Grain size and geochemistry of surface sediments in northwestern;continental shelf of the South China Sea

doi:10.1007/s12665-012-2133-x

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质调查局广州海洋地质调查局

	Grain size and geochemistry of surface sediments in northwestern;continental shelf of the South China Sea
	Cai, Guanqiang 3; Miao, Li ; Chen, Hongjun ; Sun, Guihua ; Wu, Jiaoqi ; Xu, Yonghang 1
刊名	ENVIRONMENTAL EARTH SCIENCES
	2013
卷号	70 期号:1 页码:363-380
关键词	Geochemistry Grain size Provenance Correlation analysis South China Sea
ISSN号	1866-6280;EI 1866-6299
DOI	10.1007/s12665-012-2133-x
英文摘要	Eighty-six surface sediments collected from the northwestern continental shelf of the South China Sea (SCS) were analyzed for grain size distribution, calcium carbonate, organic carbon, and major and trace element compositions to investigate sediment provenance and factors controlling their geochemical composition. Sediments from the eastern continental shelf of Hainan Island have higher sand and lower clay content, while the samples from the nearshore Hainan Island have higher contents of gravel and clay. Calcium carbonate contents in samples show a positive correlation with water depth in northwestern shelf of SCS, suggesting that it is related to biological factors. However, the nearshore sediments have higher contents of organic carbon compared to those of the outer shelf, possibly suggesting that the terrigenous organic matter usually deposited in nearshore environments such as bays and estuaries. Compared with the upper continental crust, the samples have relatively lower contents of SiO2 and Al2O3, higher than those of the Pearl and Red river sediments. The low contents of K2O and Na2O in sediments from the northwestern continental shelf are consistent with intense chemical weathering in the river basin due to the seasonally hot and humid climate regime. The sediments mainly consist of three components, including the gravel fraction composed of calcareous debris, the sand fraction composed of quartz, and the silt and clay fractions mainly composed of clay minerals. The content of each component depends on grain size, sediment source, biogenesis, and hydrodynamic conditions, which finally controls the chemical composition of the sediments. The distributions of Co/Al2O3, Cr/Al2O3, and Zr/Sc ratios for sediments in the northwestern continental shelf suggest that source rocks are mainly composed of felsic rocks rather than mafic rocks. There is a distinct difference in sediment source between eastern and western shelf sediments; the eastern shelf sediments are characterized by high Zr/Sc ratios mainly derived from the Pearl River, while the western shelf sediments have relatively low values of Zr/Sc indicating a main contribution possibly sourced from the Red River Basin. Terrigenous materials from Hainan Island usually influence the geochemistry of sediments deposited in the nearshore area.
学科主题	海洋地质学
WOS关键词	EAST-ASIAN MONSOON ; PEARL RIVER ESTUARY ; PROVENANCE DISCRIMINATION ; YELLOW SEA ; RED-RIVER ; ELEMENTS ; ND ; TRANSPORT ; DISCHARGE ; CHEMISTRY
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000323352600032
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39963]
专题	中国地质调查局广州海洋地质调查局
作者单位	1.Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China. 2.State Ocean Adm, Inst Oceanog 3, Xiamen 361005, Peoples R China. 3.中国地质调查局广州海洋地质调查局
推荐引用方式 GB/T 7714	Cai, Guanqiang,Miao, Li,Chen, Hongjun,et al. Grain size and geochemistry of surface sediments in northwestern;continental shelf of the South China Sea[J]. ENVIRONMENTAL EARTH SCIENCES,2013,70(1):363-380.
APA	Cai, Guanqiang,Miao, Li,Chen, Hongjun,Sun, Guihua,Wu, Jiaoqi,&Xu, Yonghang.(2013).Grain size and geochemistry of surface sediments in northwestern;continental shelf of the South China Sea.ENVIRONMENTAL EARTH SCIENCES,70(1),363-380.
MLA	Cai, Guanqiang,et al."Grain size and geochemistry of surface sediments in northwestern;continental shelf of the South China Sea".ENVIRONMENTAL EARTH SCIENCES 70.1(2013):363-380.