Determination of the Timing of Active Structures in Haiyuan-Liupan Shan Area: Constraints from OSL Dating
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摘要: 海原-六盘山地区位于现今青藏高原东北部, 该地区活动构造的研究不仅可以为地震安全评价提供依据, 也可以为第四纪青藏高原的扩展提供限定.在野外地质调查的基础上, 运用光释光定年技术, 限定研究区活动构造的活动时间.研究显示, 海原-六盘山断裂和香山-天景山断裂在晚第四纪存在剧烈活动, 产生了如角度不整合(夷平面)、褶皱和断层构造.这些结果表明, 研究区应该作为地震安全评价的重点关注区域, 同时也显示青藏高原东北部在晚第四纪存在持续的扩展.Abstract: Haiyuan-Liupan Shan area is located in the northeastern margin of present Tibetan plateau. The study of the active structures in this area will provide constraints not only for the seismic evaluation but also for the northeastward growth of the plateau. Based on the geological survey and optically stimulated luminescence (OSL) dating, the timing of the active structures has been determined. The results indicate that active structures occurred in Late Quaternary along the Haiyuan-Liupan Shan and Xiangshan-Tianjing Shan faults, forming the structures such as angular unconformity (planation surface), fold and fault. This suggests that Haiyuan-Liupan Shan area should be considered as a focus of seismic evaluation, and also that the Tibetan plateau grew in its northeast margin in Late Quaternary.
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图 1 海原-六盘山地区地质简图及剖面位置(据林秀斌等，2009)
Fig. 1. Simplified geological map of Haiyuan-Liupan Shan area and the section locations
图 3 寺口子剖面逆冲断层野外露头、构造解释及光释光采样位置
Fig. 3. Outcrop of the thrust faults, their structural interpretation and OSL sampling locations of Sikouzi section
图 4 车家湾剖面野外露头、构造解释及光释光采样位置
Fig. 4. Outcrop, its structural interpretation and OSL sampling locations of Chejiawan section
图 5 小洪沟剖面构造剖面及光释光采样位置(林秀斌等，2009)
Fig. 5. Structural section and OSL sampling locations of Xiaohonggou section
表 1 光释光样品测年结果
Table 1. OSL dating results
剖面 样号 U(10-6) Th(10-6) K(%) 含水量(%) 环境剂量(Gy/ka) 等效剂量(Gy) 年龄(ka) 寺口子 06-6-5-A 5.93±0.17 11.55±0.25 2.54 20±3 4.82±0.23 70.7±6.8 14.7±1.6 寺口子 06-6-5-B 6.01±0.17 11. 760.26 2.50 20±3 4.83±0.24 72.1±6. 7 14.9±1.6 寺口子 06-6-5-C 4.72±0.15 12.50±0.28 2.26 20±3 4.33±0.21 638.2±23.9 147.5±9.0 寺口子 06-7-2-A 2.79±0.11 11.06±0.24 1.96 20±3 3.41±0.16 90.1±2.4 26.4±1.4 寺口子 06-7-2-B 2.76±0.11 10.95±0.24 1.87 20±3 3.32±0.15 97.3±2.4 29.3±1.5 寺口子 06-7-2-C 2.70±0.11 10.15±0.22 1.93 20±3 3.29±0.15 127.4±1.8 38.7±1.8 车家湾 06-8-4-A 1.91±0.11 11.25±0.25 2.00 20±3 3.21±0.14 12.8±0.7 4.0±0.3 车家湾 06-8-4-B 2.44±0.11 11.72±0.26 2.34 20±3 3.68±0.16 89.8±1.4 24.4±1.1 车家湾 06-8-4-C 3.33±0.13 15.71±0.33 1.97 20±3 3.95±0.19 37.3±4.1 9.4±1.1 小洪沟 06-10-3-A 2.72±0.11 10.54±0.23 1.34 20±3 2.97±0.15 321.5±14.1 108.3±7.3 小洪沟 06-10-3-B 3.17±0.10 9.95±0.22 1.69 20±3 3.08±0.14 151.6±5.9 49.2±3.0 
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