CAJ | 학술논문

塔西南新生代前陆盆地受西昆仑山造山带南北向挤压和帕米尔弧形构造带向北突进的影响，导致盆山结构与盆地冲断带构造变形在平行造山带方向表现出明显差异。本文通过地震资料解释，系统研究了塔西南新生代前陆盆地东段盆山结构与冲断带的构造变形特征，认为塔西南新生代前陆盆地东段盆山结构表现为西昆仑造山带向北大规模冲断，盆地区挠曲沉降，前陆地区发育宽的褶皱冲断带，冲断带前锋已扩展至捷得背斜一线，褶皱冲断带与前渊坳陷存在大范围重叠。盆地东段的褶皱冲断带在纵向上可以分为基底卷入变形带、滑脱变形带。山前第一排变形带受多期构造叠加影响，产生横向变形的分异：西段柯东段早期为构造楔形体变形形成的背斜构造，后期被甫沙–克里阳右行走滑断裂改造，剖面呈现复杂的变形特征；东段克里阳段构造变形以早期的逆冲推覆为主。结合生长地层与磁性地层分析，冲断带的变形总体表现出前展式的构造变形特征，上新世阿图什组沉积期开始形成柯东构造带；随后变形向北传播，在上新世早中期形成柯克亚构造带；至早中更新世晚期，构造变形扩展至固满–合什塔格构造带。
탑서남신생대전륙분지수서곤륜산조산대남북향제압화파미이호형구조대향북돌진적영향，도치분산결구여분지충단대구조변형재평행조산대방향표현출명현차이。본문통과지진자료해석，계통연구료탑서남신생대전륙분지동단분산결구여충단대적구조변형특정，인위탑서남신생대전륙분지동단분산결구표현위서곤륜조산대향북대규모충단，분지구뇨곡침강，전륙지구발육관적습추충단대，충단대전봉이확전지첩득배사일선，습추충단대여전연요함존재대범위중첩。분지동단적습추충단대재종향상가이분위기저권입변형대、활탈변형대。산전제일배변형대수다기구조첩가영향，산생횡향변형적분이：서단가동단조기위구조설형체변형형성적배사구조，후기피보사–극리양우행주활단렬개조，부면정현복잡적변형특정；동단극리양단구조변형이조기적역충추복위주。결합생장지층여자성지층분석，충단대적변형총체표현출전전식적구조변형특정，상신세아도십조침적기개시형성가동구조대；수후변형향북전파，재상신세조중기형성가극아구조대；지조중경신세만기，구조변형확전지고만–합십탑격구조대。
The Cenozoic foreland basin at the southwestern Tarim basin was inflicted by both N-S compression of the west Kunlun orogen and northward indentation of the Pamir, which led to significant variations in structural architecture and deformation style. New results from interpretations of seismic profiles in the east segment of the basin are presented here to discuss such spatial variation in structural deformation and temporal variation in structural evolution. The results suggest that the segment commonly exhibits significant northward thrusting, coupled with flexural basin subsidence. Broad fold-and-thrust belt (FTB) is evidenced in the profiles with its front reaching Jiede anticline, resulting in a structural architecture of superposition of the FTB and foredeep of the flexural basin. In the vertical view, the segment is featured by basement-involved deformation belt overlain by detachment deformation belt. The first row of the deformation belt presents spatial variation in structure. The west Kedong portion exhibits anticlines controlled by thrust wedge that has been reworked by dextrally strike-slipping. In contrast, the east Keliyang portion is featured by mainly thrust deformation. Combined with the results from growth strata and magnetostratigraphy, we suggest that the segment presents a northwardly forward breaking pattern, with the deformation occurring along the Kedong belt during the early Pliocene, within the Kekeya belt at early-to mid-Pliocene and in the Guman-Heshitage belt during early-to mid-Pleistocene.