南海东北部深海盆末次冰盛期以来陆源碎屑粒度特征及影响因素*

doi:10.11978/2021027

Abstract

Abstract:

A number of factors control the evolution of deep-sea currents in the northeastern South China Sea (SCS), but there is still a lack of deep understanding of sensitive indicators, evolution processes and controlling factors of the bottom currents since the Last Glacial Maximum (LGM). We selected the 16ZBS11 core in the deep-sea basin of ??the northeastern SCS to analyze the grain size and age of the terrigenous sediment. The environmental sensitivity factors were extracted by the grain size-standard deviation method; at the same time, the bottom current intensity and transport capacity were calculated. Our results show that the terrigenous debris in the study area are mainly composed of silt and clay; sandy components only appear in a few layers. The deep-sea sedimentary environment evolution in the northern SCS has gone through three stages: stage Ⅰ: 22.39~16.02 ka BP; stage Ⅱ: 16.02~9.58 ka BP; stage Ⅲ: 9.58 ka BP to present. Interestingly, the components of clay and silt in each evolution stage evoluted in reverse phase. The intensity and transport capacity of the bottom current have decreased gradually since the LGM and changed synchronously. At about 16 ka BP and 11.5 ka BP, the SCS was connected with the Indian Ocean and the Taiwan Strait, respectively, which affected the oceanic processes in the northern SCS. In particular, the changes of mixing patterns and intensities in the northern SCS since 9.58ka BP, profoundly affected the deep-sea terrigenous sediment transport and sedimentary evolution. Our results provide a new understanding of the evolution of bottom current activities in the northern SCS, and new evidence for deep-sea processes in the SCS.

Key words: terrigenous debris, deep-sea basin, grade-standard deviation, bottom-current intensity, northeastern South China Sea

CLC Number:

P736.21

WANG Xuesong, CHEN Zhong, XU Antao, TIAN Yuhang, CAO Li, ZHANG Bin. Grain size characteristics and influencing factors of terrigenous sediment in the deep-sea basin of the northeastern South China Sea since the Last Glacial Maximum[J].Journal of Tropical Oceanography, 2022, 41(1): 158-170.

Figures/Tables 10

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层位/cm	测试材料	AMS¹⁴C年龄 /a BP	校正年龄 /Cal. a BP	年龄范围 /a BP( ±1σ)
9~10	有孔虫混合种	2290±30	1726	1567~1877
59~60	有孔虫混合种	7080±30	7385	7247~7518
161~162	有孔虫混合种	12920±40	14603	14299~14882
279~280	有孔虫混合种	17170±50	19825	19554~20089

		砂/%	粉砂/%	粘土/%	平均粒径/μm	中值粒径/μm	偏态值SK_I	峰态值K_G	分选系数σ_i
阶段Ⅰ	最大值	1.45	70.84	35.58	6.42	6.69	-0.06	1.14	1.43
	最小值	0.00	64.42	28.99	5.24	5.40	-0.12	1.09	1.23
	平均值	0.31	67.13	32.59	5.78	6.01	-0.10	1.11	1.36
阶段Ⅱ	最大值	1.63	67.44	41.73	5.87	6.07	-0.04	1.15	1.42
	最小值	0.00	58.28	32.24	4.43	4.69	-0.16	1.08	1.16
	平均值	0.31	62.76	37.12	5.06	5.28	-0.11	1.11	1.27
阶段Ⅲ	最大值	0.81	64.48	42.24	5.45	5.65	-0.07	1.15	1.37
	最小值	0.00	57.76	34.75	4.40	4.65	-0.15	1.09	1.15
	平均值	0.10	61.68	38.27	4.85	5.09	-0.12	1.11	1.23

Grain size characteristics and influencing factors of terrigenous sediment in the deep-sea basin of the northeastern South China Sea since the Last Glacial Maximum

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