西藏江孜雅鲁藏布江结合带南缘断层带特征  

The Fault Zone on the Southern Margin of the Yarlungzangbojiang Juncture

作　　者：王一伟[1] 谢启兴[1] 白富正[1] 梅刚[1] 

机构地区：[1]四川省地质矿产勘查开发局川西北地质队,四川绵阳621000

出　　处：《四川地质学报》2016年第1期3-6,13,共5页Acta Geologica Sichuan

摘　　要：雅鲁藏布江结合带南缘断层是雅鲁藏布江结合带与喜马拉雅地层区分区断层,大致呈东西向延伸。在西藏江孜县地区断层上盘为三叠系朗杰学群复理石沉积,表现为北东向褶皱和北东向逆冲断层组合;断层下盘为中生代地层褶皱冲带,以东西褶皱构造为主。断层带在江孜县白沙帕夏村以西出露宽约150m,划分出9个结构带,表现为强弱不等的韧脆性变形特征,断层面呈高角度"铲"式逆冲断层,断层倾向北西,走向北东东,断层性质为逆断层;断层微观运动方式以粘滑,断层最新的活动年龄中更新世。The Fault on the southern margin of the Yarlungzangbojiang juncture lies between the Yarlungzangbojiang Juncture and the Himalayan stratigraphic division. In the Gyangzê region, the fault zone occurs as NE-trending fold and thrust association with the hanging side composed of flysch formation of the Triassic Namgyaixoi Group and the heading wall composed of the EW-trending Mesozoic fold-thrust zone. At Baishapaxia Village, Gyangzê, the fault zone is a high-angle thrust fault characterized by ductile-brittle deformation with a width of 150 m. The last faulting activity took place during Miocene-Pleistocene.

关 键 词：断层带 喜马拉雅地层区 结合带 雅鲁藏布江 

分 类 号：P548[天文地球—构造地质学]