Quaternary Tectonic Activity near the Qianliyan Island of Southern Yellow Sea
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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.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.
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Key words:
- southern Yellow Sea /
- Qianliyan Island /
- Quaternary /
- tectonic activity /
- tectogenesis /
- seismic profile
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图 1 研究区位置、范围与测线分布
图中实线为地震测线位置，测线加粗部分为文中引用剖面的位置；虚线为等深线，间隔5m；b图为研究区所处大地构造位置，其中自钻孔QC2至研究区的一系列相交直线为地震剖面追踪测线，①代表千里岩断裂，②代表嘉山-响水断裂带；单位：m
Fig. 1. Location map showing seismic profiles
图 2 地震地层划分与时代(测线IV)
Fig. 2. Seismic stratigraphic units and their period along line IV
图 3 测线VII上发育的断裂与褶皱(剖面A-A'，图b为解释剖面)
Fig. 3. Seismic profile (a) A-A' with interpretation (b) showing faults and folds in line VII
图 4 测线III上发育的断裂与褶皱(剖面B-B'，图b为解释剖面)
Fig. 4. Seismic profile (a) B-B' with interpretation (b) showing faults and folds in line III
图 5 剖面C-C'上揭示的千里岩断裂及其解释(测线II)
Fig. 5. Seismic profile (a) C-C' with interpretation (b) showing Qianliyan Fault in line II
图 6 剖面D-D'上揭示的千里岩断裂及其解释(测线I)
Fig. 6. Seismic profile (a) D-D' with interpretation (b) showing Qianliyan Fault in line I
图 7 研究区及周边地质构造与地震震中分布
研究区内粗实线AI、AII和“╋”分别指示王志才等(2008)中千里岩附近浅剖测线I、II和所识别的千里岩断裂断点的位置。“☆”则指示本文识别的千里岩断裂断点的位置.地震资料来自顾功叙(1983)和国家地震科学数据共享中心，包括现代地震和历史地震记录.①代表嘉山―响水断裂带；②代表千里岩断裂；③代表蓬莱-威海断裂带；④代表牟平-即墨断裂带；⑤代表蓬莱-栖霞断裂带
Fig. 7. Sketch tectonic map of the study area and its vicinity
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