摘要
根据微体化石、粒度、孢粉、粘土矿物和碳酸钙含量等多项分析资料，以及古地磁、１４Ｃ和ＥＳＲ等项测年资料，划分出７个海相地层，它们是：中更新世中、晚期的Ｈ７（４１７．０～４６０．０ｋａＢ．Ｐ．）和Ｈ６（１５７．５～２３１．３ｋａＢ．Ｐ．）海相层；晚更新世前半期末次间冰期的Ｈ５（１００．６～１２４．３ｋａＢ．Ｐ．）和Ｈ４（７６．５～８７．６ｋａＢ．Ｐ．）海相层，末次冰期里两间冰阶的Ｈ３（５８．２～６７．４ｋａＢ．Ｐ．）和Ｈ２（２８～３６ｋａＢ．Ｐ．）海相层，以及冰后期的Ｈ１（８．５ｋａＢ．Ｐ．以来）海相层。其中Ｈ７为渤海海底最新确定的年代最老的海相层。以Ｓ３孔为主，与渤海中部的ＢＣ－１孔和西部的辛集孔对比。
S 3 hole lies at the northeastern margin of the modern Yellow River Delta and extends to the south of the Bohai Sea.Its depth is 450 27m,and the buried depth of 174m is the lower boundary of Middle Pleistocene.We can identify seven marine beds according to some analytical data of microfossils,granularity,sporopollen,clay mineral and content of calcium carbonate and dating data such as paleomagnetism, 14 C and ESR.They are marine bed H 7(with buried depth of 154～158m,417 0～460 0kaBP) and H 6(with buried depth of 107 4～131 0m,157 5～231 0kaBP) which were formed in middle and late Middle Pleistocene,H 5(with buried depth of 86～95 85m,100 6～124 3kaBP) and H 4(with buried depth of 73～79m,76 5～87 6kaBP)which were formed in the last interglacial period,H 3(with buried depth of 64～69m,58 2～67 4kaBP) and H 2(with buried depth of 43～52m,28～36kaBP)which were formed in two interstades of the last glacial period and H 1(with buried depth of 0～23m,8 5kaBP to now)which was formed in postglacial period.Of all of these beds,H 7 is identified recently as the oldest one in the Bohai Sea bottom.According to S 3 hole mostly,and contrasting with B C 1 hole which lies in the middle of the Bohai Sea and Xinji hole which lies in the west of the Bohai Sea,we illuminated the evolutionary history of transgression regressional environment in Late Quaternary period of the Bohai Sea.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1999年第2期27-35,共9页
Marine Geology & Quaternary Geology
基金
国家自然科学基金
关键词
海相地层
环境演变
晚第四纪
渤海南部
marine beds environmental evolution Late Quaternary in the south of the Bohai Sea
