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The structure and metamorphism of the Red Point Metamorphic Complex - a newly discovered high-pressure metamorphic complex from the south coast of Tasmania

Citation

Mulder, JA and Berry, RF and Scott, RJ, The structure and metamorphism of the Red Point Metamorphic Complex - a newly discovered high-pressure metamorphic complex from the south coast of Tasmania, Australian Journal of Earth Sciences, 62, (8) pp. 969-983. ISSN 0812-0099 (2015) [Refereed Article]

Copyright Statement

Copyright 2016 Geological Society of Australia

DOI: doi:10.1080/08120099.2015.1117021

Abstract

This study presents new data on the deformational and metamorphic history of previously unstudied Cambrian high-pressure metamorphic rocks exposed on the remote south coast of Tasmania. The Red Point Metamorphic Complex consists of two blocks of high-pressure, medium-grade metamorphic rocks including pelitic schist and minor garnet-bearing amphibolite, which are faulted against a sequence of low-grade phyllite and quartzite. The Red Point Metamorphic Complex records five phases of deformation, all of which except the first are expressed at a mesoscopic scale in both the medium- and low-grade rocks. Peak metamorphic conditions in the high-pressure epidote–amphibolite facies is recorded by medium-grade schist and amphibolite and was synchronous with the second major deformation event, which produced a pervasive schistosity and mesoscale isoclinal folds. The juxtaposition of the low- and medium-grade rocks is interpreted to have first occurred prior to the development of upright, opening folding associated with the third deformation. However, the present contacts between the two contrasting metamorphic sequences formed during widespread faulting and ductile-shear zone development associated with the fourth and fifth deformation events. The new data from the Red Point Metamorphic Complex provide insights into the structural and metamorphic history experienced by the medium-grade rocks of Tasmania during the Cambrian Tyennan Orogeny. This study demonstrates that Cambrian medium-grade metamorphic rocks are more widespread throughout Tasmania than previously realised, which represents an important step towards understanding the large-scale architecture of the Tyennan Orogen.

Item Details

Item Type:Refereed Article
Keywords:Tyennan Orogeny, Tasmania, high P metamorphism, structure, Ross Orogeny, Delamerian Orogeny
Research Division:Earth Sciences
Research Group:Geology
Research Field:Structural Geology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Other Mineral Resources (excl. Energy Resources)
Objective Field:Mineral Resources (excl. Energy Resources) not elsewhere classified
Author:Mulder, JA (Mr Jacob Mulder)
Author:Berry, RF (Associate Professor Ron Berry)
Author:Scott, RJ (Dr Robert Scott)
ID Code:106656
Year Published:2015
Web of Science® Times Cited:1
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2016-02-17
Last Modified:2017-11-02
Downloads:0

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