URI: http://eprints.utas.edu.au/id/eprint/11756
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