| 华南早三叠世的古地磁学与大地构造 |
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| 引用本文： | 陈海泓,孙枢,李继亮,许靖华.华南早三叠世的古地磁学与大地构造[J].地质科学,1994,29(1):1-9. |
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| 作者姓名： | 陈海泓 孙枢 李继亮 许靖华 |
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| 作者单位： | 1. 中国科学院地质研究所 北京 100029;2. 瑞士苏黎世理工大学 CH-8092 苏黎世 |
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| 基金项目： | 国家自然科学基金,瑞士苏黎世理工大学联合资助 |
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| 摘 要： | 从华南几个具代表性地点的下三叠统灰岩中,获得了有意义的古地磁学初步结果。这些结果支持华南存在分离板块的设想。根据新近获得的地质与古地磁学证据,推断华南存在4个岩石图板块。它们是扬子(D=232.4°,I=-11.8°,K=28.2,α95=5.5°),湘桂(D=198.0°,I=32.2°,α95=12.9°),华夏(D=88.0°,I=13.0°,K=20.1,α95=9.1°)和海南(上二叠统D=338.2°,I=15.9°,K=10.2,α95=14.3°)板块。4个板块的古地磁极位分散,纬度差明显,并存在碰撞后的局部与区域性的旋转作用,尤其是顺时针旋转。华南早中生代的大地构造可理解为4个来自古特提斯和冈瓦纳的岩石圈碎块与欧亚大陆聚合作用的产物。
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| 关 键 词： | 早三叠世 古地磁学 岩石磁学 古地理恢复 华南四板块 |
| 收稿时间： | 1992-01-01 |
| 修稿时间： | 1992-01-01; |
PALEOMAGNETIC CONSTRAINTS ON EARLY TRIASSIC TECTONICS OF SOUTH CHINA |
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| Chen Haihong, Sun Shu, Li Jiliang.PALEOMAGNETIC CONSTRAINTS ON EARLY TRIASSIC TECTONICS OF SOUTH CHINA[J].Chinese Journal of Geology,1994,29(1):1-9. |
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| Authors: | Chen Haihong Sun Shu Li Jiliang |
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| Institution: | 1. Institute of Geology, Academia Sinica, Beijing 100029, China;2. Swiss Federal institute of Technology, CH-8092 Zurick, Switzerland |
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| Abstract: | New preliminary paleomagnetic results from the Lower Triassic limestones in several representative localities of South China support the suggestion of the existence of displaced blocks proposed by Hsu et al.(1987;1990).Four continental fragments have been recognized based on the geological and paleom3gnetic evidences.They are the Yangtze (D = 232.4°,I =- 11.8°,K= 28.2,α95=5.5°),Xianggui (D=198.0°,I =-32.2°,α95= 12.9°), Cathaysia (D= 88.0°,I=- 13.0°, K= 20.1,α95=9.1°) and Hainan(late Permian data D=338.2°,I= - 15.9°,K=10.2,α95=14.3°) blocks.The paleopole positions of the four blocks are scarttered and latitudinal discrepancies are apparent. This may be due to the separations and displacements of the blocks instead of crustal shortening.Differential post-collision rotations, especially clockwise rotations can be seen in the blocks,which may be the product of regional and local rotations.The early Mesozoic tectonics of South China can be interpreted in terms of amalgamation of the four continental blocks from the Paleotethys and Gandwanaland towards the Eurasia continent. |
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| Keywords: | Early Triassic Paleomagnetism Rock magnetism Four blocks Paleogeography reconstruction South China |
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