关键词: 雅鲁藏布江缝合带, 开合构造, 演化模式, 蛇绿混杂岩

Abstract:

Sage diverge of Yaluzangbu suture zone has been verified further in this article through the field investigation of ophiolite and mélange and the analysis of their lithochemistry and geochemistry. The model of evolution of  Yaluzangbu suture zone has been discussed. Yaluzangbu suture zone can be divided into two different epoch zones(the north zone and the south zone).This kind of model originated from the extension function in the course of Indian Plate drifting northward in Late Permian Period.Spread function of the south zone of the Yaluzangbu suture zone aggravated, followed ocean crust splitting and ophiolite emplacing from Late Triassic to Early Jurassic.After subducting and collisioning momentarily in both sides, Zhongba land had been welded. After Late Jurassic and Early Cretaceous, the north zone of the Yaluzangbu suture zone had been expanding, subducting again, till Late Eocene Epoch the whole Yaluzangbu suture zone had been collisioning and mountain-building and raising, the great Qinghai-Tibet Plateau had been formed.

Key words: Yaluzangbu suture zone, open-close structure, model of evolution, ophiolite complex