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地质科学  1987, Vol. Issue (4): 306-315    DOI:
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华南地块的地极移动曲线及其地质意义
林金录
中国科学院地质研究所
THE APPARENT POLAR WANDER PATH FOR THE SOUTH CHINA BLOCK AND ITS GEOLOGICAL SIGNIFICANCE
Lin Jinlu
Institute of Geology, Academia Sinica, Beijing
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摘要 结合最近获得的古地磁数据,作者重新计算编制了华南地块的地极移动曲线,进而讨论了华南和华北地块在早古生代的地理位置,二者最后拼合的时代,以及华南地块和欧亚大陆北部两条极移曲线之间的系统偏差等问题。
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林金录
关键词古地磁   地极移动曲线   华南地块   冈瓦纳   欧亚大陆     
Abstract: Several new paleomagnetic results, which include the paleopoles of late Cretaceous-Pale-ocene, Early-Middle Cretaceous, Late Triassic, Early Triassic, Permian and Middle Silurian, have recently become available from the South China Block(SCB). These new results, which are generally in agreement with the previous version of the Apparent Polar Wander(APW)path for the SCB, provide an opportunity for a refinement of the APW path for the SCB. The refined APW path has important implications for the tectonic evolution of the Chinese blocks.(1)As the Early Triassic paleomagnetic poles from the North China block and the SCB are quite different, while the Middle Jurassic poles from the two blocks are statistically indistinguishable, therefore, the final collision of the two blocks must have taken place sometime during the Middle Triassic-Early Jurassic, which is also the time interval of the so-called In-dosinian orogeny.(2)The early Paleozoic Gondwanan APW path consists of a loop which makes its Middle Silurian pole superposed on its Early Cambrian pole. The recently available Middle Silurian pole of the SCB is also coincident with its Early Cambrian pole. Therefore, it would be very interesting to see whether the early Paleozoic APW segment for the SCB also consists of a loop similar to that which the Gondwanan APW has during this period. If this is confirmed, it will be an important piece of evidence for the suggestion that the SCB was a coherent part of Gondwana in the early Paleozoic. Paleomagnetic results of the Middle Cambrian-Late Ordovician from the SCB are therefore desperately needed.(3)The previous version of the APW path for the SCB is seen shifted 40?-50? eastward with respect to the northern Eurasian APW path. This peculiar feature still remains on the new version. The previous suggestion that the APW path for the SCB is significantly different from the northern Eurasian APW path is therefore also confirmed. If there is no severe error on the two paths, the difference between them must suggest that the SCB has moved several thousand kilometers eastward with respect to northern Eurasia, as previously suggested. Timing the motion is, however, still difficult at the moment, although the major part of the motion seems to have taken place by the Middle Jurassic.
Key wordspaleomagnetism   APW path   South China block   Gondwana   Eurasia   
收稿日期: 1985-10-01;
基金资助:中国科学院青年基金
引用本文:   
林金录. 1987, 华南地块的地极移动曲线及其地质意义. 地质科学, (4): 306-315.
Lin Jinlu. THE APPARENT POLAR WANDER PATH FOR THE SOUTH CHINA BLOCK AND ITS GEOLOGICAL SIGNIFICANCE[J]. Chinese Journal of Geology, 1987, (4): 306-315.
 
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