PALEOMAGNETIC STUDY OF THE BEACON SUPERGROUP IN ANTARCTICA : REMAGNETIZATION IN THE JURASSIC TIME
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概要
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The Konigsberger-Thellier method was applied to the Beacon Supergroup of the Devonian period around the McMurdo Sound. Samples collected at the sites of Mt. Circe and Knobhead A have stable TRM. These sites are about 100m apart from the Jurassic Ferrar dolerite sill. Samples collected at the sites of Knobhead B and C about 150m apart from the dolerite sill, have the partial TRM. Microscopically the samples from Mt. Circe exhibit the dust-ring structure, and contain a minor amount of biotite as a secondary mineral. These results indicate that the Beacon Supergroup around the McMurdo Sound was thermally metamorphosed by the intrusion of the Jurassic Ferrar dolerite. This may explain why the Devonian VGP of Antarctica is far from the Devonian VGP of the Gondwanaland. The paleointensity estimated from the stable TRM in the Beacon sandstones was 50.5μT, which is slightly weaker than the present field intensity.
- 国立極地研究所の論文
著者
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SAKAI Hideo
Department of Oral Diagnosis and General Dentistry, Faculty of Dentistry, Tokyo Medical and Dental U
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Funaki Minoru
National Institute of Polar Research
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Sakai Hideo
Department Of Earth Sciences Faculty Of Science Toyama University
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Funaki Minoru
National Inst. Of Polar Res. 9-10 Kaga 1 Itabashi Tokyo 173-8515 Jpn
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