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Abstract

The results of reconnaissance gravity and magnetic
traverses in the Red Hill area of Tasmania
confirm the structure postulated as most likely on
geological evidence. The granophyre which occurs
in the higher parts of the Red Hill Dyke has arisen
by differentiation of dolerite in situ, but the gravity
work shows that it is unlikely that the dyke continues
to a depth sufficient for all the granophyre
to have been produced solely by differentiation of
the vertical column of dolerite, so that some migration
of acid residuum from the underlying dolerite
sheet into the dyke has probably taken place.
The measurements illustrate how geophysical
methods can be helpful in structural problems
where dolerite has intruded less dense sediments,
but show that caution is necessary when interpreting
the results of magnetic surveys.

Item Type:	Article
Authors/Creators:	McDougal, I and Stott, PM
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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