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The Cambrian metamorphic history of Tasmania: The Metapelites
journal contribution
posted on 2023-05-17, 14:52 authored by Chmielowski, RM, Ronald BerryRonald BerryThe metamorphic complexes of Tasmania formed during the Cambrian (ca 510 Ma) as a result of rapid compression in a subduction zone setting followed by rapid exhumation, which brought various fault-bounded metamorphic complexes back to the surface in less than 5 Ma. The two highest grade complexes, the Franklin Metamorphic Complex, and the Port Davey Metamorphic Complex, experienced initial growth of metamorphic garnets at ~560°C, ~0.56 GPa. However, their subsequent metamorphic histories diverge, with the FMC displaying a marked increase in pressure (to 1.4 GPa at peak P/T), while the PDMC shows only a slight increase in pressure (to ~0.7 GPa). Both complexes show only a minor increase in temperature (~100°C) between initial garnet growth and peak metamorphic conditions. Rapid exhumation of these complexes can be accounted for by a slab-breakoff model. However, the difference in peak pressure between these complexes requires either continued subduction of the FMC while the PDMC had already begun its return towards the surface or that the subduction zone geometry resulted in significantly different pressures occurring contemporaneously within portions of the channel, which are not far removed from one another. © 2012 Copyright Taylor and Francis Group, LLC.
Funding
Australian Research Council
AMIRA International Ltd
ARC C of E Industry Partner $ to be allocated
Anglo American Exploration Philippines Inc
AngloGold Ashanti Australia Limited
Australian National University
BHP Billiton Ltd
Barrick (Australia Pacific) PTY Limited
CSIRO Earth Science & Resource Engineering
Mineral Resources Tasmania
Minerals Council of Australia
Newcrest Mining Limited
Newmont Australia Ltd
Oz Minerals Australia Limited
Rio Tinto Exploration
St Barbara Limited
Teck Cominco Limited
University of Melbourne
University of Queensland
Zinifex Australia Ltd
History
Publication title
Australian Journal of Earth SciencesVolume
59Issue
7Pagination
1007-1019ISSN
0812-0099Department/School
School of Natural SciencesPublisher
Taylor & Francis Ltd.Place of publication
4 Park Sq Milton Pk, Abingdon, Oxfordshire OX14 UKRights statement
Copyright 2012 Geological Society of AustraliaRepository Status
- Restricted