滇西南打洛断裂晚第四纪活动特征
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国家自然科学基金项目(41572197);第二次青藏高原综合科学考察(SQ2019QZKK 2801)


Characteristics of Late Quaternary Activities along theDaluo Fault in Southwest Yunnan Province
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    摘要:

    滇西南打洛断裂位于青藏高原向SE方向物质挤出的最前端,其构造活动记录了青藏高原东南缘最新构造活动信息。通过卫星影像分析、现场追踪调查、探槽开挖、年代样品测试、断错微地貌高精度测绘等工作,对打洛断裂晚第四纪活动特征进行深入研究。结果表明,打洛断裂是一条全新世活动的左旋走滑断裂,晚第四纪水平滑动速率上限值为(2.5±0.1)mm/a,下限值为(0.8±0.1)mm/a,平均约(1.7±0.9)mm/a。假定断裂滑动速率基本保持恒定,根据沿断裂地质体最大位错约(11.2±0.5)km,估算其走滑活动构造转换时代应为(4.4~14.9)Ma B.P.。断裂最近一次构造活动时间为(360±30)a~(850±30)a B.P.。

    Abstract:

    The Daluo fault is located in southwestern Yunnan Province at the front of SE-oriented material extruded from the Tibetan Plateau, and it is responsible for the latest tectonic activity recorded in the southeastern margin of the Tibetan Plateau. Through satellite image analysis, a field investigation, trench excavation, dating sample testing, and high-precision mapping of dislocated micro-geomorphology, the characteristics of the late Quaternary activities of the Daluo fault are studied in detail. The results show that the Daluo fault is a Holocene active left-lateral strike-slip fault. The upper limit value of the horizontal slip rate of the fault in the late Quaternary is (2.5±0.1) mm/a, the lower limit value is (0.8±0.1) mm/a, and the average is about (1.7±0.9) mm/a. According to the maximum dislocation along the fault[about (11.2±0.5) km], it is estimated that if the slip rate of the fault has remained constant, the time of strike-slip structural transformation activity occurred in 4.4-14.9 Ma B. P, and the latest paleoseismicity of the fault occurred between 360±30 and 850±30 B. P.

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高效东,王爱国,袁道阳,谢虹,邵延秀,刘炳旭.滇西南打洛断裂晚第四纪活动特征[J].地震工程学报,2020,42(1):157-167. GAO Xiaodong, WANG Aiguo, YUAN Daoyang, XIE Hong, SHAO Yanxiu, LIU Bingxu. Characteristics of Late Quaternary Activities along theDaluo Fault in Southwest Yunnan Province[J]. China Earthquake Engineering Journal,2020,42(1):157-167.

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  • 收稿日期:2019-04-08
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  • 在线发布日期: 2020-03-16