| 修沟-玛沁断裂 |
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| THE XUGUI-MAQIN FAULT |
| The Xiugou-Maqen fault in central Qinhai Province has attracted interest of the Chinese and foreign geologists for many years.Based on previous research results and the author's field investigation this artiele provides a summary in three aspects of the fault,including its geomorphologic features, activity and relation with the Kunlun latitudinal system.The Xiugou-Maqen fault appears as a wide valley geomorphologically. The early and late stages of the activity of the faultmay be distinguished. In the early stage, the north wall of the fault moved towards the southeast relative to the south wall, while in the late stage, the south wall moved towards the southeast, accompanied by extension and down faulting.As to the relation between the Xiugou-Maqen fault and the Kunlun latitudinal system, the author believes that:l) the presence of the Permo-Carboniferous rocks within the Triassic strata in the Buqing-Anymaqing Mountain has no necessary connection with the formation of the Xiugou-Maqen fault; and 2) the Xiugou-Maqen fault is a transitional zone between the Kunlun latitudinal system and the Bayan Har NW-trending shear system, and its formation and evolution marked the end of the history of the Paleozoic Kunlun latitudinal system and the birth of the Mesozoic shear system in the northeastern part of the Qinghai-Xizang Plateau. |
| LAO Xiong.1989.THE XUGUI-MAQIN FAULT[J].Acta Geoscientica Sinica,11(1):1-7. |
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