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https://hdl.handle.net/2440/52155
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Type: | Journal article |
Title: | High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia |
Author: | Dutch, R. Hand, M. Kinny, P. |
Citation: | Australian Journal of Earth Sciences, 2008; 55(8):1063-1081 |
Publisher: | Taylor & Francis |
Issue Date: | 2008 |
ISSN: | 0812-0099 1440-0952 |
Statement of Responsibility: | R. Dutch, M. Hand, P. D. Kinny |
Abstract: | SHRIMP U-Pb geochronology and monazite EPMA chemical dating from the southeast Gawler Craton has constrained the timing of high-grade reworking of the Early Paleoproterozoic (ca 2450 Ma) Sleaford Complex during the Paleoproterozoic Kimban Orogeny. SHRIMP monazite geochronology from mylonitic and migmatitic high-strain zones that deform the ca 2450 Ma peraluminous granites indicates that they formed at 1725 ± 2 and 1721 ± 3 Ma. These are within error of EPMA monazite chemical ages of the same high-strain zones which range between 1736 and 1691 Ma. SHRIMP dating of titanite from peak metamorphic (1000 MPa at 730°C) mafic assemblages gives ages of 1712 ± 8 and 1708 ± 12 Ma. The post-peak evolution is constrained by partial to complete replacement of garnet-clinopyroxene-bearing mafic assemblages by hornblende-plagioclase symplectites, which record conditions of ∼ 600 MPa at 700°C, implying a steeply decompressional exhumation path. The timing of Paleoproterozoic reworking corresponds to widespread deformation along the eastern margin of the Gawler Craton and the development of the Kalinjala Shear Zone. |
Keywords: | EPMA Gawler Craton Kimban Orogen monazite reworking SHRIMP |
Rights: | © 2008 Geological Society of Australia |
DOI: | 10.1080/08120090802266550 |
Grant ID: | http://purl.org/au-research/grants/arc/LP0454301 |
Published version: | http://dx.doi.org/10.1080/08120090802266550 |
Appears in Collections: | Aurora harvest Environment Institute publications Geology & Geophysics publications |
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