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Contact structures at a granodiorite intrusion, Piccaninny Point, north-east Tasmania

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Gee, RD and Groves, DI (1973) Contact structures at a granodiorite intrusion, Piccaninny Point, north-east Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 107. pp. 47-52. ISSN 0080-4703

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Abstract

At Piccaninny Point, structures developed at the contact between the Piccaninny
Creek Pluton and the Mathinna Beds have, a bearing on the mode of emplacement of this
body and other granodiorite plutons in north-eastern Tasmania. The contact has both
concordant and irregularly discordant segments, and a dilational mode of intrusion
is indicated. During the late crystallisation stage flattening of partially crystallised
magma against the contact produced a secondary cataclastic foliation and flattened
xenoliths, and caused injection of cross-cutting leucocratic dykes. Magmatic
pressure on the wall continued after the marginal granodiorite had crystallised,
producing conjugate faults and quartz gash-veining. The Piccaninny Point contact
has features analogous to regional features of the granodiorite plutons of the Blue
Tier Batholith to the north. The granodioritic plutons appear to have been emplaced
by fracture controlled dilation, with upwelling of magma in the centre and lateral
spreading against the walls.

Item Type: Article
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
Page Range: pp. 47-52
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

Copyright Royal Society of Tasmania

Date Deposited: 18 May 2012 06:37
Last Modified: 18 Nov 2014 04:32
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