| 天景山断裂带晚第四纪左旋走滑运动速率确定及其空间分布特征 |
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| 关键词:Tianjingshan fault zone Late Quaternary slip rate spatial pattern |
| 基金项目:国家重点研发计划(编号: 2017YFC1500101);中国地震局地质研究所基本科研业务专项(编号: IGCEA1723);第二次青藏高原科学考察研究(编号: 2019QZKK0901);国家自然科学基金项目(编号: 41590861, 41774049, 41602224) |
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| Determination and Spatial Pattern of the Late Quaternary Left-lateral Slip Rate of the Tianjingshan Fault |
| The Tianjingshan fault zone is one of the major block-bounding strike-slip faults in northeastern Tibetan Plateau. However, little is known about the spatial pattern of the left-lateral slip rate along the Tianjingshan fault zone. Based on the interpretation of satellite images and field investigation, the authors selected two typical sites in the central segment to constrain the fault slip rate, where the slip-rate ranges are poorly constrained. Firstly, the authors measured and restored the left-lateral offset of streams at Mengjiawan site and fluvial terraces at Yaoxiangou site using differential global positioning system and unmanned-aerial-vehicle photography. Then, the authors dated the ages of the displaced geomorphic surfaces using the optically stimulated luminescence dating method. Finally, the authors calculated and discussed the slip rates at the Mengjiawan and Yaoxiangou sites based on the analysis of the relationship between the offset features and geomorphic surfaces. The derived slip rates of the Mengjiawan and Yaoxiangou sites are (1.2±0.3) mm/a and (0.9±0.3)~(1.1±0.2) mm/a, respectively. Compared with previous results, the authors hold that the Late Quaternary left-lateral slip rate of the Tianjingshan Fault is stable at ~1.1 mm/a. |
| DONG Jin-yuan,LUO Quan-xing,LI Xin-nan,LI Chuan-you,YANG Hui-li,REN Guang-xue.2021.Determination and Spatial Pattern of the Late Quaternary Left-lateral Slip Rate of the Tianjingshan Fault[J].Acta Geoscientica Sinica,42(4):527-536. |
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