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New paleomagnetic results from the Yangzhuang Formation of the Jixian System, North china, and tectonic imp{1.cations

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Science Bulletin 2005年第14期 77-83页

作者： wu huaichun1,{1., li zheng-xiang2. li haiyan1 & dong jin1 1. state key laboratory of geological processes and mineral resources & key laboratory of lithosphere tectonics and lithoprobing technology of ministry of education, china university of geosci- ences, beijing 100083, china 2. tectonics Special Research Centre, School of Earth and Geographical Sciences, The university of Western Australia, Crawley, WA 6009, Australia

A paleomagnetic study was carried out on the Yangzhuang Formation （1.50 Ma） of the Jixian System in the North china Block （NCB）. Detailed stepwise thermal demagnetization isolated two components. The soft compo- nent （component A） was interpreted as a remagnetization in the recent geomagnetic field. The hard component （compo- nent B） with higher unblocking-temperatures was carried by hematite. Its site-mean direction is D/I = 77.6°/-24.3° （κ = 5.4, α95 = 1..3°, N = 1. sites） before, and D/I = 72.2°/1..5° （κ = 24.6, α95 = 7.9°） after tilt correction. It passes a fold test （Mesozoic folding） at 99% confidence level and reversal test at 95% confidence level. The corresponding pole locates at 1..3°N, 21..5°E （dp = 4.1., dm = 8.0°）. A best fit of paleo- magnetic poles from the NCB, Baltica, Siberia and the ap- parent polar wander path for Laurentia suggests a long-{1.ved connection between these paleo-continents between1.00 and 1.50 Ma.

关键词： North china Block Yangzhuang Formation paleomag- netism Mesoproterozoic Rodinia Columbia.

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New paleomagnetic results from the Yangzhuang Formation of the Jixian System,North china,and tectonic imp{1.cations

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Chinese Science Bulletin 2005年第14期50卷 1483-1489页

作者： wu huaichun zhang shihong li zheng-xiang li haiyan dong jin state key laboratory of geological processes and mineral resources & key laboratory of lithosphere tectonics and lithoprobing technology of ministry of education China University of Geosciences Beijing 100083 China tectonics Special Research Centre School of Earth and Geographical Sciences The University of Western Australia Crawley WA 6009 Australia

A paleomagnetic study was carried out on the Yangzhuang Formation (~1.50 Ma) of the Jixian System in the North china Block (NCB). Detailed stepwise thermal demagnetization isolated two components. The soft compo- nent (component A) was interpreted as a remagnetization in the recent geomagnetic field. The hard component (compo- nent B) with higher unblocking-temperatures was carried by hematite. Its site-mean direction is D/I = 77.6°/-24.3° (κ = 5.4, α95 = 1..3°, N = 1. sites) before, and D/I = 72.2°/1..5° (κ = 24.6, α95 = 7.9°) after tilt correction. It passes a fold test (Mesozoic folding) at 99% confidence level and reversal test at 95% confidence level. The corresponding pole locates at 1..3°N, 21..5°E (dp = 4.1., dm = 8.0°). A best fit of paleo- magnetic poles from the NCB, Baltica, Siberia and the ap- parent polar wander path for Laurentia suggests a long-{1.ved connection between these paleo-continents between ~1.00 and 1.50 Ma.

关键词：古磁学中元古代中国岩石

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