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学科主题: Multidisciplinary Sciences
题名: The genesis and environmental significance of red and black sedimentary interlayers in coral reef of well Nanyong 2
作者: Wen, Y ; Tan, XZ ; Chen, Z ; Chen, ML ; Gu, SC
关键词: Nansha Islands ; coral reef ; red and black sedimentary interlayers ; genesis and environment
刊名: CHINESE SCIENCE BULLETIN
发表日期: 2002
卷: 47, 期:4, 页:343-347
收录类别: sci
部门归属: Chinese Acad Sci, SCSIO, Open Lab Geol & Paleoenvironm Marginal Sea, Guangzhou 510301, Peoples R China
项目归属: 海洋地质
摘要: The results of paleogeomagnetics and geochemistry of the coral reef in well Nanyong 2 of Nansha Islands showed that the bottom of the black sedimentary interlayer corresponds to the conversion boundary line between Brunhes Postive Polarity and Matuyama Reversed Polarity (B/M) and the cold/warm (19/20) climatic conversion bounds on delta(18)O curve, 0.78 Ma ago; and the red sedimentary interlayer corresponds to the Reunion I polarity excursion (reversion) of the geomagnetic field, 2.01-2.04 Ma ago. Comparing with the normal light-coloured coral reef rock, the magnetic susceptibility (chi), residual magnetization intensity (Mr) and the content of MnO and Fe2O3 Of the black sedimentary layer appeared obviously positive abnormity. The magnetic susceptibility (chi), residual magnetization intensity (Mr) and the content of Fe2O3 Of the red sedimentary layer also appeared positive abnormity. Combining with the analyzing results of paleontology, we hold that this pair of special and typical sedimentary interlayers was relative to the sudden change of paleoclimate, i.e. the global climatic change and its incidental polarity reversal of the geomagnetic field directly affected the living environment of the paleontological species as well as the dispersion and enrichment of some chemical elements, especially the elements sensitive to redox such as Fe and Mn. For example, the elements Fe and Mn concentrated in the glacial period would be largely oxidized and diluted when the climate warmed up suddenly, and the originally oxidized high valence Fe would be condensed again when the climate cooled suddenly. This is possibly one of the important reasons of appearing and disappearing of the red and black sedimentary events of coral reef in well Nanyong 2.
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WOS记录号: WOS:000175218100019
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4720
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Wen, Y; Tan, XZ; Chen, Z; Chen, ML; Gu, SC.The genesis and environmental significance of red and black sedimentary interlayers in coral reef of well Nanyong 2,CHINESE SCIENCE BULLETIN,2002,47(4):343-347
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