| Fe-Si-Mn-oxyhydroxide encrustations on basalts at east pacific rise near 13A degrees N: An SEM-EDS study | |
Wang Xiaoyuan1; Zeng Zhigang1; Qi Haiyan1; Chen Shuai1; Yin Xuebo1; Yang Baoju1,2 ; Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China.
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| 2014-12-01 | |
| 发表期刊 | JOURNAL OF OCEAN UNIVERSITY OF CHINA
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| 卷号 | 13期号:6页码:917-925 |
| 文章类型 | Article |
| 摘要 | Fe-Si-Mn-oxyhydroxide encrustations at the East Pacific Rise (EPR) near 13A degrees N were analyzed using the scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS). These encrustations are mainly composed of amorphous Fe-Si-Mn-oxyhydroxides forming laminated, spherical, porous aggregates with some biodetritus, anhydrite, nontronite, and feldspar particles. Anhydrite particles and nontronite crystals in the Fe-Si-Mn-oxyhydroxide encrustations imply that the Fe-Si-Mn-oxyhydroxide may have formed under relatively low- to high-temperature hydrothermal conditions. The Fe-Si-Mn-oxyhydroxide encrustations on pillow basalts are 1-2 mm thick. The growth rate of ferromanganese crusts in the survey area suggests that these encrustations are an unlikely result of hydrogenic deposition alone having a hydrothermal and (Fe/Mn ratio up to 7.7 and Fe/(Fe+Mn+Al) ratio exceeding 0.78) hydrogenic origin (0.22 Fe/Mn ratio close to the mean value of 0.7 for open-ocean seamount crusts). The varying Fe/Mn ratios indicate that the Fe-Si-Mn-oxyhydroxide encrustations have formed through several stages of seafloor hydrothermalism. It is suggested that, at the initial formation stage, dense Fe-Si-oxyhydroxides with low Mn content deposit from a relatively reducing hydrothermal fluid, and then the loose Fe-Si-Mn-oxyhydroxides deposit on the Fe-Si-oxyhydroxides. As the oxidation degree of hydrothermal fluid increases and Si-oxide is inhibited, Mn-oxide will precipitate with Fe-oxyhydroxides. |
| 关键词 | East Pacific Rise Fe-si-mn Encrustations Origin Pillow Basalt |
| 学科领域 | Oceanography |
| DOI | 10.1007/s11802-014-2358-2 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000344788700005 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/23812 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China. |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Wang Xiaoyuan,Zeng Zhigang,Qi Haiyan,et al. Fe-Si-Mn-oxyhydroxide encrustations on basalts at east pacific rise near 13A degrees N: An SEM-EDS study[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2014,13(6):917-925. |
| APA | Wang Xiaoyuan.,Zeng Zhigang.,Qi Haiyan.,Chen Shuai.,Yin Xuebo.,...&Zeng, ZG .(2014).Fe-Si-Mn-oxyhydroxide encrustations on basalts at east pacific rise near 13A degrees N: An SEM-EDS study.JOURNAL OF OCEAN UNIVERSITY OF CHINA,13(6),917-925. |
| MLA | Wang Xiaoyuan,et al."Fe-Si-Mn-oxyhydroxide encrustations on basalts at east pacific rise near 13A degrees N: An SEM-EDS study".JOURNAL OF OCEAN UNIVERSITY OF CHINA 13.6(2014):917-925. |
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