Characteristics and possible origin of native aluminum in cold seep sediments from the northeastern South China Sea

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• 作者：Zhong Chen ; Chi-Yue Huang ; Meixun Zhao ; Wen Yan ; Chih-Wei Chien ; Muhong Chen ; Huaping Yang ; Hideaki Machiyama ; Saulwood Lin
• 关键词：Native aluminum (Al° ; ) ; Cold seep ; Formation mechanism ; South China Sea ; Microbial processes
• 刊名：Journal of Asian Earth Sciences
• 出版年：2011
• 出版时间：4 January 2011
• 年：2011
• 卷：40
• 期：1
• 页码：363-370
• 全文大小：1138 K

文摘

Although native aluminum (Al°) has been reported to occur in various geological settings for more than 20 locations but its mechanism of formation still remains to be elucidated. We report the occurrence and characterization of Al° particles recovered from the surface sediment (CF4) and a short core sediment (ROV-G, 37 cm length) obtained at cold seeps in the northeastern continental slope (NCS) of the South China Sea (SCS). X-ray diffraction analysis shows that the collected particles are metallic aluminum with the unit cell edge a of 4.059 ± 0.005 Å (CF4#2) and 4.029 ± 0.004 Å (T26–28#2, ROV-G). The Al° particles occur as spherules, irregular plates and elongated forms with typical lamellar structures. Their chemical compositions are 95.07–99.84 % Al (the average values is 98.42 % ) with very small amounts of Si, Fe, Ti, S, Zn, Mg, Ca, K, Na, Cu, Co and P, and are similar to Al° particles from the East Pacific Rise and the Central Indian Basin but differ markedly to those from other locations. After ruling out several possibilities of Al° sources and mechanism of formation, an alternative cold seep mechanism is proposed for the origin of Al° in the SCS. During the processes of anaerobic oxidation of methane (AOM) and pyrite formation, high H₂S and H₂ partial pressures result in strong reducing micro-environments, under which is reduced to its metallic state by the microbial-bacterial processes.