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Polyphase folding in Precambrian low-grade metamorphic rocks, Middle Gordon river, S.E. Tasmania

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Powell, C (1969) Polyphase folding in Precambrian low-grade metamorphic rocks, Middle Gordon river, S.E. Tasmania. Papers and Proceedings of the Royal Society of Tasmania, 103. pp. 47-54. ISSN 0080-4703

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Abstract

New exposures on the southern side of the proposed
damsite on the middle stretches of
the Gordon River reveal unequivocal examples of polyphase
folding in the Precambrian, low-grade
metamorphic rocks of southwestern Tasmania.
Three groups of folds are deformed by kink bands.
The first group comprises very tight, almost
isoclinal,and recumbent folds with north-south
trending hinges, and was formed by considerable
subhorizontal ovierriding of the western block
towards the east. These early, concentric folds are
folded by more open, similar folds. The hinges of
the second group of folds pitch shallowly north-northeastward
on steeply dipping axial surfaces
parallel to which there is a prominent transposition
foliation developed in the phyllites. These folds
were produced by a steeply inclined thrusting of
the eastern block towards the west during low
greenschist-facies conditions of metamorphism.
Small-scale, similar-style puckers pitching steeply
in the transposition foliation comprise the third
group of folds, and were produced by subsequent
subhorizontal movement in the phyllites of the
eastern block southwards.

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. 47-54
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

Copyright Royal Society of Tasmania

Date Deposited: 28 May 2012 04:48
Last Modified: 18 Nov 2014 04:37
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