Abstract: The Longling-Lancang fault zone is a newly emerging fault zone, which is composed of multisecondary faults, distributed in the obligate or clustered types, and characterized by the zoning of active faults, earthquake faults and earthquakes. Its kinematic feature is dextral extensive and the formation epoch is early-middle Pleistocene. It is still active in the later period. The rupture in the future tends to cut across the tectonically-blocked segment, discontinuous segment of the fault and then through the whole fault zone. The formation of the nealy emerging fault zone has close relation with the uplift of the Qingzang Plateau. The composite action by the material fluid from the north to the south and the intrusion of Asamu block towards northeast makes the Dianmian block to rotate in a counter-clock wise direction and forms a new dextral shear, NNW-trending fault zone in the central area of the block.

Key words: Southwest Yunnan, Newly emerging fault zone, Formation mechanism

摘要： 龙陵-澜沧断裂带是一条新生的断裂带,由多条斜列式或丛集式次级断层组成,以活断层、地震断层、地震成带分布为特征。运动性质为右旋-拉张。形成时代为早、中更新世,晚期继续活动。未来破裂趋势首先将断开那些构造闭锁段、破裂不连续段,然后使断裂带完全贯通。新生断裂带的产生与第四纪青藏高原加速隆起有关,由北而南滑移的物质流和阿萨姆楔体向东北方向挤入的共同作用,使滇缅块体产生反时针旋转,并在块体中间地带形成北北西向的新生断裂带。

关键词: 滇西南, 新生断裂带, 形成机制