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The Cambrian metamorphic history of Tasmania: The Metapelites

Citation

Chmielowski, RM and Berry, RF, The Cambrian metamorphic history of Tasmania: The Metapelites, Australian Journal of Earth Sciences, 59, (7) pp. 1007-1019. ISSN 0812-0099 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 Geological Society of Australia

DOI: doi:10.1080/08120099.2012.724449

Abstract

The 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.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Chmielowski, RM (Ms Reia Chmielowski)
Author:Berry, RF (Associate Professor Ron Berry)
ID Code:81375
Year Published:2012
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:5
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2012-12-04
Last Modified:2017-10-24
Downloads:3 View Download Statistics

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