塔里木盆地顺北5号走滑断裂隆起段发育特征与演化机制

顺北5号带作为一条贯穿两大古隆起的主干走滑断裂带，可分为四段：北段、中段、南段以及隆起段，一直以来是塔里木盆地顺北地区及邻区走滑断裂体系形成及演化的研究重点。利用最新采集处理的高精度三维地震资料，开展顺北5号带隆起段精细解析，厘定其几何学和运动学特征，揭示顺北5号带形成演化过程。基于走向角度变化与分段变形样式，可将隆起段分为3段：隆Ⅰ“平移”段（NE16°）、隆Ⅱ“拉分”段（NE19°）、隆Ⅲ“压隆”段（NE25°）。隆起段自下而上发育高陡走滑断层与多套雁列正断层组合的分层变形样式，共经历了加里东中期、加里东晚期、海西中-晚期和印支期—喜马拉雅早期多期走滑活动，在研究区内表现为“隆Ⅱ、Ⅲ段强，隆Ⅰ段弱”的活动特征。受SN差异应力传递影响，顺北5号断裂隆起段和南段初期以塔中Ⅰ号断裂带为界自南向北左行走滑，北段和中段自北向南右行活动，最大主应力发生了NW向到NE向偏转；加里东晚期后，顺北5号断裂整体左行走滑；印支期—喜马拉雅早期，顺北5号断裂隆起段反转为右行走滑活动，最大主应力方向由NW向转为NE向。

Development characteristics and evolution mechanism of the uplifted segment of the No. 5 strike-slip fault zone in Shunbei area， Tarim Basin

The No. 5 fault zone in Shunbei area， a main strike-slip fault zone running through two paleo-uplifts and being devided into north， middle， south and uplifted segments， has always been the focus of research on the formation and evolution of the strike-slip fault system in Shunbei area and its surroundings. In this study， the latest high-precision 3D seismic data newly acquired and processed are applied to carry out the fine analysis of the uplifted segment of the No. 5 fault zone in Shunbei area， determining its geometric and kinematic characteristics and revealing its formation and evolution process. According to the change of strike angle and segmented deformation pattern， the uplifted segment of the study area can be divided into three sections： the north translational section （NE16°）（uplifted segementⅠ）， the middle pull-apart section （NE19°）（uplifted segment Ⅱ）， and the south compressional-uplifted section （NE25°）（uplifted segment Ⅲ）. The uplifted segment in the study area develops a layered deformation pattern composed of high and steep strike-slip faults and multiple suites of en echelon normal faults from bottom to top， while undergoing multi-stage strike-slip activities during the Middle Caledonian， Late Caledonian， Middle-to-Late Hercynian and Indosinian-Early Himalayan periods. In the study area， the strike-slip activities feature “strong in the segments Ⅱ and Ⅲ， weak in the segment Ⅰ”. Under the influence of stress transmission from south to north， the south and uplifted segments present sinistral strike-slip from south to north with No. 1 fault zone in Tazhong area as the boundary at the initial stage of development， while the north and middle segments present dextral strike-slip from north to south， with the maximum principal stress deflecting from NW to NE. After the Late Caledonian period， the No. 5 fault zone in Shunbei area presented sinistral strike-slip as a whole， while during the Indosinian-Early Himalayan periods， the uplifted segment reversed to dextral strike-slip， with the maximum principal stress reversing from NW to NE.