【摘要】 南黄海千里岩附近海域是千里岩隆起区地震活动较强烈的区域,对该区域新近获得的单道地震剖面的分析表明,海底第四纪沉积层中发育较多的褶皱和断层构造,断层以逆断层为主,褶皱则主要为平缓斜歪褶皱,为断层活动引起.褶皱和断层构造多形成于中更新世以前,千里岩断裂等部分断层最新活动至晚更新世,且具有生长断层的特征,反映了区域较强的活动性.研究区新近纪-中更新世的构造变形可能与南黄海最新一期构造运动有关,是区域构造应力场变化的产物.更多还原

【Abstract】 Many Quaternary folds and faults are identified on the seismic reflection profiles acquired in the adjacent areas of Qianliyan Island of southern Yellow Sea.The faults are mainly of reverse fault.The folds are mainly gentle and tilted,caused by fault activities.Most folds and faults occurred below a plane of unconformity between middle Pleistocene and its overlying upper Pleistocene.Some faults,such as Qianliyan fault,are late Pleistocene active fault.Many faults and folds were synsedimentarily developed in the lower Pleistocene and underlying strata,revealling rather strong tectonic activity,especially at the basin boundary where the faults even cut into the late Pleistocene stratum.The formation of folds and faults was attributed to the last tectogenesis of the Yellow Sea in middle Pleistocene,which maybe correspond to the Kunlun-Huanghe movement of Qinghai-Tibet plateau.At that time,the N-S striking horizontal stress drove the early-developed basin boundary faults reactive and further induced the NEE or E-W striking tectonic deformation in the overlying sedimentary layer.更多还原