CAJ | 학술논문

以方正断陷二维、三维地震资料和钻井资料为基础，追踪和闭合了盆内重要的新生代构造层序界面。富锦组底界面为区域性裂后不整合界面，将盆地的演化阶段划分为裂陷期和裂后期。在裂陷期的充填序列中，宝泉岭组底界面为盆内易于识别的区域性角度不整合界面，该界面将盆地的裂陷期进一步划分为裂陷Ⅰ幕和裂陷Ⅱ幕。本文通过对盆地结构构造及不同时期厚度特征的分析，重建了盆地的形成演化过程。研究结果表明，裂陷Ⅰ幕构造活动受NW-SE向的正向伸展应力控制，发育的E1w-E2d地层充填在简单地堑盆地中；裂陷Ⅱ幕的E3b时期以近SN向斜向伸展作用下形成的断阶式地堑结构为特征，盆地沉积-沉降中心位于盆内伊汉通断裂下降盘，且具有从北向南迁移的趋势。裂后期N1f时期以热沉降为主，并伴随有右旋走滑作用。另外，盆地的形成演化经历了三期反转改造过程，分别对应始新世晚期、渐新世晚期和上新世晚期。结合周缘板块的运动学重组事件，认为太平洋板块西侧俯冲方式的变化和印度-欧亚板块碰撞的远程效应联合控制了方正断陷新生代的形成演化过程。
이방정단함이유、삼유지진자료화찬정자료위기출，추종화폐합료분내중요적신생대구조층서계면。부금조저계면위구역성렬후불정합계면，장분지적연화계단화분위렬함기화렬후기。재렬함기적충전서렬중，보천령조저계면위분내역우식별적구역성각도불정합계면，해계면장분지적렬함기진일보화분위렬함Ⅰ막화렬함Ⅱ막。본문통과대분지결구구조급불동시기후도특정적분석，중건료분지적형성연화과정。연구결과표명，렬함Ⅰ막구조활동수NW-SE향적정향신전응력공제，발육적E1w-E2d지층충전재간단지참분지중；렬함Ⅱ막적E3b시기이근SN향사향신전작용하형성적단계식지참결구위특정，분지침적-침강중심위우분내이한통단렬하강반，차구유종북향남천이적추세。렬후기N1f시기이열침강위주，병반수유우선주활작용。령외，분지적형성연화경력료삼기반전개조과정，분별대응시신세만기、점신세만기화상신세만기。결합주연판괴적운동학중조사건，인위태평양판괴서측부충방식적변화화인도-구아판괴팽당적원정효응연합공제료방정단함신생대적형성연화과정。
Based on the 2D and 3D seismic data and drilling data in the Fangzheng Fault Depression, we tracked and outlined the important Cenozoic tectonic sequence interfaces in the basin. The bottom interface of the Fujin Formation is a regional post-rifting unconformity which divides the basin’s Cenozoic evolution into rifting and post-rifting stage. In the filling sequence of the rifting stage, the bottom interface of the Baoquanling Formation is also an easily identified regional angle unconformity dividing the rifting stage into two phases. Through analyzing the structural characteristics and the strata thickness of different stages in the Fangzheng Fault Depression, this paper reconstructed the formation and evolution of the basin. The results show that the study area was controlled by the NW-SE extending stress field in the rifting EpisodeⅠwith E1w-E2d strata filling in a simple graben basin;however, the stress field turned to nearly SN obliquely extending stress in the rifting Episode Ⅱ during E3b characterized by fault-stepped graben. Meanwhile, the sedimentary-subsidence center was located in the downthrown side of the Yihantong Fault with the trend of migration from north to south;the post-rifting stage during N1f was dominated by thermal subsidence and accompanied by dextral strike-slip. In addition, the formation and evolution of the basin experienced three contraction inversion processes during Cenozoic, corresponding to the late Eocene, the late Oligocene and the late Pliocene. Finally, combined with the global kinematics reorganization event of plates, we suggest that the subduction of the Pacific plate relative to Eurasian plate and India-Eurasia collision effects jointly controlled the formation and evolution of the Fangzheng Fault Depression during Cenozoic.