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聂拉木群为一套中深成变质的前寒武系复理石沉积岩系。据变质作用的重迭改造及区域构造的发展,可分为基底变质和喜马拉雅变质两个主要变质期。以聂拉木—樟木剖面为例,前者由北而南由黑云母带至蓝晶石带,形成完整的前进变质系列,这一变质带沿喜马拉雅褶皱系东西绵延,长达千余千米。在我国境内的分布宽自30至60km 不等,但岩性稳定,均可追索对比,显示之基底变质作用的广泛和稳定性,在我国境内以蓝晶石至黑云
Nyalam Group is a set of deep metamorphic Precambrian flysch sedimentary rocks. According to the metamorphism of the overlapping transformation and the development of regional structure, can be divided into basement metamorphism and two major metamorphic Himalayan metamorphism. Taking Nyalam-Zhangmu profile as an example, the former is formed from the north to the south from the biotite to the kyanite belt, forming a complete progressive metamorphic series. This metamorphic belt stretches along the Himalayan fold system for more than 1000 km . Distribution in our country wide range from 30 to 60km, but the lithology is stable, can be recourse contrast, showing the extensive and stable basement metamorphism in our country to kyanite to black cloud