龙陵-瑞丽断裂带附近的构造地貌与断裂活动性

doi:10.3969/j.issn.0253-4967.2014.02.013

摘要/Abstract

摘要： 利用ALOS全色、ASTER多光谱遥感影像和SRTM数字高程模型数据解译，并结合野外地质调查和实时差分GPS测量，对龙陵-瑞丽断裂带晚第四纪活动的构造地貌和地质特征进行了研究。综合遥感解译、构造地貌和地震地质调查的结果认为，龙陵-瑞丽断裂带是一条以左旋走滑作用为主的断裂，在晚第四纪具有一定的活动性；并确定了龙陵-瑞丽断裂带各活动段落的空间分布情况。选取朱家寨一带开展了探槽挖掘工作。探槽很好地揭露了基岩中发育的新鲜断层面和晚第四纪冲洪积层，但是未发现断层错动晚第四纪沉积物的迹象。采集了冲洪积层底部的植物化石进行了¹⁴C测年，结果为（1150±30）a BP。据此推测，从距今1150年以来，龙陵-瑞丽断裂带活动断层在北段未再发生过破坏性古地震事件。综合分析1976年龙陵地震的发震特点，认为1976年发生在龙陵的大地震未发生在龙陵-瑞丽断裂带上，其震源机制解和余震分布特征表明地震活动与NNW向展布的新生断裂带活动有关，这很有可能造成了NE向龙陵-瑞丽断裂带晚第四纪构造活动性减弱。

关键词: 龙陵-瑞丽断裂带, 晚第四纪, 构造地貌, 左旋走滑, 古地震

Abstract: Longling-Ruili Fault zone(LRF)is located at the boundary between China and Burma, striking in northeast direction for about 135 km and controling the formation and evolution of Longling, Luxi, Zhefang and Ruili Basins. This study utilizes the high-resolution remote sensing data, such as ALOS and ASTER and SRTM digital elevation model data in combination with field work and RTK-GPS(Real Time Kinematic-Global Positioning System)to present the tectono-geomorphic features and geologic structures along the LRF. Analysis from the remote sensing data reveals that the LRF always develops along the south and north edges of the basins, and forms the NE-striking linear mountains and valleys between the basins, with a general strike in N55°E direction. In the field, many geomorphic features, including saddle-shaped landform, fault facets and shutter ridges, are developed along the LRF;While at Xintangfang and Ganlanpo, a several meters-wide shear zone crops out with fresh fault gouge. All the descriptions above demonstrate that the LRF is sinistral strike-slip fault and has been active since late Quaternary.To gain more insight into the activity of the LRF, a trench was excavated at Zhujiazhai which reveals the fresh fault plane at the base rocks and late Quaternary alluvial deposits above, but no evidence found indicating the fault offset those young deposits. Radiocarbon dating of charcoal samples from the bottom of alluvial fans indicates that there is no destructive earthquake happening along the north segment of LRF since 1150 B.P. Finally, analysis for the 1976 Longling earthquake and distribution of historical earthquake imply that the 1976 destructive earthquake may be triggered mostly by the NNW-striking newly formed fault zone rather than the NE Longling-Ruili Fault zone.

Key words: Longling-Ruili Fault, late Quaternary, tectono-geomorphology, sinistral strike-slip, paleoearthquake

中图分类号:

P315.2

贺根文, 付碧宏, 刘鸣, 杨顺虎, 时丕龙, 刘锋. 龙陵-瑞丽断裂带附近的构造地貌与断裂活动性[J]. 地震地质, 2014, 36(2): 434-448.

HE Gen-wen, FU Bi-hong, LIU Ming, YANG Shun-hu, SHI Pi-long, LIU Feng. LATE-QUATERNARY DEFORMATION AND GEOMORPHIC FEATURES ALONG THE LONGLING-RUILI FAULT[J]. SEISMOLOGY AND GEOLOGY, 2014, 36(2): 434-448.

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