Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn
Original connections among the world's extant Archean cratons are becoming tractable by the use of integrated paleomagnetic and geochronologic studies on Paleoproterozoic mafic dyke swarms. Here we report new high-quality paleomagnetic data from the ~2.41 Ga Widgiemooltha dyke swarm of the Yilg...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Elsevier BV
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/28371 |
| _version_ | 1848752518451953664 |
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| author | Smirnov, A. Evans, D. Ernest, R. Söderlund, U. Li, Zheng-Xiang |
| author_facet | Smirnov, A. Evans, D. Ernest, R. Söderlund, U. Li, Zheng-Xiang |
| author_sort | Smirnov, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Original connections among the world's extant Archean cratons are becoming tractable by the use of integrated paleomagnetic and geochronologic studies on Paleoproterozoic mafic dyke swarms. Here we report new high-quality paleomagnetic data from the ~2.41 Ga Widgiemooltha dyke swarm of the Yilgarn craton in western Australia, confirming earlier results from that unit, in which the primary origin of characteristic remanent magnetization is now confirmed by baked-contact tests. The corresponding paleomagnetic pole (10.2°S, 159.2°E, A95 = 7.5°), in combination with newly available ages on dykes from Zimbabwe, allow for a direct connection between the Zimbabwe and Yilgarn cratons at 2.41 Ga, with implied connections as early as their cratonization intervals at 2.7–2.6 Ga. The proposed “Zimgarn” supercraton was likely distinct from Vaalbara (Kaapvaal plus Pilbara) at 2.4 Ga, but both of those entities independently fragmented at ca. 2.1–2.0 Ga, reassembling into the Kalahari and West Australian cratons by 1.95–1.8 Ga. |
| first_indexed | 2025-11-14T08:09:54Z |
| format | Journal Article |
| id | curtin-20.500.11937-28371 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:09:54Z |
| publishDate | 2013 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-283712017-09-13T15:20:55Z Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn Smirnov, A. Evans, D. Ernest, R. Söderlund, U. Li, Zheng-Xiang Pilbara Paleoproterozoic Paleomagnetism Zimbabve craton Kaapvaal craton Yilgarn Original connections among the world's extant Archean cratons are becoming tractable by the use of integrated paleomagnetic and geochronologic studies on Paleoproterozoic mafic dyke swarms. Here we report new high-quality paleomagnetic data from the ~2.41 Ga Widgiemooltha dyke swarm of the Yilgarn craton in western Australia, confirming earlier results from that unit, in which the primary origin of characteristic remanent magnetization is now confirmed by baked-contact tests. The corresponding paleomagnetic pole (10.2°S, 159.2°E, A95 = 7.5°), in combination with newly available ages on dykes from Zimbabwe, allow for a direct connection between the Zimbabwe and Yilgarn cratons at 2.41 Ga, with implied connections as early as their cratonization intervals at 2.7–2.6 Ga. The proposed “Zimgarn” supercraton was likely distinct from Vaalbara (Kaapvaal plus Pilbara) at 2.4 Ga, but both of those entities independently fragmented at ca. 2.1–2.0 Ga, reassembling into the Kalahari and West Australian cratons by 1.95–1.8 Ga. 2013 Journal Article http://hdl.handle.net/20.500.11937/28371 10.1016/j.precamres.2012.09.020 Elsevier BV restricted |
| spellingShingle | Pilbara Paleoproterozoic Paleomagnetism Zimbabve craton Kaapvaal craton Yilgarn Smirnov, A. Evans, D. Ernest, R. Söderlund, U. Li, Zheng-Xiang Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn |
| title | Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn |
| title_full | Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn |
| title_fullStr | Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn |
| title_full_unstemmed | Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn |
| title_short | Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn |
| title_sort | trading partners: tectonic ancestry of southern africa and western australia, in archean supercratons vaalbara and zimgarn |
| topic | Pilbara Paleoproterozoic Paleomagnetism Zimbabve craton Kaapvaal craton Yilgarn |
| url | http://hdl.handle.net/20.500.11937/28371 |