Fe-Si-Mn-Oxyhydroxide Encrustations on Basalts at East Pacific Rise near 13°N:An SEM-EDS Study
文献类型：CNKI期刊论文
| 作者 | WANG Xiaoyuan; ZENG Zhigang; QI Haiyan; CHEN Shuai; YIN Xuebo; YANG Baoju
|
| 发表日期 | 2014-12-06 |
| 出处 | Journal of Ocean University of China
 |
| 关键词 | East Pacific Rise Fe-Si-Mn encrustations origin pillow basalt |
| 英文摘要 | Fe-Si-Mn-oxyhydroxide encrustations at the East Pacific Rise(EPR) near 13°N were analyzed using the scanning electron microscope(SEM) with an energy dispersive spectrometer(EDS). These encrustations are mainly composed of amorphous FeSi-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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the National Key Basic Research Program of China (2013CB429700) ; the Shandong Province Natural Science Foundation for Distinguished Young Scholars (JQ200913) ; the National Natural Science Foundation of China (40830849) ; the National Special Fund for the Eleventh Five-Year Plan of COMRA (DY125-12-R-02 and DY125-11-R-05) |
| 卷 | v.13期:06页:39-47 |
| 语种 | 英文; |
| 分类号 | P736.3;P588.145 |
| ISSN号 | 1672-5182 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/190223]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.UniversityofChineseAcademyofSciences |
| 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 13°N:An SEM-EDS Study. 2014. |
入库方式： OAI收割
来源：海洋研究所
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