Oligocene biogenic siliceous deposits on the slope of the northern South China Sea

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	Oligocene biogenic siliceous deposits on the slope of the northern South China Sea
	Wang, RJ ; Fang, DY ; Shao, L ; Chen, MH ; Xia, PF ; Qi, JY
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2001
卷号	44 期号:10 页码:912-918
关键词	biogenic silica accumulation North Atlantic deep water fractionation silica preservation Oligocene the northern South China Sea
ISSN号	1006-9313
通讯作者	Wang, RJ, Tongji Univ, Minist Educ, Key Lab Marine Geol, Shanghai 200092, Peoples R China
中文摘要	The abundance of radiolarian, diatom and sponge spicule and H4SiO4 in pore-waters increase abruptly at the boundary between Early and Late Oligocene (about 30-27.5 Ma) at Site 1148 of the northern South China Sea (SCS), indicating high biogenic silica accumulation during this time. At the same time (about 30-28 Ma), high biogenic silica deposition occurred in the central equatorial Pacific. Comparison of the biogenic silica accumulation at Site 1148 of the SCS with that at Site 929 of the Atlantic verifies that the biogenic silica accumulation between the low latitude Pacific and Atlantic oceans expresses the evident relationship of compensation during the Oligocene. Biogenic silica accumulation decreased in the Atlantic, whereas it increased in the Pacific at the boundary between the Early and Late Oligocene. It resulted from the formation and presence of North Atlantic deep water (NADW) in the Atlantic basin, indicating an intensive basin-basin fractionation. XRD analysis and SEM observation of the samples from Site 1148 demonstrate that most of radiolarian, diatom and sponge spicule have suffered from dissolution and reprecipitation, suggested by the opal-A-->opal-CT transformation. As a result of the transformation, porosity increased, but dry and bulk densities decreased, reflecting the consequence of diagenesis on the physical property of sediment.
学科主题	Geosciences, Multidisciplinary
收录类别	SCI
原文出处	SCIENCE CHINA PRESS
WOS记录号	WOS:000173455400007
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/4682]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Wang, RJ,Fang, DY,Shao, L,et al. Oligocene biogenic siliceous deposits on the slope of the northern South China Sea[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2001,44(10):912-918.
APA	Wang, RJ,Fang, DY,Shao, L,Chen, MH,Xia, PF,&Qi, JY.(2001).Oligocene biogenic siliceous deposits on the slope of the northern South China Sea.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,44(10),912-918.
MLA	Wang, RJ,et al."Oligocene biogenic siliceous deposits on the slope of the northern South China Sea".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 44.10(2001):912-918.