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Abstract

During the period in between February 1978 until October 1979,
a geomagnetic variation study by means of eleven temporary field
stations has been conducted covering the area of Launceston quadrangle,
Tasmania Geological Atlas Series, sheet SK 55-4, scale 1 : 250 000.
The study area is situated between latitude 41 °00 and 41 °45 south and
between longitude 146 ° 15 and 148 °00 east, with a total area of about
12 700 sq. km.
The aim of this study is to record and analyse the behavior of
geomagnetic variations which are related to lateral changes of electrical
conductivity structure.
The coast effect similar to the one that was established in
Hobart ( Parkinson, 1962 ) is found in this area for longer periods
greater than 64 minutes. And an anomalous local high conductivity
zone is indicated by the directions of induction vectors at periods
less than or equal to 48 minutes. This anomalous conductive zone is
interpreted as caused by deep lateral variation of conductivity of
sedimentary rocks ( o- = 0.54 x 10-1 S.m-1 ) with ages between Cambrian
and younger and Devonian granodiorite (o- = 0.54, x 10-3 S.m-1), both
being covered by surface high conductive layer ( o- = 0.11 S.m-1) that
extends from east of Deloraine to west of Scottsdale.
The occurence of a mineralized zone between Nabowla, Scottsdale
and Tayene agrees with the direction of induction vectors at those stations.

Item Type:	Thesis - Coursework Master
Authors/Creators:	Buyung, Nazhar,1945-
Keywords:	Geomagnetism
Copyright Holders:	The Author
Copyright Information:	Copyright 1980 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Thesis (M.Sc.)--University of Tasmania, 1980
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