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Palaeomagnetic Results from the Gordon Subgroup of Tasmania: Further Evidence for a Late Cretaceous Magnetic Overprint in Southeastern Australia

Citation

Sharples, C and Klootwijk, CT, Palaeomagnetic Results from the Gordon Subgroup of Tasmania: Further Evidence for a Late Cretaceous Magnetic Overprint in Southeastern Australia, Royal Society of Tasmania, Hobart. Papers and Proceedings, 115 pp. 85-91. ISSN 0080-4703 (1981) [Refereed Article]


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Copyright Statement

Copyright 1981 Royal Society of Tasmania

Official URL: http://www.rst.org.au/publications.html

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 Au stral ia ,which is attributed to r ift forming processes preceding the opening of t he Tasman Sea. Conodont colour indicates that the limestones studied have not been subjected to temperatures in e xcess of l00°c . This suggests a possible widespread occurrence of this magnetic overprint.

Item Details

Item Type:Refereed Article
Research Division:Environmental Sciences
Research Group:Environmental Science and Management
Research Field:Environmental Management
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management at Regional or Larger Scales
UTAS Author:Sharples, C (Mr Chris Sharples)
ID Code:71416
Year Published:1981
Deposited By:Geography and Environmental Studies
Deposited On:2011-07-18
Last Modified:2012-06-28
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