中山大学学报（自然科学版）Issue(6)：45-52,8.
珠江三角洲东部晚第四纪微体动物群的古环境意义
Palaeoenvironmental Significance of Late Quaternary Microfaunas in the Eastern Pearl River Delta
摘要
Abstract
The Pearl River Delta,formed since the Late Pleistocene,is one of the major delta in the world .There are abundant microfaunas preserved in sediments of the Pearl River Delta,which have been proved to be essential for reconstructing Quaternary environment.In this study,Microfaunas (foramini-fers and ostracods)of borehole PRD17 from the eastern Pearl River Delta have been analyzed quantita-tively.A total of 29 foraminiferal species belonging to 14 genera and 17 ostracod species referred to 14 genera were identified.They can be divided into three different groups with respect to their ecological ranges.Based on the comprehensive analysis of microfaunas,lithological and sediment grainsize charac-teristics of core samples,palaeoenvironmental changes since the Late Pleistocene can be reconstructed. Before ~43 400 cal a B.P.,a fluvial environment was recorded in the borehole until the late Wurm In-terglacial Stage when the first Quaternary marine unit began to lie down.During this transgressive inter-val,three short-term environmental fluctuations of water depth can be recognized base on microfaunal da-ta.A peak transgression of the Late Pleistocene was marked between ~35 400 and 30 900 cal a B.P.. Since about 25 900 cal a B.P.,sea waters gradually retreated from the study area and the Upper Pleis-tocene sediments were subsequently subaerially exposed during the Last Glaciation Maximum,which is indicated by a mottled clay layer in the core.Around ~6 000 cal a B.P.,the postglacial sea level rise initiated a new phase of the Holocene sedimentation.This timing was later than in other parts of the Pearl River Delta because core site is located in the Guangzhou-Panyu fault block with a higher elevation during the Early-Middle Holocene.A supralittoral-zone environment developed during the first phase of Hol-ocene sedimentation.Since ~3 700 cal a B.P.,the study area gradually changed into a tide flat envi-ronment with microfossils sporadically present.关键词
珠江三角洲/有孔虫/介形类/晚第四纪/古环境Key words
the Pearl River Delta/foraminifers/ostracods/Late Quaternary/palaeoenvionment分类
生物学引用本文复制引用
吴洁,刘春莲,张素青,杨婷婷,殷鉴..珠江三角洲东部晚第四纪微体动物群的古环境意义[J].中山大学学报（自然科学版）,2014,(6):45-52,8.基金项目
国家自然科学基金资助项目（40872024）；德国学术交流中心（DAAD）与国家留学基金委（CSC）国际合作交流资助项目 （）
