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一、概况 1973—1975年我们在北祁连山进行含铬基性-超基性岩体地质研究工作中,在玉石沟、三岔什和吊大坂超基性岩体中,观察到一种结构构造特殊的岩石。这种岩石多产在岩体的边部,岩石由大小不等,圆度完好的纯橄岩、斜辉辉橄岩、斜辉橄榄岩、变辉长辉绿岩、变质玢岩和结晶灰岩等砾体组成,砾间基质为强烈片理化了的蛇纹岩,形成蛇纹混杂岩。蛇纹混杂岩呈带产出,延展规模大小不一,长数十至数百米,宽数至数十米。本文拟对这种蛇纹混杂岩的产状、岩性特征及其成因等进行描述与讨论。
I. Overview From 1973 to 1975, we conducted a geological study on Cr-based basic-ultramafic rocks in the Qilian Mountains. In the Yushigou, Sanchashu and Dabanshan ultrabasic rocks, we observed a structural structure Special rock This type of rock is prolific on the margins of rock mass. The rock is composed of dunites of different sizes, good roundness, galena, erxite, gabbro, metamorphic pluton and crystalline ash Rock and other gravel composition, gravel matrix is strongly schistosity serpentinite, the formation of serpentine melange. Serpentine melange belt was a yield, the size of the extension of varying sizes, tens to hundreds of meters long, wide to tens of meters. This paper aims to describe and discuss the occurrence, lithology and genesis of this serpentine melange.