Discovery of native aluminum and its possible origin from prospective gas hydrate areas in the South China Sea
Chen, Z; Huang, CY; Wu, BH; Zhao, MX; Yan, W; chzhsouth@scsio.ac.cn
2010
发表期刊SCIENCE CHINA-EARTH SCIENCES
ISSN1674-7313
卷号53期号:3页码:335-344
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.
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
关键词Native Aluminum Cold Seep Gas Hydrate Reducing Environment South China Sea
学科领域Geosciences, Multidisciplinary
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收录类别sci
资助项目LMB
WOS记录号WOS:000276595900003
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/3862
专题中科院海洋生物资源可持续利用重点实验室
通讯作者chzhsouth@scsio.ac.cn
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Chen, Z,Huang, CY,Wu, BH,et al. Discovery of native aluminum and its possible origin from prospective gas hydrate areas in the South China Sea[J]. SCIENCE CHINA-EARTH SCIENCES,2010,53(3):335-344.
APA Chen, Z,Huang, CY,Wu, BH,Zhao, MX,Yan, W,&chzhsouth@scsio.ac.cn.(2010).Discovery of native aluminum and its possible origin from prospective gas hydrate areas in the South China Sea.SCIENCE CHINA-EARTH SCIENCES,53(3),335-344.
MLA Chen, Z,et al."Discovery of native aluminum and its possible origin from prospective gas hydrate areas in the South China Sea".SCIENCE CHINA-EARTH SCIENCES 53.3(2010):335-344.
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