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TANG Rong, FENG Xiuli, FENG Li, XIAO Xiao, FENG Zhiquan. Geochemical characteristics and paleoenvironmental significance of the major elements in the sediments of Core TS6 from the southern part of Southwest Taiwan Basin of the South China Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 58-69. doi: 10.16562/j.cnki.0256-1492.2019032702
Citation: TANG Rong, FENG Xiuli, FENG Li, XIAO Xiao, FENG Zhiquan. Geochemical characteristics and paleoenvironmental significance of the major elements in the sediments of Core TS6 from the southern part of Southwest Taiwan Basin of the South China Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(2): 58-69. doi: 10.16562/j.cnki.0256-1492.2019032702
shu

Geochemical characteristics and paleoenvironmental significance of the major elements in the sediments of Core TS6 from the southern part of Southwest Taiwan Basin of the South China Sea

  • 1.

    College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

  • 2.

    Key Laboratory of Submarine Geosciences and Prospecting, Qingdao 266100, China

  • 3.

    The First Monitoring and Application Center, CEA, Tianjing 300180, China

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Received Date:  27 March 2019
Revised Date:  01 May 2019
Publish Date:  25 April 2020
    Abstract

  • Geochemical characteristics of major elements from the column sample TS6 in the southern part of Southwest Taiwan Basin, together with the grain size and AMS14C dating data are studied for both the changes in depositional environment and climate of the area since the last deglaciation. Vertical distribution of the major elements shows that Mn is autogenous and abundantly enriched near the surface of sediments, suggesting that the modern bottom water is highly oxygen-enriched. The water environmental conditions of the study area, therefore, are very beneficial for the deposition of hydrogenic ferromanganese nodules. Statistical analysis of major elements suggests that the major elements of Al, Fe, Mg, K and Ti represent the terrigenous element association. The ratios of these terrigenous elements, such as Al2O3/TiO2, Fe2O3/TiO2, MgO/TiO2 and MgO/Al2O3, are closely related to climatic fluctuations since the last deglaciation. Two climatic cooling events are observed in the periods of 9.8 kaBP~9.4 kaBP and 6.5 kaBP~5.8 kaBP respectively, indicating that the intensity of East Asian summer monsoon was significantly weakened then. The cooling event happened during the period of 6.5 kaBP ~5.8 kaBP showed a pattern of "double peaks". The ratios of major elements further indicate that there may also be some climatic cooling events around 18.5 kaBP and 15.8 kaBP in the last deglaciation, and the cold event at 15.8 kaBP should correspond to the event of Heinrich 1.

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