Paleomagnetism and U–Pb age of the 2.4 Ga Erayinia mafic dykes in the south-western Yilgarn, Western Australia: Paleogeographic and geodynamic implications
We present results from a paleomagnetic study of the previously undated Erayinia dykes intruding the south-western Yilgarn Craton. The U–Pb TIMs baddeleyite age of these dykes is now 2401 ± 1 Ma, which is about 10 m.y. younger than the 2418–2410 Ma Widgiemooltha dyke swarm. The paleomagnetic study i...
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| Format: | Journal Article |
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Elsevier BV
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/23282 |
| _version_ | 1848751106957508608 |
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| author | Pisarevskiy, Sergei Waele, B. Jones, Sarah Soderlund, U. Ernst, R. |
| author_facet | Pisarevskiy, Sergei Waele, B. Jones, Sarah Soderlund, U. Ernst, R. |
| author_sort | Pisarevskiy, Sergei |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present results from a paleomagnetic study of the previously undated Erayinia dykes intruding the south-western Yilgarn Craton. The U–Pb TIMs baddeleyite age of these dykes is now 2401 ± 1 Ma, which is about 10 m.y. younger than the 2418–2410 Ma Widgiemooltha dyke swarm. The paleomagnetic study isolated a stable primary remanence with steep downward direction, and the paleomagnetic pole (22.7° S, 150.5° E, A95 = 11.4°) is similar, but not identical to that of the previously studied Widgiemooltha dykes. We interpret this difference as the result of the movement of the Yilgarn Craton toward the pole at ∼1°/m.y. angular speed, which is comparable with tectonic plates’ velocities during the Phanerozoic. Paleomagnetic polarities of Widgiemooltha and Erayinia dykes suggest that at least one geomagnetic reversal occurred between these two magmatic events. The estimated amplitude of geomagnetic secular variations at c. 2400 Ma is slightly higher than predicted by the existing models for the last 5 m.y. at the c. 64° latitude. The paleomagnetic data and patterns of c. 2.6–2.1 Ga mafic dyke swarms permit the recently suggested reconstruction of the Paleoproterozoic supercontinent. |
| first_indexed | 2025-11-14T07:47:28Z |
| format | Journal Article |
| id | curtin-20.500.11937-23282 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:47:28Z |
| publishDate | 2015 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-232822017-09-13T13:59:02Z Paleomagnetism and U–Pb age of the 2.4 Ga Erayinia mafic dykes in the south-western Yilgarn, Western Australia: Paleogeographic and geodynamic implications Pisarevskiy, Sergei Waele, B. Jones, Sarah Soderlund, U. Ernst, R. Supercontinent U–Pb TIMs age Paleoproterozoic Paleomagnetism Mafic dykes Yilgarn Craton We present results from a paleomagnetic study of the previously undated Erayinia dykes intruding the south-western Yilgarn Craton. The U–Pb TIMs baddeleyite age of these dykes is now 2401 ± 1 Ma, which is about 10 m.y. younger than the 2418–2410 Ma Widgiemooltha dyke swarm. The paleomagnetic study isolated a stable primary remanence with steep downward direction, and the paleomagnetic pole (22.7° S, 150.5° E, A95 = 11.4°) is similar, but not identical to that of the previously studied Widgiemooltha dykes. We interpret this difference as the result of the movement of the Yilgarn Craton toward the pole at ∼1°/m.y. angular speed, which is comparable with tectonic plates’ velocities during the Phanerozoic. Paleomagnetic polarities of Widgiemooltha and Erayinia dykes suggest that at least one geomagnetic reversal occurred between these two magmatic events. The estimated amplitude of geomagnetic secular variations at c. 2400 Ma is slightly higher than predicted by the existing models for the last 5 m.y. at the c. 64° latitude. The paleomagnetic data and patterns of c. 2.6–2.1 Ga mafic dyke swarms permit the recently suggested reconstruction of the Paleoproterozoic supercontinent. 2015 Journal Article http://hdl.handle.net/20.500.11937/23282 10.1016/j.precamres.2014.05.023 Elsevier BV fulltext |
| spellingShingle | Supercontinent U–Pb TIMs age Paleoproterozoic Paleomagnetism Mafic dykes Yilgarn Craton Pisarevskiy, Sergei Waele, B. Jones, Sarah Soderlund, U. Ernst, R. Paleomagnetism and U–Pb age of the 2.4 Ga Erayinia mafic dykes in the south-western Yilgarn, Western Australia: Paleogeographic and geodynamic implications |
| title | Paleomagnetism and U–Pb age of the 2.4 Ga Erayinia mafic dykes in the south-western Yilgarn, Western Australia: Paleogeographic and geodynamic implications |
| title_full | Paleomagnetism and U–Pb age of the 2.4 Ga Erayinia mafic dykes in the south-western Yilgarn, Western Australia: Paleogeographic and geodynamic implications |
| title_fullStr | Paleomagnetism and U–Pb age of the 2.4 Ga Erayinia mafic dykes in the south-western Yilgarn, Western Australia: Paleogeographic and geodynamic implications |
| title_full_unstemmed | Paleomagnetism and U–Pb age of the 2.4 Ga Erayinia mafic dykes in the south-western Yilgarn, Western Australia: Paleogeographic and geodynamic implications |
| title_short | Paleomagnetism and U–Pb age of the 2.4 Ga Erayinia mafic dykes in the south-western Yilgarn, Western Australia: Paleogeographic and geodynamic implications |
| title_sort | paleomagnetism and u–pb age of the 2.4 ga erayinia mafic dykes in the south-western yilgarn, western australia: paleogeographic and geodynamic implications |
| topic | Supercontinent U–Pb TIMs age Paleoproterozoic Paleomagnetism Mafic dykes Yilgarn Craton |
| url | http://hdl.handle.net/20.500.11937/23282 |