| 摘要: |
| 用显微镜、电子探针和扫描电镜等分析技术, 对2008 年“KX08-973”航次中国首次在东马努斯海盆PACMANUS 热液区用拖网取得的少量Si-Fe-Mn 氧化物海底热液产物样品进行显微结构特征研究。研究表明, 显微镜下, 样品呈隐晶质结构; 扫描电镜下可见已石化的硅藻; 电子探针分析结果显示,Fe 和Mn 的分布具有明显的分带性, 呈现出Si-Mn 质层被Si-Fe 质层包裹的特征, 反应了Si-Fe-Mn 氧化物的形成具有多期多阶段性特征。样品是富Si, Fe 和Mn 的低温热液流体直接沉淀产物。本研究结果对该区热液氧化物的进一步研究, 如Si-Mn 质层和Si-Fe 质层中Si 与Mn 和Fe 的化合方式、微生物在热液氧化物形成过程中的作用具有指导意义。 |
| 关键词: 东马努斯海盆 Si-Fe-Mn 氧化物 Fe 羟基氧化物 |
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| 基金项目:中国科学院知识创新工程重要方向项目(KZCX2-YW-211,KZCX3-SW-223); 国家自然科学基金项目(40830849, 40976027,40906029); 山东省自然科学杰出青年基金项目(JQ200913) |
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| Microstructure of the Si-Fe-Mn oxide from the PACNANUS hydrothermal field and its implications |
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OUYANG He-gen,ZENG Zhi-gang,ZHANG Guo-liang,CHEN Shuai,YIN Xue-bo,WANG Xiao-mei,WANG Xiao-yuan
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| Abstract: |
| With optic microscope, electronic probe and scanning electron microscope analytical methods, the microstructure of the Si-Fe-Mn oxide, which had been collected by trawl during the expedition of “KX08-973” on the PACMANUS hydrothermal field, Eastern Manus Basin, in 2008 was analyzed. The Si-Fe-Mn oxide exhibited cryptocrystalline texture under optic microscope; and fossilized diatoms were found under scanning electron microscope. The electronic probe results revealed that the distributions of Fe and Mn were zoned and manifested the characteristics of Si-Mn layer enveloped by Si-Fe layer, reflecting a multi-staged formation of the Si-Fe-Mn oxide. The Si-Fe-Mn oxide was a result of direct precipitation of low temperature hydrothermal fluid, which rich in Si, Fe and Mn. This study will facilitate further research of Si-Fe-Mn oxide in this hydrothermal field, such as the combining of Si with Mn and Fe in the Si-Mn layer and Si-Fe layer and the role of the microbes during the forming of the Si-Fe-Mn oxide. |
| Key words: Eastern Manus Basin Si-Fe-Mn oxide Fe-oxyhydroxide |
