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古优地槽岩石组合往往难以得到完整保存的记录。蛇绿岩的上冲作用使得蛇绿岩的岩石层序受到破坏;消减作用又常使消减带的复理石岩系变形,成为关系复杂、断裂交错的冲断席;最后的弧带造山作用或碰撞造山作用(Coleman,1975;Dickinson,1977)又进一步使这些岩石褶曲、断裂,于是,原来的层序和面貌便难以辨认。 川西晚元古界的盐边群比较完整地保存了优地槽岩石组合的记录,由高家村顶顶向北沿胜利沟依次出露了蛇绿岩的下部堆晶岩、上部堆晶岩、辉绿岩墙群和夹有硅质岩与凝灰岩
Ancient excellent trough rock combination is often difficult to get a complete record of preservation. Opposite action of ophiolite causes the ophiolite rock sequence to be destroyed; and the depletion effect often deforms the subduction zone flysch rock complex to become a thrust pad with complex relationship and fault interlacing; the last arc orogeny Or collisional orogeny (Coleman, 1975; Dickinson, 1977) further furrowed and ruptured these rocks and the original sequence and appearance of the rocks were illegible. The Yanbian Group of the Late Proterozoic in western Sichuan preserved the record of the combination of the Yitong Trough rocks more completely. The lower part of the ophiolite and the upper part of the crust, Diabase dikes and siliceous rocks and tuffs