Discovery of native aluminum and its possible origin from prospective gas hydrate areas in the South China Sea

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院海洋生物资源可持续利用重点实验室

	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
刊名	SCIENCE CHINA-EARTH SCIENCES
	2010
卷号	53 期号:3 页码:335-344
关键词	Native Aluminum Cold Seep Gas Hydrate Reducing Environment South China Sea
ISSN号	1674-7313
英文摘要	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.
学科主题	Geosciences, Multidisciplinary
URL标识	查看原文
资助项目	LMB
WOS记录号	WOS:000276595900003
公开日期	2011-07-02
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/3862]
专题	南海海洋研究所_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
推荐引用方式 GB/T 7714	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.