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学科主题: Geosciences, Multidisciplinary
题名: Discovery of native aluminum and its possible origin from prospective gas hydrate areas in the South China Sea
作者: Chen, Z ; Huang, CY ; Wu, BH ; Zhao, MX ; Yan, W
通讯作者: chzhsouth@scsio.ac.cn
关键词: native aluminum ; cold seep ; gas hydrate ; reducing environment ; South China Sea
刊名: SCIENCE CHINA-EARTH SCIENCES
发表日期: 2010
卷: 53, 期:3, 页:335-344
收录类别: sci
部门归属: [Chen Zhong; Yan Wen] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Huang ChiYue] Cheng Kung Univ, Dept Earth Sci, Tainan 701, Peoples R China; [Wu BiHao] Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China; [Zhao MeiXun] Ocean Univ China, Key Lab Marine Chem Theory & Technol, Minist Educ, Qingdao 266100, Peoples R China
项目归属: LMB
摘要: Aluminum is an active amphoteric metal element, but native aluminum (Al) can be formed and preserved in special conditions so that its occurrence has unique geological significance. In this paper, the coarse fractions (> 63 mu m) of 269 samples of surface sediments and of 165 sediment samples in four cores from the South China Sea (SCS) were picked out and analyzed. Al particles were found in only five surface samples and three samples in two sedimentary cores. The particles are grayish or silver white in color with a strongly metallic luster and high plasticity, and they occur as irregular plats, elongated shapes and spherules with botryoidal structures. The identified Al degrees particles belong to cubical system, Fm3m space group with a varying from 4.028x10(-1) nm to 4.059x10(-1) nm. Their chemical compositions consist mainly of Al (95.07%-99.84%) and minor amounts of Si, Fe, Ti, S, Zn, Mg, Ca and trace amounts of K, Na, Cu, Co, P and Mn. Our results show that the identified Al is authigenic, formed in situ in the prospective areas of gas hydrates, and that it is an unreported type of Al occurrence. A possible mechanism of Al formation is proposed: under the strongly reducing micro environments at cold seeps, dissolved Al3+ in sediments is reduced to its metallic state by the strongly reducing agent of H-2 through microbial processes and enzyme action. As a result, the Al particles from the prospective gas hydrate areas in the SCS are the special products, representing the first report on Al from the sediments at cold seeps. The proposed mechanism provides a theoretical basis for further studies on the special biogeochemical processes at cold seeps.
原文出处: 查看原文
WOS记录号: WOS:000276595900003
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/3862
Appears in Collections:中科院海洋生物资源可持续利用重点实验室_期刊论文

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Chen, Z; Huang, CY; Wu, BH; Zhao, MX; Yan, W.Discovery of native aluminum and its possible origin from prospective gas hydrate areas in the South China Sea,SCIENCE CHINA-EARTH SCIENCES,2010,53(3):335-344
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