1 中山大学地球科学系，广东广州 510275 2 中国科学院边缘海地质重点实验室，广州地球化学研究所，广东广州 510640 3 Institut für Paleontologie der Universitt Würzburg，Würzburg 97070，Germany
High resolution ostracod records of borehole PRD05 and the Late Quaternary palaeoenvironment in Pearl River Delta
Liu Chunlian1,2, Franz T Fürsich3, Dong Yixin1, Che Xiaoguang1, Chen Liang1, Zhuang Chang1
1 Department of Earth Sciences， Sun Yat-Sen University， Guangzhou 510275，Guangdong 2 CAS Key Laboratory of Marginal Sea Geology，Guangzhou Institute of Geochemistry， Guangzhou 510640，Guangdong 3 Institut für Paleontologie der Universitt Würzburg， Würzburg 97070， Germany
Abstract：A high resolution study has been carried out on the sediments and ostracod faunas of borehole PRD05 drilled near the Xijiang inlet in the Pearl River Delta area. The analytical results suggest that the interplay between sea level fluctuations and river processes led to the environmental changes in the study area during the Late Quaternary. A fluvial environment began to develop before 26600\{a BP\}. Coarse-grained sediments at the bottom of the core indicate a very high energy condition. The reduction of grain size upwards implies a decrease of energy and fluvial overbank was developed. Between 26600 and 13400\{a BP\}，the environment was characterized by a flood plain. The upper part of the fluvial sediments experienced weathering and erosion during the last maximum glacial episode and was changed to the variegated clay. The postglacial transgression occurred around 13400\{a BP\}. In the first phase of transgression，a marsh environment dominated in the study area. At around 9000\{a BP\}，the rate of sea level rise rapidly increased and an estuary environment with marine-brackish ostracod faunas continuously existed until 4850\{a BP\}. Three second-order sea level fluctuations can be recognized based on the composition and abundance of ostracods. The maximum transgression occurred between 7500 and 7140\{a BP\}，evidenced by the highest diversity and abundance of ostracods in the borehole. Since 4850\{a BP\}，a regressive trend was recorded in the borehole. The environment gradually changed into a deltaic plain with the increased influence of river processes.
刘春莲,Franz T Fürsich,董艺辛等. 珠江三角洲PRD05孔的高分辨率介形类记录与晚第四纪古环境重建*[J]. 古地理学报, 2008, 10(3): 313-322.
Liu Chunlian,Franz T Fürsich,Dong Yixin et al. High resolution ostracod records of borehole PRD05 and the Late Quaternary palaeoenvironment in Pearl River Delta[J]. JOPC, 2008, 10(3): 313-322.
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