地质学报2017，Vol.91Issue(2)：287-301,15.
渤海菜州湾晚第四纪底栖有孔虫分布特征及古环境意义
Distribution Characteristics of Benthic Foraminifera of the Late Quaternary in Laizhou Bay, Bohai Sea, China and Its Paleoenvironmental Significance
摘要
Abstract
Based on the quantitative statistical analysis of benthic foraminifera fauna in 255 samples that were taken from three boreholes (GK138,GK111,GK95) of the Laizhou Bay of Bohai Sea,15 genera and 32 species of benthic foraminiferal fossils are identified.Species richness and diversity of benthic foraminifera and age data of AMS14 C and OSL,show three marine sedimentary beds,which can be respectively interpreted as Marine Bed 3(M3) deposited in the Later Mid-Pleistocene phase,Marine Bed 2(M2) in the Late Pleistocene phase and Marine Bed 1(M1) in the Holocene phase in ascending.By the comparison with the global sea-level change curve,M3,M2 and M1 have a good correspondence with the high sea stage of MIS (Marine Isotope Stage) 7,MIS 5 and MIS 1.The analysis results of thickness and elevation of roof and floor in the marine sedimentary beds show that the multi-stage and the different intensity of tectonic activities occurred from Later Mid-Pleistocene to Late Pleistocene,and tectonic activity was relatively weaken in the Holocene.Three microfossil assemblages related to different environments were identified based on multivariate quantitative analyses (mainly Q-mode cluster analysis and principal component analysis):assemblage Ⅲ is characterized by a river mouth-supratidal or paralic environment or a relatively small scale of Later Mid-Pleistocene transgression,assemblage Ⅱ was the product of the Late Pleistocene transgression and indicates a intertidal-subtidal environment,and assemblage Ⅰ is characterized by the supratidal-intertidal environment,which mainly occurred during Holocene marine transgression.关键词
莱州湾/晚第四纪/底栖有孔虫/海相地层/古环境意义Key words
Laizhou Bay/Late Quaternary/Benthic foraminifera/Marine sedimentary beds/palaeoenvironment significance引用本文复制引用
李守军,崔肖辉,徐华,张卓,赵秀丽,高宗军,刘强,刘晓..渤海菜州湾晚第四纪底栖有孔虫分布特征及古环境意义[J].地质学报,2017,91(2):287-301,15.基金项目
本文为中国地质调查局“山东半岛蓝色经济区地质环境调查评价”项目(编号1212011220001)和山东科技大学研究生科技创新基金项目(编号YC150320)共同资助. （编号1212011220001）
