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学科主题: Geosciences, Multidisciplinary
题名: Oligocene biogenic siliceous deposits on the slope of the northern South China Sea
作者: Wang, RJ ; Fang, DY ; Shao, L ; Chen, MH ; Xia, PF ; Qi, JY
通讯作者: Wang, RJ, Tongji Univ, Minist Educ, Key Lab Marine Geol, Shanghai 200092, Peoples R China
关键词: biogenic silica accumulation ; North Atlantic deep water ; fractionation ; silica preservation ; Oligocene ; the northern South China Sea
刊名: SCIENCE IN CHINA SERIES D-EARTH SCIENCES
发表日期: 2001
卷: 44, 期:10, 页:912-918
收录类别: sci
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
项目归属: 海洋地质
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.
原文出处: 查看原文
WOS记录号: WOS:000173455400007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4682
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Wang, RJ; Fang, DY; Shao, L; Chen, MH; Xia, PF; Qi, JY.Oligocene biogenic siliceous deposits on the slope of the northern South China Sea,SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2001,44(10):912-918
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