CAJ | 학술논문

莺歌海盆地周边新生代区域构造演化综合分析表明，该盆地形成和演化构造应力场分四个阶段：第一阶段，古新世末至早渐新世印支地块快速向南东方向挤出，同时伴随着地块的顺时针旋转运动。第二阶段，晚渐新世至早中新世印支地块向南东挤出运动逐渐减弱，华南地块整体仍然相对稳定。莺歌海盆地处于左旋剪切状态。第三阶段，中、晚中新世随着印度地块逐渐楔入欧亚板块内部，印支半岛的挤出运动进一步减弱。至中中新世末，华南地块整体开始挤出。第四阶段，上新世—第四纪印支地块相对稳定，华南地块挤出运动继续进行，两地块间的相对运动呈右旋剪切运动。莺歌海盆地新生代的构造应力场演化受太平洋板块、印度与欧亚板块之间相互作用控制。其中，印度与欧亚板块碰撞作用所导致的印支地块与华南地块的相对运动，是决定莺歌海盆地新生代构造运动应力场变化的主要因素。
앵가해분지주변신생대구역구조연화종합분석표 명，해분지형성화연화구조 응력장분사개계단：제일계단，고신세말지조점신세인지지괴쾌속향남동방향제출，동시반 수착지괴적순시침선전운동。제이계단，만점신세지조중신세인지지괴향남동제출운동축점 감약，화남지괴정체잉연상대은정。앵가해분지처우좌선전절상태。제삼계단，중、만중신 세수착인도지괴축점설입구아판괴내부，인지반도적제출운동진일보감약。지중중신세말， 화남지괴정체개시제출。제사계단，상신세—제사기인지지괴상대은정，화남지괴제출운동 계속진행，량지괴간적상대운동정우선전절운동。앵가해분지신생대적구조응력장연화수태 평양판괴、인도여구아판괴지간상호작용공제。기중，인도여구아판괴팽당작용소도치적인 지지괴여화남지괴적상대운동，시결정앵가해분지신생대구조운동응력장변화적주요인소。
Yinggehai basin is located in the northwest of South China Sea,and formed in the Cenozoic.The Cenozoic sedimentary thickness in the basin is more than 15km,therefore,the structural features related to rifting phase are difficult to reveal by seismic profiling.In order to understand its origin and evolution,we analysed the regional characteristics of the Cenozoic tectonic evolution surrounding Yinggehai basin,and obtained the Cenozoic tectonic stress field of the basin.The formation and tectonic stress field of Yinggehai basin can be divided into four phases. 　　The first phase,from the later Paleocene to the early Oligocene,Indochina block extru ded toward southeast fast,with a clockwise rotation movement.Yinggehai basin origined in this stage. 　　The second phase,from the later Oligocene to the early Miocene,Indochina block's sout heastward extrusion slowed down gradually.However,South China block was relatively stable and Yinggehai basin was under a left-slip shearing condition. 　　The third phase,during the middle and the later Miocene,with the Indochina block intruding into Eurasia plate gradually,Indochina peninsula's extrusion slowed down further.At the end of the middle Miocene,South China block began to extru de integrally. 　　The last phase,from the Pliocene to the Quaternary period,Indochina block was relative ly stable,South China block's extrusion continues,the relative movement of the se two blocks is right-slip shearing. 　　The Cenozoic evolution of tectonic stress field of Yinggehai basin is controlled by the interaction between Pacific plate,India plate and Eurasia plate.Most of all,the relative movement between Indochina and South China block resulted from the India-Eurasia collision is the dominate factor of the Cenozoic tectonic stre ss field controlling the origin and evolution of Yinggehai basin.