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| Development and evolution of Shenxian Mountains overthrust nappe structure in the middle and north section of Taihang Mountains |
| HE Jiaoyue, WANG Jingui, SHEN Zongyi, GUO Bin, CHEN Yuanyuan, JI Hong, ZHANG Liguo, ZHANG Pengcheng |
| Regional Geological Survey Institute of Hebei Province, Langfang 065000, China |
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Abstract The deformation characteristics, evolution mechanism and metallogenic relationship of overthrust nappe structure in Taibaiwei Mountains which is the main ore-controlling factor of polymetallic deposits in the middle and north section of Taihang Mountains, have been studied in detail by predecessors, but Shenxian Mountains overthrust nappe structure in southeastern Taihang Mountains is rarely studied. Based on the first-hand data in the field, the geometrical characteristics of the overthrust nappe structure in Shenxian Mountains were statistically analyzed. The distribution, occurrence pattern, deformation mechanism of each unit (Feilai Peak, overthrust nappe fault, exotic rock series (nappe) and autochthone) were analyzed. And the kinematics characteristics were studied based on the assemble pattern, the development thickness of relevant stratum, and the geometric relationship between each overthrust nappe fault and cut stratum. The overall nappe direction of the overthrust nappe structure in Shenxian Mountains is from NW to SE, with the average distance of total thrust about 23.3km. Combined with the precedence relationship between the geological body cut by the nappe structure and the covered and reconstructed performance, the authors discussed the development and evolution process of the overthrust nappe structure in Shenxian Mountains. This overthrust nappe structure has gone three stages, namely the initial activity in Middle and Late Hualixi - Early Yanshan Period, main development in Middle and Late Yanshan Period and reform activity in Late Himalaya Period, which provides tectonic geological data for further study on the strata, magmatic rocks, and the relationship between minerals and structures in this overthrust nappe structure belt.
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Received: 08 April 2019
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2020, Vol. 7 
