| 论保山地区晚古生代大地构造位置 |
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| 关键词:Palaeo-Tethys Baoshan massif western Yunnan tectonics Late, |
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| On the Tectonic Position of the Baoshan Region during Late Palaeozoic Period |
| The aim of this study is to discuss the tectonic position of Baoshan in Yunnan Province, China during the Late Paleozoic by comparison of the sedimentary facies and fauna as well aspalaeomagnetic data from the Baoshan region with those from the Yangtze region and southernTibet.The sedimentary facies change suggests that in the Late Palaeozoic the Baoshan regionunderwent a similar geological history aS did southern Tibet,which is different from that ofthe Yangtze region. The rugose corals and brachiopods as well as vertebrates of Baoshan aredifferent from those of the Yangtze region during the Late Paleozoic. An evident organicsegregation seems to exist between them.The Late Paleozoic fauna of Baoshan showssimilarity to southern Tibet to a certain extent.Especially,Devonian and Late Carboniferousfaunas are very close to southern Tibet.This indicates that there was no evident organicsegregation between them in Late Palaeozoic. The palaeomagnetic data reveal that in LatePalaeozoic the Yangtze region was close to the equator,while the Baoshan region and southernTibet were situated in the middle latitudes. On the basis of the palaeontological,sedimentological and palaeomagnetic data,it isinferred that Baoshan and southern Tibet were situated in one and the same continentalmargin,and the both regions were far from the Yangtze region during the Late Paleozoic. TheBaoshan region may be considered as a massif within the Gondwana tectonic domain,includingsouthern Tibet,while the Yangtze region was loceted in another tectonic domain─the SouthAsian domain,with a wide ocean,the Tethvs between them. |
| WANG Xun-lian,KATO Makoto,WANG Hong-zhen.1994.On the Tectonic Position of the Baoshan Region during Late Palaeozoic Period[J].Acta Geoscientica Sinica,15(3,4):130-144. |
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