1 School of Earth Science and Geological Engineering,Sun Yat-sen University,Guangzhou 510275,Guangdong; 2 Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,Guangdong; 3 School of History and Tourism,Shaanxi University of Technology,Hanzhong 723000,Shaanxi; 4 South China Sea Institute of Planning and Environmental Research,State Oceanic Administration,Guangzhou 510310,Guangdong
Abstract Late Quaternary sedimental records,especially Late Pleistocene transgressive records,are well preserved in Boreholes PRD20 and PRD17 drilled in central Pearl River Delta. Based on the comprehensive analysis of foraminifera and lithological characteristics of Boreholes PRD20 and PRD17,combining with previous researches,palaeoenvironmental changes since the Late Pleistocene have been reconstructed,with the Late Pleistocene transgression highlighted. Before 44500 cal a BP, a fluvial environment developed,indicated by coarse-grained sediments. Between 44,500 and 21300 cal a BP, a drowned valley estuary setting developed with the sea water intrusion into the study area,which was corresponding to the transgression of the Wurm Sub-Interglacial Stage. Two short-term transgression-regression circles can be recognized based on foraminiferal data. It can be deduced that Boreholes PRD20 and PRD17 were located in the fluvial-tidal interaction area of the drowned valley estuary during this period. A mottled clay layer in Borehole PRD17 and a conglomeratic sand layer in Borehole PRD20 ware sandwiched between Upper Pleistocene and Holocene sediments,which were most likely formed by subaerial oxidation of the underlying sediments during the last glacial maximum. The study area was influenced by postglacial sea level rise after around 8000 cal a BP, which was recorded by a peat layer in Borehole PRD20. The foraminferal and sedimental records of Borehole PRD20 suggest a bay head environment during 8000-5500cal a BP. Since then,a deltaic plain facies developed in the study area. As a result of the tectonic uplift,the core site of Borehole PRD17 showed a higher topography and did not accept sediments until 4700 cal a BP, which is much later than in other parts of the Pearl River Delta. During this time,the study area could be occasionally influenced by tidal water with sporadic foraminifera tests.
Corresponding Authors:
Liu Chunlian,born in 1956,is a professor of the School of Earth Science and Geological Engineering,Sun Yat-sen University,with a Ph.D. degree obtained from the University Würzburg,Germany. She is engaged in stratigraphic paleontology and Cenozoic palaeoenvironment. E-mail: eeslcl@mail.sysu.edu.cn.
About author: Yin Jian,born in 1990,is a Ph.D. candidate of the School of Earth Science and Geological Engineering,Sun Yat-sen University. She is engaged in Quaternary. E-mail: yinjian@mail2.sysu.edu.cn.About the corresponding author Liu Chunlian,born in 1956,is a professor of the School of Earth Science and Geological Engineering,Sun Yat-sen University,with a Ph.D. degree obtained from the University Würzburg,Germany. She is engaged in stratigraphic paleontology and Cenozoic palaeoenvironment. E-mail: eeslcl@mail.sysu.edu.cn.
Cite this article:
Yin Jian,Liu Chunlian,Wu Jie et al. Foraminiferal records and palaeoenvironmental changes since the Late Pleistocene in central Pearl River Delta[J]. JOPC, 2016, 18(4): 677-690.
Yin Jian,Liu Chunlian,Wu Jie et al. Foraminiferal records and palaeoenvironmental changes since the Late Pleistocene in central Pearl River Delta[J]. JOPC, 2016, 18(4): 677-690.
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