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The origin of mineralisation in South Heemskirk granite, Western Tasmania, Australia
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Abstract
The Heemskirk Granite intruded Precambrian and Cambrian rocks in
western Tasmania in the Devonian. It congists of red and white
granite types with the texture in both granite types ranging from
porphyritic to equigranular. The white granite underlies and intrudes
into the red types. The two types are similar mineralogically and
chemically and, apart from the colour difference, the white has more
miarolitic cavities, more alteration and a higher tourmaline content
than the red granite. The red granite consists of shallow-dipping
layers, each of which intruded and chilled against an upper preexisting
layer. The layering in the white granite is only localised
and the grainsize gradually increases away from the contact with the
red granite. The combined thickness of the red layers is about 300m
while the white granite is at least 500m thick.
It is postulated that the Heemskirk Granite grew by intrusion of
sheets into space formed by subsidence within a cauldron-type
structure.
The granite mainly consists of quartz, feldspar and biotite.
Hornblende is only present locally in porphyritic red granite. It is
pervasively altered with at least three generations of albite and
biotite and two generations of quartz and chlorite. Biotite
compositional differences between the two granite types may result
from reequilibration of biotite to lower temperatures in the white
granite.
| Item Type: | Thesis - PhD |
|---|---|
| Authors/Creators: | Hajitaheri, J |
| Keywords: | Geology, Granite |
| Copyright Holders: | The Author |
| Copyright Information: | Copyright 1985 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 (Ph.D.)--University of Tasmania, 1986. 1 folded map in pocket. Bibliography: leaves [248b]-272 |
| Item Statistics: | View statistics for this item |
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