高校地质学报2025，Vol.31Issue(2)：213-228,16.DOI:10.16108/j.issn1006-7493.2024050
库车坳陷秋里塔格构造带中段变形特征及构造意义:基于野外调查和地震剖面构造解析
Deformation Characteristics and Structural Significance of the Middle Qiulitage Structural Belt in the Kuqa Depression:Based on Field Investigation and Structural Interpretaion of Seismic Profiles
摘要
Abstract
The middle Qiulitage structural belt(Zhongqiu belt)in the Kuqa Depression is located in the overlapping area of the Kumugeliemu(K1-2 km)salt and Jidike(N1 j)salt.Divided by the Yanshui river of the Zhongqiu belt,significant differences in structural deformation styles are presented on the eastern and western sides,inferred that there are structural transformation characteristics.Based on field geological investigations and structural interpretation of seismic profiles,the structural characteristics of the Zhongqiu belt are analyzed in detail,and the structural transformation characteristics of the Zhongqiu belt are further determined,and the differentiated structural transformation mechanism between the suprasalt and subsalt strata is clarified.The results show that the suprasalt strata in the Zhongqiu belt experienced two stages of structural evolution.The first stage was dominated by folding deformation from the end of the Kangcun Formation(N1k)to the early Kuqa Formation(N2k),primarily forming the Kuqa-Tawu anticline and southern Qiulitage anticline arranged in an offset pattern in the Zhongqiu belt.The second stage was primarily dominated by thrust faulting from the early N2k to the Quaternary.Under the effect of fault activities,the anticlines were further uplifted and deformed,gradually forming the front zone,uplift zone,torsional core zone,and gentle slope zone,distributed sequentially from south to north in the Zhongqiu belt.The structural deformation of the torsional core zone is the most severe,and the different structural styles on the eastern and western sides indicate that strike-slip faults may develop in this zone to release the compression-torsion stress caused by the differential displacement on both sides.The structural transfer model of suprasalt strata in the Zhongqiu belt is characterized as a synthetic type,where displacement is transferred between faults with similar dip angles,leading to features such as twisting and branching of surface folds.The subsalt structural transformation is mainly accomplished by the variation of the extension distance of thrust faults along strike and the variation of fault dip angles.The structural transformations in both suprasalt and subsalt strata are influenced by salt layers.The multi-layer distribution and thickness variations of salt layers in the east-west direction are key factors contributing to the differential development locations of the Kuqa-Tawu anticline and southern Qiulitage anticline.The subsalt faults of the southern Qiulitage anticline extend farther to the south under the control of double salt layers(K1-2km and N1 j salt layers),whereas the subsalt faults of the Kuqa-Tawu anticline,controlled by a single salt layer(N1 j salt layer),have relatively shorter extension distances.关键词
构造转换带/构造解析/盐构造/构造转换机制/库车坳陷Key words
structure transfer zone/structural interpretation/salt-related structure/structural transfer mechanism/Kuqa Depression分类
地质学引用本文复制引用
张治鑫,尹宏伟,吴珍云,邓寒潇,汪伟,王洪艳,贺婉慧,李慧欣,毛可奕,董少春..库车坳陷秋里塔格构造带中段变形特征及构造意义:基于野外调查和地震剖面构造解析[J].高校地质学报,2025,31(2):213-228,16.基金项目
深地国家科技重大专项课题(2024ZD1003306) （2024ZD1003306）
国家自然科学基金(41602208、42372264和42072320) （41602208、42372264和42072320）
江西省教育厅科学技术研究项目(GJJ210702)及东华理工大学博士启动基金项目(DHBK2019053)联合资助 （GJJ210702）
