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在四川南部地区发现了从通安延伸到小关河的蛇绿混杂带,它可能代表了元古代的一条碰撞缝合带。这条东西延伸的缝合带的证据是:1.残留洋壳经消减、冲断形成的蛇绿混杂带;2.该带两侧的地层有明显的差异;3.强烈变形的冲断褶皱带;4.变质程度在两侧有明显的不同;5.有类似于阿巴拉契亚山带的夹心糕式模式,依次为南部的被动边缘的俯冲表壳岩系、中间的蛇绿混杂带和北部的上冲基底。上述证据说明通安-小关河蛇绿混杂带代表了两个陆壳地质体的碰撞缝合带,碰撞事件的年龄大约为距今1000Ma。
An ophiolitic melange extending from Tongan to Xiao Guanhe was discovered in the southern part of Sichuan Province. It may represent a Proterozoic collision suture. Evidence of the suture that this thing is extending is: 1. The ophiolite mixed belt formed by the reduction and thrusting of the remaining oceanic crust; 2. The strata on both sides of the belt have obvious differences; 3. The severely deformed thrust fold belt ; 4. The degree of metamorphism is significantly different on both sides; 5. There are sandwich-cake patterns similar to the Appalachian Mountains, followed by the subducted crustal rocks along the passive margin in the south, And the north of the red base. The above evidence indicates that the Tong’an-Xiao Guanhe ophiolite belt represents the collision suture of two continental crustal geologic bodies with an age of approximately 1000 Ma dating from now.