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苏北平原2.58Ma以来的海陆环境演变历史——宝应钻孔沉积物的常量元素记录
  • ISSN号:1001-7410
  • 期刊名称:《第四纪研究》
  • 时间:0
  • 分类:P531[天文地球—古生物学与地层学;天文地球—地质学] P942[天文地球—自然地理学]
  • 作者机构:[1]南京大学海岸与海岛开发教育部重点实验室,南京 210093, [2]南京大学地球科学系成矿作用研究国家重点实验室和南京大学海洋地球化学研究中心,南京 210093, [3]BRAQ-Stratigraphie,37 Chemin Cochrane,Compton QC,Canada J0B 1L0
  • 相关基金:国家自然科学基金项目(批准号:40271004)资助
中文摘要:

苏北盆地是一个以箕状断陷为特点的复合型沉积盆地.文章根据2004年夏采集的苏北盆地宝应钻孔(BY1)97m沉积物的124个样品11种常量元素SiO2,Al2O3,TiO2,Fe2O3,MgO,MnO,CaO,K2O,Na2O,P2O5和SO2的地球化学特征分析,探讨了海相沉积环境与陆相沉积环境的元素分布特点、成因、相互之间的联系和物质来源.根据沉积物常量元素含量的垂向变化,结合沉积相、岩性特征、有孔虫分析、古地磁及^14C定年,分析了苏北盆地2.58Ma以来不同阶段海陆交互作用下的常量元素变化特点,反映了苏北平原在第四纪曾经历了4次海水淹覆,海-陆交互堆积作用明显,经滨浅海→泻湖→湖泊→洼地,最后由河流冲积物覆盖成陆.

英文摘要:

The Northern Jiangsu Plain along the Yellow Sea is located on the northern side of the Changjiang River and south of the Cape Lan-Shan Tou, 32°10′~35°05′N, and 118°40′~120°30′E. Historical records and previous studies have indicated that the east part of the plain was formed from the sea during a Holocene high sea level period at ca. 5000aB. P. The present study is focused on the west part of the plain which is located landward of the shell beach ridges and to the west of the Grand Canal. The BY1 Borehole was drilled 145m deep at Wangzhigang Town of Baoying County, in the central lowland area of the plain and between the lakes and the outer coastal ridges. 97m of clay and silty core sediments were used to interpret the North Jiangsu Plain's geomorphologic history since 2.58Ma by a muhidisciplinary study of sedimentary facies, microfossils and geochemistry. Major elements of SiO2, Al2O3, TiO2, Fe2O3, MgO, MnO, CaO, K2O, Na2O, P2O5, and SO2 of 124 samples from this core were analyzed. The main results are as follows: ( 1 )The average contents of major elements from BY1 follow the pattern of Si 〉 Al 〉 Fe 〉 Ca 〉 K 〉 Mg 〉 Na 〉 Ti 〉 Mn 〉 P 〉 S, and are characterized by high Si, Ti, Mn, P, S and low Na, Mg, Al, K, Ca, Fe in comparison with those of the upper continental crust in Eastern China. (2) Elements originated from the sea such as Mg, Ca, P, S are higher in marine sediments than those in continental sediments. Marine sediments are also evidenced by large numbers of foraminifera and marine ostracods. (3)For continental sediments from BY1, the average contents of Si and Mn are higher than those in the marine ones, and Al, Fe, Si are between those from the Changjiang River and the Huanghe River sediments, indicating that the detritus from these two rivers have contributed to the formation of the plain. (4) Based on sedimentary facies, microfossils, paleomagnetism, ^14C datings, and major element variations the land-sea interaction history of this part of the

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期刊信息
  • 《第四纪研究》
  • 中国科技核心期刊
  • 主管单位:中国科学院
  • 主办单位:中国科学院地质与地球物理研究所 中国第四纪研究委员会
  • 主编:郭正堂
  • 地址:北京9825信箱
  • 邮编:100029
  • 邮箱:dsj@mail.igcas.ac.cn dsjs@mail.igcas.ac.cn
  • 电话:010-82998119
  • 国际标准刊号:ISSN:1001-7410
  • 国内统一刊号:ISSN:11-2708/P
  • 邮发代号:82-428
  • 获奖情况:
  • 1996年被国务院学位委员会地球物理及地质学科评议...,2001年入中国期刊方阵,2007年获中国科学院出版基金科技期刊排行榜三等奖
  • 国内外数据库收录:
  • 美国化学文摘(网络版),英国动物学记录,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:17826