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西大滩混杂堆积,出露于东昆仑中段南缘,青藏公路的西大滩南侧之煤矿沟(图1)。秦德余、李光岑1976年首次认为是混杂岩,但未做描述。青海区调一队四分队在填图时也注意了这一现象。笔者根据他们提供的线索,对该混杂堆积进行了观察和描述。 根据野外收集的实际资料,笔者认为西大滩混杂堆积是滑塌混杂堆积,它向东、西延伸而为混杂堆积带,依混杂岩块的岩性种类及空间分布关系,由南到北可划分三个混杂堆积层,三层在成因上互有联系。
West Bank mixed deposition, exposed in the southern edge of the middle east Kunlun, Qinghai-Tibet Highway on the south side of the large coal mine ditch (Figure 1). For the first time in 1976, Qin Deyu and Li Guangcen considered melange but did not describe it. Qinghai District transferred a team of fourth unit in the mapping also noticed this phenomenon. Based on the clues they provided, the author observed and described the mixed heaps. According to the actual data collected in the field, the author thinks that the mixed sediment of Xidatan is a mixture of slump, which extends to the east and west for a mixed accumulation zone. Depending on the lithology and spatial distribution of the mixed rock, Divided into three mixed layers, the three layers in the cause of each other.