南黄海太阳沙西侧海域晚第四系地震层序和沉积环境演变

发布时间：2018-04-18 06:44

本文选题：地震层序 + 晚第四系　；参考：《海洋学研究》2017年02期

【摘要】：在南黄海太阳沙西侧潮流脊槽海域进行了密集网格的高分辨率浅地震勘探,测线间距主要为120m和200m。沉积物穿透厚度最大约80~90m,划分为2个地震层序(SQ1和SQ2),细分为5个亚层(U1~U5)。位于下部的层序1(U1)为晚更新世陆相沉积,上部的层序2(U2~U5)以全新世海相沉积为主。根据地震相特征研究了各亚层的沉积环境,从晚更新世晚期以来,研究区经历了三角洲辫状河流—河流刻蚀—古河道充填—河口滨海—三角洲滨浅海—现代潮流脊槽的沉积环境演变过程。在早全新世中期,研究区发育了一条窄河口型潮流沙脊,并随海平面的快速上升而被掩埋。现代潮流沙脊形成于末次高海面后,与古潮流沙脊没有继承关系,与晚更新世古地形也没有关系,受控于潮流系统。
[Abstract]:The high resolution shallow seismic exploration dense mesh in the Southern Yellow Sea sand sun on the west side of the tidal ridge trough area, the line spacing is mainly 120m and 200m. sediment penetration thickness of about 80~90m, divided into 2 seismic sequences (SQ1 and SQ2), divided into 5 sub layers (U1~U5). Located in the lower part of the sequence (1 U1) for late Pleistocene continental sedimentary sequence, the upper part of the 2 (U2~U5) to Holocene marine deposits. According to the study of sedimentary environment of each sub layer from seismic facies, since late Pleistocene, the study area has experienced the depositional environment of Braided River Delta and river ancient channel filling - etching - Coastal triangle delta littoral - modern tidal ridge trough evolution. In the early mid Holocene, the study area developed a narrow estuary tidal sand ridge, and with the rapid rising of the sea level and was buried. Modern tidal sand ridges formed in the last high sea level, and the ancient tide There is no inheritance relationship between the ridges of the quicksand ridges and no relation to the late Pleistocene paleo terrain, controlled by the tidal system.

【作者单位】：上海东海海洋工程勘察设计研究院;国家海洋局东海信息中心;上海扬玺海洋工程技术有限公司;
【基金】：国家海洋公益性行业科研专项项目资助(201315026)
【分类号】：P631.4;P736.2

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