The Structural Styles And Discussion On The Age Of Sela Formation In The Accretionary Complex Of The Yarlung Zangbo River Suture Zone

The article research ’ s subjects are geological features of Luo Lin group complex and Sela Formation in the Yarlung Zangbo River suture.Luo Lin group complex is a set of more intense deformation, green schist phase change unordered flysch formations, built for a typical dive accretionary wedge. Luo Lin group complex points under the four formation from north to south : Sangdong formation（T₃s.）, Pumu formation（T₃p.）Jiangre formation（T₃j.）and Banglang formation（T₃b.）. The rock combination can be divided into two categories: One kind is the ophiolite tectonic melange, another kind is Tectonic rock formation.Salad formation（C_s） is given priority to with fine clastic rock, a large number of basic rock mass, among various lithology are all strongly mylonite zone, Early metamorphism of high greenschist facies- low amphibolite facies, Late the common low greenschist facies retrograde metamorphism, Partial of the formation has early metamorphism residues. Salad formation（C_s） constructs invasion in Luo Lin group complex, it east-west lies between Jiangre formation and Banglang formation, it’s a metamorphic terrane being squeezed out of a deep during main collision period.Sela formation there is a single and stable new foliation S₂. North of the border fault shelving, south around 30 ° Angle. In addition, Salad formation has a structure influence on adjacent formations:one,At the south side of Sela and Banglang of the both sides of the boundary fault in the formation of almost every can be seen at the same time performances on outcrop thrust and decline in two phenomena;two, Sala formation to Jiangre formation has obvious upward on the northern side of drawing deformation. I through isotopic dating method analyzes the age of Sela formation, draw Sela’age at about 360 ma, tentatively for Carboniferous. This paper discusses the tectonic significance of Sela formation and Luo lin group complex,and know Sela is taken into the deep underground during the Subduction stage. it’s a metamorphic terrane being squeezed out of a deep during main collision period.