PACMANUS热液区Si-Fe-Mn氧化物的显微结构特征及意义  

Microstructure of the Si-Fe-Mn oxide from the PACNANUS hydrothermal field and its implications

作　　者：欧阳荷根[1,2,3] 曾志刚[1] 张国良[1] 陈帅[1,3] 殷学博[1] 汪小妹[1] 王晓媛[1] 

机构地区：[1]中国科学院海洋研究所,山东青岛266071 [2]中国科学院海洋地质与环境重点实验室,山东青岛266071 [3]中国科学院研究生院,北京100049

出　　处：《海洋科学》2010年第8期69-75,共7页Marine Sciences

基　　金：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)

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。With optic microscope, electronic probe and scanning electron microscope analytical methods, the microstrueture 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.

关 键 词：东马努斯海盆 Si—Fe-Mn氧化物 Fe羟基氧化物 

分 类 号：P736.12[天文地球—海洋地质] P571[天文地球—海洋科学]