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《Tropical Geography》 2016-03
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Paleoenvironment Reconstruction and Sedimentary Record in the Wanqingsha Area of the Pearl River Estuary

YU Shaohua;CHEN Fang;XIE Yecai;ZHOU Yang;WU Cong;CHEN Chixin;LONG Gui;Guangzhou Marine Geological Survey,Key laboratory of Marine Mineral Resources of Ministry of Land and Resources;Guangdong Geologic Survey Institute;  
In order to reconstruct the eustatic change and paleoenvironment of the estuary of Pearl River since the late Pleistocene, the Core ZK 316-2, which is located in the Wanqingsha district of the Pearl estuary, was chosen to carry on pollen analysis combining with diatom and lithological analyses. Results of diatom and pollen analyses as well as lithological analysis showed that the late Pleistocene experienced a large sea level transgression and regression and two smaller eustatic changes. During the transgression period in the late Pleistocene the pollen assemblages indicated warm and rainy climate, when vegetation was dominated by south sub-tropical Asian evergreen forest, including sub-tropic pollen types Cyclobalanopsis, Altingia, and Hamamelidaceae, etc. The appearing of Sonneratia in this period was deduced from the littoral face, and it represented the altitude of relative sea level. Although the dating year from 14 C results in this oceanic layer was more than 30 ka, the regional pollen assemblages and diatom signals as well as the altitude of global sea level demonstrated that the deposition in the transgressive period during the late Pleistocene was more likely from MIS5, and the two shorter low sea level records probably corresponded to 5b and 5d. The upper layer of the core(less than 13.9 m in depth) was deposited since 2 232 cal. a B.P., and the pollen analysis demonstrated that the vegetation was still dominated by the subtropical evergreen forest, when the climate was colder and dryer during this period as compared with that in the transgressive period of the late Pleistocene. The flourishing of Poaceae, Pinus and Dicranopteris as well as fire records(charcoal) which indicated the anthropogenic disturbance during this period indicated that human activities and cultivated agriculture bloomed, almost synchronizing with the regression of sea level and deposition of the Pearl River delta.
【Fund】: 中国地质调查项目(1212011220528);; 国家青年自然科学基金(41506049);; 国土资源部海底矿产资源重点实验室开放基金(KLMMR-2014-A-02)
【CateGory Index】: P534.63
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