Remanent magnetization of Precambrian and Cretaceous kimberlites in South Africa |
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| Authors: | H Ito K Tokieda K Suwa S Kume |
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| Institution: | Department of Physics, Shimane University, Matsue, 690 Japan;Department of Earth Sciences, Nagoya University, Nagoya, 464 Japan;College of General Education, Osaka University, Toyonaka, 560 Japan |
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| Abstract: | Summary. Middle Precambrian and Cretaceous kimberlites were collected from three sites (Premier, Montrose and National) and two sites (Wesselton and Koffyfontein) in South Africa respectively. The natural remanent magnetization of these rocks remains stable to both alternating field and thermal demagnetization. The virtual geomagnetic pole-positions derived from the directions of stable remanence of the Precambrian rocks can be correlated with palaeomagnetic poles obtained from other Middle-Late Precambrian rocks in Africa. The Cretaceous poles for the Wesselton and the Koffyfontein rocks coincide with other Cretaceous poles. |
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