TROPICAL GEOGRAPHY ›› 2016, Vol. 36 ›› Issue (3): 355-363.doi: 10.13284/j.cnki.rddl.002830

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Holocene Mollusc Records and Palaeoenvironmental Changes in the Pearl River Delta

LIU Chunyao1,YIN Jian1,2,LIU Chunlian1,2,HUANG Yi3,WU Yueqin1   

  1. (1.School of Earth Science and Geological Engineering,Sun Yat-sen University,Guangzhou 510275,China;2.Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China;3.South China Sea Institute of Planning and Environmental Research, State Oceanic Administration,Guangzhou 510310,China)
  • Online:2016-05-05 Published:2016-05-05

Abstract: 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.

Key words: the Pearl River Delta, bivalves, gastropods, palaeoenvironment, Holocene