第43卷第6期 2016年12月
doi: 10.12029/gc20160613
中
国地
质
GEOLOGY IN CHINA
缪卫东，李世杰，冯金期，等.长江三角洲NB5孔第四纪地层划分及环境变化信息[].中国地质，2016,43(6):2022-2035.
Vol.43, No.6 Dec.,2016
s environmental change
Miao Weidong, Li Shijie, Fen Jinshun, et al. Stratigraphic division of NB5 core in the Yangtze delta area and its information[J]. Geology in China, 2016, 43(6): 20222035(in Chinese with English abstract)
长江三角洲NB5孔第四纪地层划分及环境变化信息
缪卫东李世杰2冯金顺·高立·鄂建
(1江苏省地质调查研究院江苏南京210049,2.中科院地球化学研究所，资州资阳550002）
提要：长江三角洲北翼NB5孔做了古地磁测试、"C测试及ESR测试结果，对古地磁变化特征进行了总结分析，结合区内其他钻孔的对比，对钻孔第四纪地层划分及所反映的古气候环境进行了探讨。结果表明：46m处为全新世底界，163m为申更新世项部，240m左右为早更新世项部，354m为早更新世底部。其申，海相层有2个，位置在2~47 m，125-163m。分别对应于I(Qh)镇江海侵，Ⅲ(Q,")昆山海侵。据晚更新世以后沉积物粒度变粗及磁化率所反映的巨大变化特征，提出中更新世晚期、晚更新世初期为长江主泓流经本区的时间，并认为此或与塑造中国现代地貌的共和运动造成的青藏高原再次强烈隆升有关。
键词：长江三角洲；NB5孔；古地磁；第四纪地层划分；环境变化关
中图分类号：P534.63
文献标志码：A
文章编号：1000-3657(2016)06-2022-14
StratigraphicdivisionofNB5coreintheYangtzedeltaareaandits
environmentalchangeinformation
MIAO Wei-dong', LI Shijie", FEN Jin-shun', GAO Li', E Jian
(1. Geological Survey of Jiangsu Province, Nan/ing 210049, Jiangsu, Chind; 2. Institute of Geochemistry Chinese Academy of
Sciences, Guiyng 550002, Guizhou, China)
Abstraet: Located in the west beach of Pacific Ocean and the mouth area of Yangtze River, the Yangtze delta area is doubly affected by the sea and the regional big river. Therefore, the sedimentary environment is very complex. The NB5 hole is in the north of Yangtze delta area. The NB5 hole at Xiting Town of Nantong City was drilled 362 m deep with 354m thickness of Quaternary strata According to testing results of paleomagnetism, "C and ESR of NB5 core, analyzing the lithological character, and a comparison with other cores in this area or nearby areas, the strata were divided and the environment evolution since the Quatemary was investigated. The result indicates that the bottom of Holocence is at about 46 m, the top of middle Pleistocene is at about 163 m, thc top of lower Pleistocene is at about 240 m, and the bottom of lower Pleistocene is at about 354 m. There are five marine face layers in the core which are located 247m and 125 163 m. they are the 1 transgression layer (Zhenjiang transgression) and the 3 transgression layer (Kunshan transgression), because there exist remarkable different lithological characteristics and magnetic
收稿日期：20150818；改回日期：20151203
基金项目：中国地质调查局项目（GZH201200506)资助。
作者简介：缪卫东，男，1967年生，博士，研究员级高级工程师，主要研究方向为环境地质及第四纪地质；E-mail:mwd118@163.com。
http:/geochina.cgs.gov.cn 中国地质, 2016, 43(6)