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Palaeomagnetic results from the Gordon Subgroup of Tasmania: further evidence for a Late Cretaceous magnetic overprint in southeastern Australia
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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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 = 1.30, N 92 South pole position 59.80 S 141.10E, dp = 2.4°, dm = 2.5°) during Late Cretaceous or less likely Early Tertiary time. This finding further supports a recently recognized Late Cretaceous renagnetization event in southeastern Australia, which is attributed to rift forming processes preceding the opening of the Tasman Sea. Conodont colour indicates that the limestones studied have not been subjected to temperatures in excess of 100°C. This suggests a possible widespread occurrence of this magnetic overprint.
|Keywords:||Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library|
|Journal or Publication Title:||Papers and Proceedings of the Royal Society of Tasmania|
|Page Range:||pp. 85-91|
|Collections:||Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania|
|Additional Information:||Copyright Royal Society of Tasmania|
|Date Deposited:||28 May 2012 01:09|
|Last Modified:||18 Nov 2014 04:36|
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