地学前缘 ›› 2009, Vol. 16 ›› Issue (2): 396-403.

• 论文 • 上一篇    

辽宁沿海早、中期全新世海进中的一次海退事件探讨

  

  1. 1中国地质大学(北京) 海洋学院, 北京 100083
    2天津师范大学 城市与环境科学学院, 天津 300387
    3霍城中学,甘肃 山丹 734100
    4天津市第十九中学, 天津 300020

  • 出版日期:2009-03-02 发布日期:2009-03-02
  • 作者简介:方晶(1963—),男, 博士研究生,工程师,第四纪地质学专业。E-mail: mdfangjing@yahoo.com.cn
  • 基金资助:

    日本笹川研究助成金项目(11393M);国土资源部基金项目(40201052)

Discussion on the marine regression event during the EarlyMiddle Holocene in the Liaoning Coast.

  1. 1School of Marine Sciences, China University of Geosciences(Beijing), Beijing 100083, China
    2College of Urban and Environmental Science, Tianjin Normal University, Tianjin 300387, China
    3Huocheng Middle School,  Shandan  734100, China
    4Tianjin  No.19 Middle School, Tianjin 300020, China

  • Online:2009-03-02 Published:2009-03-02

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摘要：

通过分别对辽东半岛东侧大洋河平原中部的D65孔岩心做连续的硅藻分析,以及对辽东半岛西侧的长兴岛八岔沟古泻湖平原B3孔、下辽河平原的机械钻孔X33及手动钻孔X11和X21等钻孔岩心做连续的粘土混浊水电导率测定,得到各岩心的硅藻图谱/或粘土混浊水电导率图谱。显示出在这些海岸平原均有厚度在6 m以上的海相层存在。表明全新世海侵时海水达到并长期占据这些海岸平原。同时还显示在这些海相地层的5~7 m深处,普遍存在一层陆相或海陆交互相地层,通过对各地点已有的14C年代数据分析,推测这层陆相层或海陆交互相地层应该形成于全新世海面上升的早全新世—中全新世时期。表明全新世海进期当中,辽宁沿海普遍存在一次海退地质事件。从下辽河平原样品的14C测年数据,推测这次海退时期大致在9 300~8 000 a B.P.(校正年)。

关键词: 全新世海侵;硅藻分析;粘土混浊水电导率;海相层;陆相层

Abstract:

We have carried out the diatom analysis of the cores of hand drilling D65 in the central Dayanghe plain of the eastern Liaodong peninsula, and made the successive electric conductivity measurements on the cores of hand drilling B3 of Bachagou in Changxing island in the west of Liaodong peninsula and on the cores of hand drilling X11 and X21 and mechanical drilling X33 in the lowerreach of Liaohe plain. Based on these diatom analysis and conductivity measurements, we obtained the diatom mappings and electric conductivity mappings of the cores, respectively.  It is shown that there are  marine facies layers  over 6 meters in thickness throughout the plain and  indicated that the seawater had reached the coastal plain in the Holocene, and that the transgression of the seawater  had occupied the coast for a long period In addition, it is revealed that there are continental facies or marineterrigenous facies formation  widely deposited beneath the marine facies bed in the depth about 57 meters, which indicates that the widespread marine regression event had occurred during  the transgressive period in the Holocene It can be presumed that they were formed in the time span from the early Holocene to the middle Holocene (9 3008 000 cal. a B.P.) according to the known 14C age dating.

Key words:

Holocene transgression; diatom analysis; electric conductivity; marine facies bed; continental facies bed

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