准噶尔盆地南缘霍尔果斯-玛纳斯-吐谷鲁断裂晚新生代构造变形的ESR测年证据

Electron Spin Resonance Dating of the Late Cenozoic Deformation of the Huoerguosi-Manas-Tugulu Reverse Faults along Southern Edge of Junggar Basin

本文对准噶尔盆地南缘霍尔果斯 玛纳斯 吐谷鲁逆断裂带中石膏、石英脉和断层泥进行了ESR测年研究。结果表明,霍尔果斯 玛纳斯 吐谷鲁逆断裂带主要经历了3个发展阶段,逆断裂带形成于15 0 0ka前,在4 0 0～10 0 0ka和80～12 0ka期间进行了再调整。断裂活动时间与青藏高原阶段性隆升时间一致,说明准噶尔盆地南缘霍尔果斯玛纳斯 吐谷鲁逆断裂带的形成与青藏高原的隆升过程密切相关,晚新生代天山山脉的隆升和前陆盆地的构造变形应为印度和欧亚两大板块碰撞的远程效应。

This paper focuses on the late Cenozoic deformation of the Huoerguosi-Manas-Tugulu reverse fault zone in the southern edge of Zhungaer basin. Twelve gypsum, fault gouge and quartz vein samples with different stuuctural significances were collected and dated by using the Electronic Spin Resonance (ESR) method. The results show that the Huoerguosi-Manas-Tugulu reverse faults has subjected to three major phases of deformation. The onset of reverse faults formation is at about 1500 ka ago and the reverse faults readjusted at 400～1000 ka and 80～120 ka, respectively. These data, along with evidence foruplift phases in Tibetean platean, support the model that relate reverse faulting to uplift processes occurring within the Tibetan plateau and that the late Cenozoic uplif-ting of Tianshan Mountain and tectonic deformation of foreland basins are the results of the collision between India and Eurasia plates.