南京大学学报(自然科学版) ›› 2022, Vol. 58 ›› Issue (2): 246–254.doi: 10.13232/j.cnki.jnju.2022.02.008

• • 上一篇    

距今1600年来南通如东国清寺遗址地层微体古生物记录的海岸带变化特征

朱诚1, 田晓四2(), 姚志强2, 郭天虹1, 贺云翱3   

  1. 1.南京大学地理与海洋科学学院，南京, 210023
    2.池州学院地理与规划学院，池州, 247000
    3.南京大学历史学院，南京, 210023
  • 收稿日期:2021-12-21 出版日期:2022-03-30 发布日期:2022-04-02
  • 通讯作者: 田晓四 E-mail:846704366@qq.com
  • 作者简介:E⁃mail：846704366@qq.com
  • 基金资助:
    国家自然科学基金(41571179)

Characteristics of the coastal zone changes recorded by micropaleontology in the Rudong Guoqing Temple site,Nantong during the past 1600 years

Cheng Zhu1, Xiaosi Tian2(), Zhiqiang Yao2, Tianhong Guo1, Yun'ao He3   

  1. 1.School of Geography and Marine Sciences, Nanjing University, Nanjing, 210023, China
    2.School of Geography and Urban Rural Planning, Chizhou University, Chizhou, 247000, China
    3.School of History, Nanjing University, Nanjing, 210023, China
  • Received:2021-12-21 Online:2022-03-30 Published:2022-04-02
  • Contact: Xiaosi Tian E-mail:846704366@qq.com

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摘要：

对如东国清寺遗址地层微体古生物的鉴定发现，该剖面的底栖有孔虫大致可以划分出半咸水、广盐滨岸和盐度要求较高（多盐?真盐）的近岸浅海属种等三类，再加上浮游有孔虫共计可分为四大类.其中半咸水类在我国东、黄海沿岸主要见于盐度低于20‰的潮上带、潮间带和河口等少盐至中盐的半咸水环境.广盐类是我国东海和黄海沿岸广布的底栖有孔虫，广见于潮上带、潮间带、潮下带、潟湖和河口的少盐（1‰~5‰）至真盐（30‰~35‰）内陆架海水中.近岸浅海类在现代主要分布于水深小于100 m的内?中陆架和河口地区的前三角洲正常盐度的海水中.自110 cm以后，直至5 cm，发现较多的陆相介形虫：Ilyocypris bradyi，Candoniella albicans，Candona sp..这是首次在全新世海侵的末期发现如此多的陆相介形虫.这一发现表明当时本区有淡水流入，也表明海湾相从此进入消亡期，由海湾相逐渐变成淡水湖泊相，海水慢慢地退出本区.分析了遗址剖面有孔虫和介形虫剖面数量变化特征，重建了当地海岸线在全新世海侵末期后的变化规律，对深入认识我国东部海岸线在历史时期的变化过程和与人类活动的关系具有一定的参考价值.

关键词: 如东国清寺, 遗址地层, 微体古生物记录, 海岸带变化特征

Abstract:

It was found that the Benthic Foraminifera in the section can be divided into three types,I. E. Brackish Water,broad?salt riparian and coastal shallow sea with higher salinity (polyhaline?euhaline),together with planktonic Foraminifera,there are four main groups. The brackish water is mainly found in the subtidal zone,intertidal zone and estuaries where salinity is less than 20‰ . Guangyan is a kind of Benthic foraminifera widely distributed along the coast of the East China Sea and the Yellow Sea. It is widely found in the inner shelf water from little salt (1‰~5‰) to true salt (30‰~35‰) in the waters of the continental shelf,intertidal zone,subtidal zone,lagoons and estuaries. In modern times,the nearshore and shallow sea species are mainly distributed in the inner?middle shelf with water depth less than 100 m and in the normal salinity of the Pre?delta in the estuarine area. From 110 cm to 5 cm,more terrestrial ostracods were found: Ilyocypris Bradyi,Candoniella Albicans,and Candona sp.. This was the first time that so many terrestrial ostracods were found at the end of the Holocene transgression. This finding indicates that fresh water was flowing into the area at that time,and that the bay facies entered the extinction period from the bay facies gradually into the freshwater lake facies,and the sea water slowly withdrew from the area. Number variation characteristics of foraminifera and ostracodes in the profile of the site are analyzed,and the change law of local coastline after the end of Holocene transgression is reconstructed,It has a certain reference value for further understanding the relationship between the changing process of the eastern coastline of China and human activities the change process of China's eastern coastline in the historical period.

Key words: Guoqingsi, Rudong, site stratigraphy, micropaleontological record, coastal zone change characteristics

中图分类号: 

  • K903

图1

南通如东国清寺遗址位置图"

图2

南通如东国清寺遗址地层图"

表1

如东国清寺遗址地层光释光样品测年数据"

实验室

编号

样品编号

深度

(cm)

含水量

(%)

U

(1×10-6)

Th

(1×10-6)

K(%)

等效剂量

(Gy)

实际

样品数

石英剂量率

(Gy·ka-1)

石英年代

(ka)

NJU2964RD18?2,7?1,7?2019.71.99±0.1011.99±0.601.69±0.030.95±0.03122.70±0.180.33±0.02
NJU2963RD18?2,5?1,5?210029.22.03±0.1012.10±0.611.51±0.033.58±0.09122.36±0.141.49±0.10
NJU2961RD18?2,3?1,3?220024.41.99±0.1012.16±0.611.68±0.033.47±0.0872.60±0.161.34±0.09
NJU2959RD18?2,2?1,2?225020.82.14±0.1111.70±0.581.72±0.033.69±0.1582.74±0.171.37±0.11
NJU2962

RD18?1,24?0cm,

5?1,5?2

33034.31.83±0.0910.39±0.521.61±0.033.28±0.09102.22±0.131.49±0.10
NJU2960

RD18?1,72?48cm,

3?1,3?2

40233.82.18±0.1012.06±0.601.42±0.033.63±0.0772.23±0.131.66±0.11
NJU2958

RD18?1,120?90cm,

1?1,1?2

45035.12.16±0.1113.32±0.671.93±0.044.03±0.1482.77±0.151.53±0.11

表2

南通如东国清寺遗址地层有孔虫样品送样单"

编号深度（cm）编号深度（cm）编号深度（cm）
RD?01450~445RD?31300~295RD?61150~145
RD?03440~435RD?33290~285RD?63140~135
RD?05430~425RD?35280~275RD?65130~125
RD?07420~415RD?37260~265RD?67120~115
RD?09410~405RD?39260~255RD?69110~105
RD?11400~395RD?41250~245RD?71100~95
RD?13390~385RD?43240~235RD?7390~85
RD?15380~375RD?45230~225RD?7580~75
RD?17370~365RD?47220~215RD?7770~65
RD?19360~355RD?49210~205RD?7960~55
RD?21350~345RD?51200~195RD?8150~45
RD?23340~335RD?53190~185RD?8340~35
RD?25330~325RD?55180~175RD?8530~25
RD?27320~315RD?57170~165RD?8720~15
RD?29310~305RD?59160~155RD?8910~5

图3

剖面有孔虫和介形虫剖面数量变化特征"

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