浅论富钴结壳柱状构造的成因机制

崔迎春; 石学法; 刘季花; 任向文; 尹京武; 郝金华

浅论富钴结壳柱状构造的成因机制

1.
中国科学院, 海洋研究所, 山东, 青岛, 266071;国家海洋局, 第一海洋研究所, 海洋沉积与环境地质国家海洋局, 重点实验室, 山东, 青岛, 266061;中国科学院, 研究生院, 北京, 100039
2.
国家海洋局, 第一海洋研究所, 海洋沉积与环境地质国家海洋局, 重点实验室, 山东, 青岛, 266061
3.
中国地质大学(北京)地学实验中心, 北京, 100083

基金项目: 国际科技合作项目“深海多金属成矿作用和成矿系统研究”资助项目(2006DFB21620);国家自然科学基金项目“富钻结壳生长界面对其成矿过程的制约”资助(40706029);国家自然科学基金项目“太平洋水成铁锰沉积的胶体地球化学成矿动力学”资助(40376016);

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出版历程
- 收稿日期: 2007-04-03
- 修回日期: 2007-06-12

Discussion on the forming mechanism of columnar structure of cobalt-rich crusts

1.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Graduate School, Chinese Academy of Sciences, Beijing 100039, China
2.
Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
3.
Geological Laboratory Center, China University of Geosciences(Beijing), Beijing 100083, China

摘要

摘要: 柱状构造为富钴结壳中多种微观构造类型之一。为探讨富钴结壳柱状构造的形成机制,利用高分辨率电子探针技术分析了位于中太平洋某海山的富钴结壳中柱状构造的微观形态和微区元素化学特征,结果表明,柱状构造是由围绕核心的微层呈弓形外延辐射生长逐渐分枝而成。壳层由亮色、暗色微层交替叠置而成,其中亮色微层富锰、钴、镍和氧,而暗色微层富铁和硅;同一微层各部分的生长速率不同,介于0.27~0.92 mm/Ma。柱状构造壳层亮色、暗色微层交替变化以及相应成分的不同是微观氧化还原环境变化的结果,而柱状构造的分枝和同一微层生长速率的差异则与富钴结壳生长界面有界面双电层有关。
- 富钴结壳 /
- 柱状构造 /
- 界面双电层
Abstract: Columnar structure is one of the microstructures in cobalt-rich crusts.In order to elucidate its forming mechanism, microsco pical features and microprobe element chemistries have been analyzed with a high-resolution backscattered electron probe microscope analyzer on the profile of a cobalt-rich crust from the Mid-Pacific Mountains.The results show that the columnar structure consists of the light microlayers (rich in manganese, cobalt, nickel and oxygen) and gray microlayers (rich in iron and silicon), in which they occuralter nately, and the growth rates of the same micro layer are different and range from 0.27 to 0.92 mm/Ma.The reasons for the diferent colours of microlayers and the component alternation could be the change of redox environments resulting in the different phases of mineral forming.The electrical double layer of growth interface of cobalt-rich crusts could explain the bifurcation of microlayers of columnar structure and the variations of growth ratios in the same microlayer.
- cobalt-rich crust /
- columnar structure /
- electrical double layer

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