西藏尼木南北向活动构造带的初步研究

西藏尼木南北向活动构造带是西藏高原上著名的当雄—羊八井—多庆错活动构造带的组成部份,具有强烈的第四纪活动性。它由活动断裂和裂陷型断陷盆地两大部份构成。盆地内的地貌特征显示它在第四纪持续沉降的特点。该带中的活动断裂主要有两组,即南北向和北北东向。第四记的强烈活动在带内留下了众多的断错地貌现象,南北向活动断裂的主要活动时期较早,在更新世。北北东向活动断裂的主要活动时期较晚,在全新世。

INITIAL RESEARCH ON THE NORTH-SOUTH ACTIVE FAULT ZONE OF NI MU IN TIBET

The north-south active fault zone is one part of the famous active Dangxiong-Yangbajing-Doqing fault zone in Tibet. Strong activing in Quaternary period occured in the fault zone,which is composed of active faults and fault depressions. The landforms characteristics in depressions show the special feature of continued subsidence in Quaternary period. Two active faults are north-south faults and north north-east faults. The strong activing in Quaternary period has left many landforms phenomenon along the fault zone. The main active period for north-south active fault is earlier. It is in Pleistocene Epoch. But the main active period for north north-east active faults is later. It is in Holocene Epoch.