吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (2): 499-517.doi: 10.13278/j.cnki.jjuese.201602116

• 地质与资源 • 上一篇    下一篇

渤海湾西岸现代岸线钻孔记录的全新世沉积环境与相对海面变化

陈永胜1,2, 李建芬1,2, 王福1,2, 田立柱1,2, 商志文1,2, 施佩歆1,2, 姜兴钰1,2, 王宏1,2   

  1. 1. 中国地质调查局天津地质调查中心, 天津 300170;
    2. 中国地质调查局泥质海岸带地质环境重点实验室, 天津 300170
  • 收稿日期:2015-05-16 发布日期:2016-03-26
  • 作者简介:陈永胜(1975-),女,博士,助理研究员,主要从事第四纪海岸带地质环境变化研究,E-mail:cyongsheng@cgs.cn
  • 基金资助:

    国家自然科学基金项目(41372173,41476074);中国地质调查局项目(1212011120169,12120113005800)

Records of Holocene Sedimentation Environment and Relative Sea Level by the Boreholes Collected Along the Present Shoreline of the West Coast of Bohai Bay, China

Chen Yongsheng1,2, Li Jianfen1,2, Wang Fu1,2, Tian Lizhu1,2, Shang Zhiwen1,2, Shi Peixin1,2, Jiang Xingyu1,2, Wang Hong1,2   

  1. 1. Tianjin Centre, China Geological Survey, Tianjin 300170, China;
    2. Key Laboratory of Muddy Coast Geo-Environment, China Geological Survey, Tianjin 300170, China
  • Received:2015-05-16 Published:2016-03-26
  • Supported by:

    Supported by National Natural Science Foundation of China (41372173,41476074) and China Geological Survey (1212011120169,12120113005800)

摘要:

以渤海湾西岸现代岸线附近的NP3、CH110和BT113三个钻孔全新世岩心为研究对象,采用沉积岩石学、AMS 14C(accelerator mass spectrometry 14C,加速器质谱14C)测年、微体生物聚类分析等方法精细判别沉积相,重建渤海湾西岸全新世沉积演化历史,并利用微体生物组合分带对水深变化的指示,定量讨论全新世相对海面变化。结果表明:渤海湾西岸全新世受海陆交互作用影响,经历了沼泽-潮滩-浅海-前三角洲-三角洲前缘-三角洲平原环境的演化过程。全新世初始阶段,研究区中部和北部发育沼泽环境,南部未见沉积,与上更新统河流相沉积呈不整合接触。全新世早期,研究区潮滩环境发育。潮滩层厚度约1 m,历时数百至1千余年。至7000 cal BP前后水深增大,研究区进入浅海环境。约6000 cal BP,沿岸南北两端先后进入三角洲过渡环境,中部三角洲环境约开始于1500 cal BP。渤海湾西岸地区全新世的环境演化同时记录了该地区的相对海面变化:约10000 cal BP前后,渤海湾相对海平面已接近21.3~20.4 m。约8000 cal BP,相对海平面介于18.6~17.0 m。约6000 cal BP时相对海平面低于6.8 m,5000~1000 cal BP,相对海平面高于-2.5 m,1000~800 cal BP,相对海平面介于-1.3~-0.4 m。8000~5000 cal BP时,相对海面上升约15.0 m,上升速率达5 m/1 ka。

关键词: 渤海湾西岸现代岸线, 全新世, 沉积环境, 相对海面

Abstract:

The three boreholes (NP3, CH110, and BT113) distribute from north to south along the west coast of Bohai bay. Through sampling the materials of the upper beds of the three cores deposited during Holocene, the authors analyze lithology, ages of AMS 14C, the assemblages of benthic foraminifera, and ostracoda to rebuild the Holocene sedimentation environment, and discuss the relative sea level changes quantificational. The results indicate that influenced by land-ocean interaction, the study area went through various stages of environmental development from swamp, tidal flat, shallow sea, prodelta, delta front to delta plain. At the beginning of Holocene, swamps developed in the mid to north parts of the study area; the south part, however, was exposed without deposition and unconformable contact with the underlying fluvial sediment deposited during Late Pleistocene. In Early Holocene, tidal flat developed overall with about 1m sediment only which took about several hundred years to more than a thousand years. Around 7000 cal BP, the sedimentation environment was transformed into shallow sea followed increasing water depth in Mid-Holocene, and at 6000 cal BP, changed into delta regime at north and south ends along the present shoreline. But, at mid of shoreline, delta regime began at 1500 cal BP. The environmental change in the west coast of Bohai bay reflects the relative sea level change in Holocene. At the beginning of Holocene, the relative sea level rose close to 21.3-20.4 m. At ca.8000 cal BP, the relative sea level was 18.6-17.0 m, and below 6.8 m at ca.6000 cal BP. At ca.5000-1000 cal BP, the relative sea level was above 2.5 m. It was between 1.3 m to 0.4 m during 1000-800 cal BP. During the period of 8000-5000 cal BP, the sea level rose about 15.0 m with a faster rate of 5 m/1 ka.

Key words: present shoreline of the west coast of Bohai bay, Holocene, sedimentation environment, relative sea level

中图分类号: 

  • P

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