On mineralogical and geochemical records of paleosedimentary environmental variation in the northeastern South China Sea since the late Pleistocene

YANG Qun-hui; ZHANG Fu-yuan; LIN Zhen-hong; ZHOU Huai-yang

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Article Navigation > Haiyang Xuebao > 2004 > 26(2): 72-80

YANG Qun-hui, ZHANG Fu-yuan, LIN Zhen-hong, ZHOU Huai-yang. On mineralogical and geochemical records of paleosedimentary environmental variation in the northeastern South China Sea since the late Pleistocene[J]. Haiyang Xuebao, 2004, 26(2): 72-80.

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On mineralogical and geochemical records of paleosedimentary environmental variation in the northeastern South China Sea since the late Pleistocene

1.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China
3.
Ocean University of China, Qingdao 266003, China

Received Date: 2002-08-25
Rev Recd Date: 2003-06-02

Abstract

Abstract

Based on the clastic mineralogical and geochemical characteristics, it is indicated that the core 69 with a length of 560 cm (20°07.10"N, 118°49.0'E; 2 971 m water depth) sampled by gravity piston corer from the north-eastern South China Sea could be divided into the late Pleistocene last glacial period and the Holocene epoch with a boundary at about 165 cm.This result consists with that of the oxygen and carbon stable isotopic analyses of planktonic foraminifers.During the last glacial period, there was a relatively closed anoxic environment, dry and cold climate, weak chemical weathering conditions which were suggested by the characteristics of higher content of heavy mineral with abundant authigenic pyrite, higher SiO₂ and S contents, and lower CaCO₃ content, as well as higher ratios of Na to Al, Mg to Al and Na to K in sedimentary samples.The sediments are composed mainly of siliceous deposits.The lower CaCO₃ contents of sediments might caused by the dilution of terrigenous components.In turn, during the postglacial period, the CaCO₃ and Al₂O₃ contents became higher, and the ratios of Na to Al, Mg to Al and Na to K decreased, which reflected that the sedimentary environment became an open oxidation environment, the climate became humid and hot with a stronger condition of chemical weathering.The sediments are composed mainly of aluminosilicate deposits.Furthermore, the maximum carbonate content occurs in the deglaciation period.
- South China Sea,
- mineralogical and geochemical records,
- paleosedimentary environment.

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References(29)

References

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