High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia
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 mig...
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| Format: | Journal Article |
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Taylor & Francis Ltd
2008
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| Online Access: | http://hdl.handle.net/20.500.11937/34784 |
| _version_ | 1848754317388939264 |
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| author | Dutch, R. Hand, M. Kinny, Peter |
| author_facet | Dutch, R. Hand, M. Kinny, Peter |
| author_sort | Dutch, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T08:38:29Z |
| format | Journal Article |
| id | curtin-20.500.11937-34784 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:38:29Z |
| publishDate | 2008 |
| publisher | Taylor & Francis Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-347842019-02-19T04:28:17Z High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia Dutch, R. Hand, M. Kinny, Peter SHRIMP EPMA reworking Kimban Orogen Gawler Craton monazite 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. 2008 Journal Article http://hdl.handle.net/20.500.11937/34784 10.1080/08120090802266550 Taylor & Francis Ltd fulltext |
| spellingShingle | SHRIMP EPMA reworking Kimban Orogen Gawler Craton monazite Dutch, R. Hand, M. Kinny, Peter High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia |
| title | High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia |
| title_full | High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia |
| title_fullStr | High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia |
| title_full_unstemmed | High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia |
| title_short | High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia |
| title_sort | high-grade paleoproterozoic reworking in the southeastern gawler craton, south australia |
| topic | SHRIMP EPMA reworking Kimban Orogen Gawler Craton monazite |
| url | http://hdl.handle.net/20.500.11937/34784 |