Citation: | ZHANG Jiangyong, ZHAO Li, LI Bo, LI Xuejie, ZHONG Hexian, TIAN Chengjing. 2020. Carbonate cycle in sub-bottom strata in the South China Sea and the east sea area of Taiwan Island[J]. Geology in China, 47(5): 1486-1500. doi: 10.12029/gc20200514 |
It was discovered that there existed two classic types of carbonate cycle, namely, Atlantic type and Pacific type, in the late Quaternary sediments in the South China Sea. In this paper, some characteristics of carbonate cycles in the South China Sea and the sea area southeast of Taiwan were discussed using the data of δ18O, CaCO3 content, Al2O3 content, SiO2 content, planktonic foraminireral abundance, and calcareous nannofossil abundance. These data were derived from thirteen cores. Generally, CaCO3content and SiO2 content are good proxies for the representation of carbonate cycles, and these two variables often display inverse relationship. In the study area, the types of carbonate cycle include not only the classic Atlantic and Pacific types, but also irregular forms. The Atlantic- type carbonate cycle is intimately related to sea level fluctuation in the glacial- interglacial cycle, and the studied cores with this type cycle are mainly located in the region whose water depth is less than 3000 m in the South China Sea. The Atlantic-type carbonate cycle on the north slope of the South China Sea was likely accompanied by the enrichment process of coarser (finer) particles during the periods of sea level descent (rise). The cores featured by Pacific- type carbonate cycle in the South China Sea are distributed within a big depth range across the modern calcite lysocline, which suggests that carbonate dissolution cycle was not the primary cause of the Pacific- type carbonate cycle. The carbonate cycle type of the studied core derived from the sea area east of Taiwan was neither Atlantic-type nor Pacific-type. The sedimentation rates of sub-bottom strata in the study area had little relationship with the types of carbonate cycle, but were deeply influenced by water depth and the glacialinterglacial sea level fluctuations. The sedimentation rates were increased with increasing water depth, and the average sedimentation rates during MIS2 was more than twice the ones during MIS1.
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Geographic locations of sediment cores
Stratigraphic division and the changes of CaCO3, Al2O3 , SiO2 contents, Al2O3/SiO2 ratio, planktonic foraminireral abundance,and abundance of calcareous nannofossils of cores TP86 and HYD235
Stratigraphic division and the changes of CaCO3 content, Al2O3 content, SiO2 content, Al2O3/SiO2 ratio, planktonic foraminireral abundance, and abundance of calcareous nannofossils of core TP71
Stratigraphic division and the changes of CaCO3, Al2O3, SiO2 contents, Al2O3/SiO2 ratio, planktonic foraminireral abundance, and abundance of calcareous nannofossils, and the scatter plot between Al2O3 content and SiO2 of core BKAS81PC
Stratigraphic division and the changes of CaCO3 , Al2O3, SiO2 contents, Al2O3/SiO2 ratio, planktonic foraminireral abundance,and abundance of calcareous nannofossils of the four cores located in northwestern South China Sea
Stratigraphic division and the changes of CaCO3, Al2O3, SiO2 contents, Al2O3/SiO2 ratio, planktonic foraminireral abundance, and abundance of calcareous nannofossils of the four cores located in northeastern South China Sea
Stratigraphic division and the changes of CaCO3 , Al2O3, SiO2 contents, Al2O3/SiO2 ratio, planktonic foraminireral abundance, and abundance of calcareous nannofossils of core GX15 in the sea area southeast of Taiwan island
Stratigraphic division and the changes of CaCO3 content of core SO50-29KL located at the northern abyssal plain of the South China Sea (after Wang Pinxian et al., 1995)
Cores with different types of carbonate cycle and the water depth of cores in the South China Sea and the east sea area of Taiwan Island
Scatter plots between water depths and average sedimentation rates during MIS1 (a) and MIS2 (b) and the ratios of average sedimentation rates during MIS1 and during MIS2 (c)in the South China Sea and the east sea area of Taiwan island