新疆太古宙变质岩系岩石组合特征

新疆塔里木盆地周边发育前寒武纪变质岩系，其太古宙变质岩系分布在库鲁克塔格－星星峡及阿尔金山前。铁克力克可能有新太古代变质岩系的存在。库鲁克塔格地区太古代变质岩出露较全，由古－中太古代及新太古代变质岩组成：阿尔金山前、南天山及中天山尾亚地区均有新太古代变质岩系分布。太古代变质岩系由表壳岩和变质深成岩（岩系）组成，前者往往呈规模不等的包体散布在变质深成岩中。变质作用主要为区域中高温变质作用和区域动力热流变质作用，变质相为中深变质的角闪岩相－麻粒岩相，具中深部构造相的塑性流变特征。

FEATURES OF LITHOLOGIC ASSOCIATION OF ARCHEAN METAMORPHIC ROCKS IN XINJIANG

The Precambrian metamorphic rocks are developed at the margins of Tarim basin of Xinjiang, among which the Archean metamorphic rocks are distributed in Kuruktag-Xingxingxia area and Altun forelands. The neo-Archean rocks possibly exist in Tieklik metamorphic rocks. The metamorphic rocks in Kuruktag with dated isotopic ages are completely exposed and comprise paleo-to meso-Archean and neo-Archean rocks. The neo-Archean rocks also exist in Altun forelands, South Tianshan area, and Weiya area of Central Tianshan. The Archean metamorphic rocks are composed of extrusive rocks and metamorphosed plutonic rocks. The former usually exists as inclusions of various size in the latter. The regional high-temperature metamorphism and regional dynamic hydrothermal metamorphism are the predominant ones. The metamorphic facies is intermediate to high with hornblend-granulite facies. Features of plastic flow of middle to great depth are present.