高级检索
    张晓飞, 张学斌, 张永义, 牛树银, 孙爱群, 王永立, 樊航宇, 李明辰, 韩荣文. 渤海湾西北部晚更新世(113.96 ka)以来的沉积环境及对海侵和构造运动的指示[J]. 中国地质. DOI: 10.12029/gc20221207001
    引用本文: 张晓飞, 张学斌, 张永义, 牛树银, 孙爱群, 王永立, 樊航宇, 李明辰, 韩荣文. 渤海湾西北部晚更新世(113.96 ka)以来的沉积环境及对海侵和构造运动的指示[J]. 中国地质. DOI: 10.12029/gc20221207001
    ZHANG Xiaofei, ZHANG Xuebin, ZHANG Yongyi, Niu Shuyin, Sun Aiqun, WANG Yongli, FAN Hangyu, LI Mingchen, HAN Rongwen. Depositional environment since Late Pleistocene (113.96 ka) in the northwestern Bohai Bay and its indications to transgression and tectogenesis[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20221207001
    Citation: ZHANG Xiaofei, ZHANG Xuebin, ZHANG Yongyi, Niu Shuyin, Sun Aiqun, WANG Yongli, FAN Hangyu, LI Mingchen, HAN Rongwen. Depositional environment since Late Pleistocene (113.96 ka) in the northwestern Bohai Bay and its indications to transgression and tectogenesis[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20221207001

    渤海湾西北部晚更新世(113.96 ka)以来的沉积环境及对海侵和构造运动的指示

    Depositional environment since Late Pleistocene (113.96 ka) in the northwestern Bohai Bay and its indications to transgression and tectogenesis

    • 摘要:研究目的】渤海湾西北部是华北平原沉积环境变化较为频繁的地区,也是新构造运动的主要沉降区,加强渤海湾西北部晚更新世以来的地层研究,分析沉积环境演变过程,对研究海岸带地区海平面变化及沉降作用具有重要意义。【研究方法】以渤海湾西北岸地区QLT03孔、QEJ01孔和NHG14孔三个全取心钻孔为基础,综合岩石地层和生物地层的方法,采用AMS14C和光释光测年技术,对比分析了邻区收集钻孔,探讨了研究区晚第四纪以来的沉积环境及对海侵和构造运动的指示作用。【研究结果】结果表明,研究区晚更新世早期为三角洲平原和河湖相发育期,中期以漫滩湖泊相和三角洲平原发育为主,晚期为曲流河-河漫滩相发育期,全新世为三角洲平原-洪泛平原发育期。研究区自下向上发育三期海侵地层,分别是晚更新世早期的第三海侵层、晚更新世晚期的第二海侵层和全新世的第一海侵层,海侵规模由古至今呈现逐渐加强的趋势,各期海侵层与全球海平面变化较一致,并自下而上分别与MIS5、MIS3和MIS1阶段的高海面有良好的对应关系。研究区自晚更新世以来存在差异性沉降运动,且在全新世差异性运动变缓。【结论】在持续的构造沉降背景下,渤海湾沿岸地区大规模海侵均发生在晚更新世以来,这些期次海侵与渤海湾沿岸天津东南部地区长期下沉过程相关,且沉降中心自宝坻八门城镇向汉沽茶淀镇方向移动,进入全新世以后构造活动减弱,差异性沉降运动不明显。渤海湾沿岸地区晚第四纪地层发育和沉积环境演化受到海平面变化的控制。

       

      Abstract: This paper is the result of maring geological survey engineering. Objective The northwest of Bohai Bay is an area where the depositional environment changes frequently in North China Plain and is also the main depressed area of the neotectonics. Strengthening the stratigraphic research since Late Pleistocene in Northwestern Bohai Bay and analyzing the evolution process of the depositional environment is of great significance to the study of sea-level change and subsidence of coastal areas.MethodBased on the three full coring boreholes QLT03, QEJ01 and NHG14 in the northwest coast of Bohai Bay, and by integrating the lithostratigraphic and biostratigraphic methods, AMS14C and optical stimulated luminescence dating are used to compare and analyze the collection boreholes in the adjacent area, discussing the depositional environment and its indications to transgression and tectogenesissince late Quaternary in the study area.ResultThe results show that early Late Pleistocene of the study area is the development period of delta plain and fluvio-lacustrine facies, the middle is the development period of floodplain-lacustrine facies and delta plain, the late is the development period of meandering stream- floodplain facies, and Holocene is the development period of delta plain- flood plain. The study area develops three phases of transgressive strata from bottom to top, namely, the third transgressive layer in early Late Pleistocene, the second transgressive layer in late Late Pleistocene and the first transgressive layer in Holocene. The scale of transgression has gradually strengthened from the ancient to the present. The transgressive layers in each phase are more consistent with the global sea level change and have good correspondence with the high sea level in MIS5, MIS3 and MIS1 phases from bottom to top. There has been differential subsidence movement in the study area since Late Pleistocene, and the differential movement has slowed down in Holocene.Conclusion Under the background of continuous tectonic subsidence, large-scale marine transgressions in the coastal area of Bohai Bay have all occurred since Late Pleistocene. These transgressions are related to the long-term subsidence process in the southeastern area of Tianjin along the coast of Bohai Bay, and the subsidence center moved from Bamencheng Town of Baodi District to Chadian Town of Hangu District. After entering Holocene, the tectonic activity weakened and the differential subsidence movement was not obvious. The late Quaternary stratigraphic development and depositional environment evolution in the coastal areas of Bohai Bay are controlled by sea level changes.

       

    /

    返回文章
    返回