New paleomagnetic results from the Yangzhuang Formation of the Jixian System,North China,and tectonic implications |
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Authors: | Huaichun?Wu Email author" target="_blank">Shihong?ZhangEmail author Zheng-Xiang?Li Haiyan?Li Jin?Dong |
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Institution: | (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 Geosciences, 100083 Beijing, China;(2) Tectonics Special Research Centre, School of Earth and Geographical Sciences, The University of Western Australia, 6009 Crawley, WA, Australia |
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Abstract: | A paleomagnetic study was carried out on the Yangzhuang Formation (~1350 Ma) of the Jixian System in the North China Block
(NCB). Detailed stepwise thermal demagnetization isolated two components. The soft component (component A) was interpreted
as a remagnetization in the recent geomagnetic field. The hard component (component B) with higher unblocking-temperatures
was carried by hematite. Its site-mean direction is D/I = 77.6°/-24.3° (к = 5.4, α95 = 18.3°, N = 15 sites) before, and D/I = 72.2°/11.5° (к = 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 17.3°N, 214.5°E (dp = 4.1°, dm = 8.0°). A best fit of paleomagnetic poles from the NCB, Baltica, Siberia and the apparent polar wander path for Laurentia
suggests a long-lived connection between these paleo-continents between ~1800 and 1350 Ma. |
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Keywords: | North China Block Yangzhuang Formation paleomagnetism Mesoproterozoic Rodinia Columbia |
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