| 东昆仑南缘西大滩混杂堆积 |
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| 引用本文：朱志直,赵民,施立新.1984.东昆仑南缘西大滩混杂堆积[J].地球学报,6(3):129-135. |
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| 中文摘要:<正> 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。 |
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| THE XIDATAN MELANGE IN THE SOUTHERN MARGIN OF EAST KUNLUN MOUNTAINS |
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| Abstract:The Xidatan melange occurs in the fault-compressed zone of the southern margin of the East Kunlun Mountains, near the Kunlun pass, extending both east-and west-wards to a certain degree.The southern side of the melange is covered with the glaciers in the Kunlun Mountains, while the northern one is cut by a granite-porphyry body. It is exposed 1000 m in width and from south to north divided into three layers as follows.1. The exotic block layer of single composition: The exotic blocks are of only one rock type, i. e. sandstone occurring mostly as lens, while the matrices with clear bedding are grey-black argillaceous sandstone or arenaceous shale.2. The exotic block layer of two compositions: The exotic blocks are angular sandstone and limestone, while the matrices are grey-black arenaceous and argillaceous sediments. Both the blocks and matrix have been sheared and broken.3. The exotic block layer of several compositions:Besides sandstone and limestone, the exotic, blocks consist of conglomerate, granite, turbidite and slate. The matrices appear as"match sticks"in shape due to weathering.There are transitional relations between the three melange layers.The authors consider that the Xidatan melange belt is an olistostrome and the melange resulted from plate tectonic movements. According to the fossils found in the blocks and matrices of the Xidatan melange belt, the belt is considered to be formed during the Indo-Sinian period. |
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