The evolution of sedimentary environment since late Pleistocene in Laizhou Bay, Bohai Sea
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摘要:
晚更新世以来渤海南部莱州湾发生了3次重要海侵-海退事件及沉积演化过程,渤海南部多源河流三角洲对莱州湾沉积环境改变作用明显。本文选择莱州湾剖面进行沉积地层对比,结合调查资料和测试数据,初步建立莱州湾沉积地层格架,分析晚更新世以来莱州湾沉积演化过程。研究发现,渤海南部中小河流与黄河泥沙为莱州湾沉积物的共同物质来源,二者在不同阶段分别对莱州湾沉积演化起主导作用。提出本区沉积地层具有分期性、分段性和相关性规律。在124.6~72.0 ka B.P.,60.0~24.4 ka B.P.和10.2~4.0 ka B.P.出现过3次暖湿期,分别对应沧州海侵、献县海侵和黄骅海侵,主要发育滨浅海相沉积,向南退积为三角洲/潮坪—河流沉积;由陆向海,短源河流沉积贡献降低,黄河沉积贡献增加。在72.0~60.0 ka B.P.和24.4~10.2 ka B.P.出现2次冷干期,分别对应玉木早冰期和玉木晚冰期,河流相发育,三角洲进积。受海陆交互作用影响,晚更新世以来渤海南部莱州湾大致经历了浅海相—三角洲—潮坪—浅海相—三角洲—陆相的沉积演化。
Abstract:There have existed three transgression-regression events and sedimentary evolution processes by sea level changes since late Pleistocene in the southern coast of Laizhou Bay, Bohai Sea. It is obvious that a multi-source fluvial delta sedimentary system may be more dominant for the sedimentary environment. Based on previous researchers' survey and collected data, the authors carried out research work such as division of sedimentary units, sedimentary facies analysis and stratigraphic division and correlation, with the purpose of establishing sedimentary stratigraphic framework of the Laizhou Bay. Besides, the authors focused on analyzing the sedimentary processes of the Laizhou Bay since Late Pleistocene. It is concluded that the main provenance of borehole 07 is Bailang River and the Yellow River, which have played an important role in the multi-source fluvial delta sedimentary system of the southern coast of Laizhou Bay since Late Pleistocene. The evolution can be divided into two glacial periods and three interglacial periods, corresponding to three transgression events and two regression events in Laizhou Bay since late Pleistocene. By geochemistry and provenance analysis, sediments have the characteristics of generation, segment and correlation. In 124.6-72.0 ka B.P., 60.0-24.4 ka B.P. and 10.2-4.0 ka B.P., there occurred three warm-wet periods, respectively corresponding to Cangzhou transgression, Xianxian transgression, and Huanghua transgression; In 72.0-60.0 ka B.P. and 24.4-10.2 ka B.P., which were two dry and cold periods, there was a continental sedimentary environment, corresponding to Wurm early glacier age and Wurm late glacial age. During the transgression period, there always developed littoral-neritic facies in marine area, which was gradually transitional to delta and fluvial facies in the land field, with sediments showing retrogradation superposition pattern. Contribution of short runoff rivers (Bailang river) was reduced gradually from land to sea. During the regression period, fluvial and delta facies were formed in most areas of Laizhou Bay. Terrigenous input of short runoff rivers increased, with sediments showing progradational sequences. From late Pleistocene to Holocene, the region went through sedimentary evolution of neritic facies-delta-continental facies-tidal flat-neritic facies-delta-continental facies.
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Key words:
- Laizhou Bay /
- late Pleistocene /
- transgression/regression /
- sedimentary evolution
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图 4 莱州湾主要海侵线、地下卤水分布及PI平衡线图(据高茂生等,2015修改)
Figure 4.
表 1 莱州湾WFZK07孔沉积物物源指数(PI)比较
Table 1. Comparison of provenance indexes (PI) of sediments in Core 07
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