GUO XiaoYu,
GAO Rui,
GAO JianRong et al
.2018.Integrated analysis on the tectonic features of the Maxian Shan fault zone in the northeastern Tibetan plateau.Chinese Journal Of Geophysics,61(2): 560-569,doi: 10.6038/cjg2018L0186
1. School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 3. The Research Institute of Petroleum Exploration and Development, Beijing 100083, China
Abstract：The sinistral strike-slip Maxian Shan fault zone is located within the interior of the north-easternmost Tibetan Plateau. It extends in northwest-southeast direction over a distance more than 115 km with widths 8~10 km. Although this fault zone is partly covered by widespread Quaternary losses, its tectonic activity is not necessarily low. One piece of evidence that the 1125 MS7.0 Lanzhou earthquake took place just at the west of the north edge of the Maxian Shan fault zone. Previous studies are mostly concentrated on the surface expression of this fault zone and geochemical analysis of the plutons on its both sides to delineate its traces, lacking the information on its extension at depth. In this work, we employed a NE-SW striking 310 km-long deep seismic reflection profile that crosses the Maxian Shan fault zone to reveal its deep structure. In combination with processing and analysis of the available gravity anomalies and previous geochemical studies, we suggest that the Maxian Shan fault zone is a block boundary that separates two different paleo-volcanic arcs of the Qilian orogenic belt. It formed during the amalgamation of these two paleo-volcanic arcs in Early Paleozoic. The Maxian Shan fault zone was later reactivated during northeastward extrusion of the Tibetan Plateau and remains tectonically active now.
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