Tectonic implications of post-folding Permian magnetizations in the Carapacha Basin, La Pampa province, Argentina
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- Tomezzoli Renata N.
- CONICET-Consejo Nacional de Investigaciones Científicas y Técnicas Universidad de Buenos Aires, F.C.E. y N., Departamento de Ciencias Geológicas, Pab. II., Ciudad Universitaria
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- Melchor Ricardo N.
- CONICET-Consejo Nacional de Investigaciones Científicas y Técnicas Universidad Nacional de La Pampa
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- MacDonald William D.
- State University of New York
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説明
Paleomagnetic results from Permian clastic and igneous rocks of the Carapacha Basin of the Gondwáides orogenic zone of central Argentina are mainly consistent with results reported previously from the same zone further east, e.g., in the Sierra de la Ventana. Three lithologic entities were analysed: the lower member and upper member of the Carapacha Formation, and an andesite intrusive into the upper member. The directions of their characteristic remanences are similar, differ significantly from the present field direction, and are post-folding. The in situ magnetization directions are moreover consistent with directions expected for late Permian poles of the APWP for South America. The in situ pole for the lower Carapacha Formation is 70°S, 049°E, A95=11° (San Roberto pole); the pole for the upper Carapacha, combined with similar directions from the intrusive, is 64°S, 005°E, A95=5° (Río Curacó pole). These magnetizations imply that the Carapacha Formation, with a minimum age of early Late Permian (about 260 Ma.), was deformed before the end of the Permian. Structural evidence, as well as paleomagnetic, IRM, and AMS experimental results, support the interpretations. The paleogeographic implications of these results are interpreted as a significant counterclockwise movement of Gondwana between the early and the late Permian.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 58 (10), 1235-1246, 2006
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681489113984
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- NII論文ID
- 10024494302
- 130003956561
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 8543582
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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