羌塘地块北界拉竹龙—西金乌兰—玉树结合带印支期构造环境探讨

认为羌塘北部边界断裂结合带在印支期期间具有明显的构造分段性，其东段在玉树地区发育有较完整的蛇绿岩组合，且发育有限洋盆；此有限洋向西延伸呈收敛的趋势，由有限洋逐渐转变为陆间裂谷至大陆边缘裂谷，蛇绿岩组合逐渐消失，火成岩渐变为裂谷型双峰式火山岩组合。

Discussion on the Tectonic Setting during Indo China Epoch of the Lazhulong Xijinwulan Yushu Suture Zone, on North Margin of Qiangtang

The north suture zone of Qiangtang landmass exhibits obviously tectonic seguament during Indo China epoch. Its eastern part developed ophiolite system in Yushu area, which indicates a ancient limited ocean basin. As the limited ocean basin extended to the west direction, it first transformed as a intracontinental rift, then it became a continental marginal rift valley. At the same time, the ophiolite association disappeared progressively from the east to the west. And at the western part, the petrotectonic assemblage had changed into the bimodal volcanic rock association.