中文摘要：

对珠江三角洲中部中山市东升镇附近PRD11孔的岩性和软体动物的分布特征进行分析,并与邻近的PRD10孔以及珠三角其他位置的钻孔记录比较。结果表明：受海平面变化、河流作用和构造升降影响,研究区晚第四纪经历了5个环境阶段：1）约9 010 cal.a B.P.以前,钻孔所在地暴露地表,沉积物遭受风化剥蚀,形成杂色黏土;2）9 010―7 000 cal.a B.P.为全新世大海侵时期,研究区开始发育河口湾环境;3）7 000―5 460 cal.a B.P.,研究区水深短暂下降;4）5 460―3 340 cal.a B.P.水深有所加大,并在约4 546 cal.a B.P.时达到全孔最大水深;5）约3 340 cal.a B.P.以来海水逐渐退出研究区,河流作用增强,研究区逐渐演变为上三角洲平原环境。

英文摘要：

A study has been carried out on the sediments and molluscs of core PRD11 drilled in the central Pearl River Delta plain. The results suggest that the sea level fluctuations, fluvial processes, and tectonic uplift and subsidence led to the environmental changes of the study area during the Holocene. Five environmental stages can be recognized： 1） Before 9 010 cal. a B.P., the sediments were subaerially exposed and experienced weathering process, which is indicated by the mottled clay in the lower part of core PRD11. 2） From 9 010 to 7 000 cal a. B.P.,an estuary environment began to develop at the site of core PRD11. 3） From 7 000 to 5 460 cal. a B.P., a decrease in water depth occured. 4） From 5 460 to 3 340 cal. a B.P., water depth increased again, with the largest water depth at around 4 546 cal. a B.P.. 5） Since 3 340 cal. a B.P., the environment gradually changed into an alluvial plain setting, with enhanced fluvial influence.