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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 = 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.

Item Type:	Article
Authors/Creators:	Sharples, C and Klootwijk, CT
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
ISSN:	0080-4703
Collections:	Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:	Copyright Royal Society of Tasmania
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