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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; Wang, RJ, Tongji Univ, Minist Educ, Key Lab Marine Geol, Shanghai 200092, Peoples R China
2001
发表期刊SCIENCE IN CHINA SERIES D-EARTH SCIENCES
ISSN1006-9313
卷号44期号:10页码:912-918
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.
部门归属Tongji Univ, Minist Educ, Key Lab Marine Geol, Shanghai 200092, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Open Lab Marginal Sea Geol & Paleoenvironm, Guangzhou 510301, Peoples R China
关键词Biogenic Silica Accumulation North Atlantic Deep Water Fractionation Silica Preservation Oligocene The norThern South China Sea
学科领域Geosciences, Multidisciplinary
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000173455400007
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4682
专题中科院边缘海地质重点实验室
通讯作者Wang, RJ, Tongji Univ, Minist Educ, Key Lab Marine Geol, Shanghai 200092, Peoples R China
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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.,...&Wang, RJ, Tongji Univ, Minist Educ, Key Lab Marine Geol, Shanghai 200092, Peoples R China.(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.
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