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AbstractThe important advance and very abundant results have been got in the geological study on the Pre-Cambrian in Yunnan. For exemples, the exact results and common viewpoints are obtained on the tectonics and basement rock group of the Three-River region; the boundary-conjunction zone between Gondwana and Eurasia supercontinents through West Yunnan; the shelf area and basement rock group of the west margin region of Yangzi and the top boundary of Sinian. And abundant data about Kunyang Group are collected....

AbstractThe important advance and very abundant results have been got in the geological study on the Pre-Cambrian in Yunnan. For exemples, the exact results and common viewpoints are obtained on the tectonics and basement rock group of the Three-River region; the boundary-conjunction zone between Gondwana and Eurasia supercontinents through West Yunnan; the shelf area and basement rock group of the west margin region of Yangzi and the top boundary of Sinian. And abundant data about Kunyang Group are collected. However, there are still some problems or shortages shich we must pay attention to. For exemples, the stratigraphic class ification and correlation of Three-River basement metamorphic rock group; could the boundary-conjunction zone between 2 supercontinents be regarded as “biboundary”? or does it belong to a “transition-transform zone”? does the Kangding Group as the first basement of Yangzi west margin extend to Ar3 ,even Ar2 in northwest sichuan?their exact classification-correlation and how to determine the related paleo-structure? and the determination of the normal, reversed succession, the top and bottom of Kunyang Group and the Dongchuan Movement?

云南前寒武纪地质研究,已取得重大进展和极为丰富的成果,如:三江区的大地构造和基底岩群,冈瓦纳与欧亚两超级(巨)大陆经过滇西的分界一拼合带;扬子西缘区的大陆架范围和基底岩群,以及震旦系的顶界都取得了确切成果和共识;对昆阳群积累了丰实材料等。然而,也要看到尚存在的欠缺,如:三江基底变质岩群的确切分层对比,两超级大陆分界拼合带能否最终确认为“双界线”?或属于一种“过渡转换(化)带”?作为扬子西缘的第一基底康定群是否延入到Ar3甚至川西北还包括Ar2?它们的确切分层对比与所关联的古构造如何厘定?昆阳群的正、倒层、其顶、底界和东川运动的确定等问题。

 
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