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Abstract

A variety of igneous, sedimentary and metamorphic
Palaeozoic rocks from Tasmania have
similar directions of NRM-steeply upward.
Although the mean direction is not significantly
difIerent at the 95% confidence level from the
present field, its inclination is slightly steeper.
Moreover, the palaeomagnetic pole calculated from
these directions is closer to Tertiary poles from
Australia than to the present pole. On this data
it is statistically more probable that the NRMs are
of Tertiary rather than recent age. Their characteristics
are the same as viscous PTRMs, and
they are likely to have been acquired during a
period of slightly elevated rock temperatures. This
warming-up may have been associated with Tertiary
basaltic activity in Tasmania, or with slightly
later regional heating over wide areas of eastern
Australia, which has previously been suggested
on petrological grounds.

Item Type:	Article
Authors/Creators:	Briden, JC
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
Item Statistics:	View statistics for this item

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