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班公湖-怒江缝合带是横亘于青藏高原中部的一条重要构造线,其南北两侧分别为冈底斯地块和羌塘地块。缝合带以断续分布的蛇绿岩碎块为标志,具有典型增生造山带的特征。南羌塘主体为侏罗纪海相盆地,南缘部分地段发育增生混杂岩(耿全如等,2011);拉萨地块可能起源于澳大利亚大陆北缘,具有中部老,两侧新的特征(Zhu et al.,2011)。受中、新特提斯洋构造演化的影响,拉萨地块中北部构造主线为近东西
The Banghu-Nujiang suture zone is an important tectonic line that runs in the middle of the Qinghai-Tibet Plateau. Its north and south sides are the Gangdise massif and the Qiangtang massif respectively. Suture zone is intermittently distributed ophiolite fragments as a sign, with the characteristics of typical hyperplasia orogenic belt. The main body of the southern Qiangtang is the Jurassic marine basin and some areas of the southern margin are developed hyperplasic melanges (Geng et al., 2011). The Lhasa block may originate from the northern margin of the Australian mainland and has the characteristics of old and new sides in the middle (Zhu et al. , 2011). Affected by the tectonic evolution of the Middle and Neo-Tethys, the main tectonic line in the north of Lhasa is near east-west