| 东太平洋CCFZ区多金属结核元素富集机制:来自结核剖面原位微区分析 |
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| 引用本文： | 张聪,李小虎,李洁,祝飞扬,董彦辉,初凤友.东太平洋CCFZ区多金属结核元素富集机制:来自结核剖面原位微区分析[J].地球科学,2022,47(2):742-756. |
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| 作者姓名： | 张聪 李小虎 李洁 祝飞扬 董彦辉 初凤友 |
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| 作者单位： | 1.自然资源部海底科学重点实验室, 浙江杭州 310012 |
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| 基金项目： | 中国大洋协会“十三五”资源环境项目（Nos.DY135-N1-1,DY135-G2-1-03,DY135-S2-2-05）；;中央级公益性科研院所基本科研业务费专项（No.JT1701）；;中国地质调查局地质调查项目（No.DD20191043）； |
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| 摘 要： | 多金属结核微层原位微区分析能够更好地揭示结核生长过程中元素的赋存和迁移过程，为认识多金属结核元素富集机制和成因提供新的证据.通过使用电子探针（EPMA）和激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）等手段对采集自东太平洋克拉里昂-克利珀顿断裂区（CCFZ区）的多金属结核进行了分析研究.研究结果表明，结核矿物主要为水羟锰矿、10?锰矿和FeOOH，锰铁矿物圈层由内而外可划分为4个明显的层组:L1、L2、L3和L4，Mn和Fe的平均含量分别为32.2和13.3%、39.1和5.2%、37.0和3.4%、33.1和7.8%，Mn/Fe值整体表现为增大的趋势，对应Mn/Fe值分别为2.8、16.6、19.7和10.6，Co+Ni+Cu含量变化与之相似，平均含量分别为1.9%、3.3%、3.8%和3.0%.元素含量关系表明，Co主要赋存在水成成因的水羟锰矿中，Ni、Cu主要赋存在Mn相矿物中，但成岩成因的10?锰矿对Ni、Cu等元素的富集能力强于水羟锰矿；结合元素组成和显微构造将其划分为水成型层、混合型层、成岩型层和混合型层，结核整体的生长作用趋势从水成型转变为成岩型.
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| 关 键 词： | 多金属结核 元素组成 微区分析 生长机制 太平洋CCFZ区 海洋地质 |
| 收稿时间： | 2021-03-19 |
Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile |
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| Zhang Cong,Li Xiaohu,Li Jie,Zhu Feiyang,Dong Yanhui,Chu Fengyou.Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile[J].Earth Science-Journal of China University of Geosciences,2022,47(2):742-756. |
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| Authors: | Zhang Cong Li Xiaohu Li Jie Zhu Feiyang Dong Yanhui Chu Fengyou |
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| Abstract: | In-situ microanalysis of polymetallic nodule can better reveal the occurrence and migration of elements in the growth process of polymetallic nodules than bulk nodule analysis, and provide new evidence for understanding the enrichment mechanism and genesis of polymetallic nodules. In this study, electron probe microanalysis (EPMA) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) were used to analyze the polymetallic nodule collected from the Clarion-Clipperton Fault Zone (CCFZ) of the East Pacific Ocean. The results show that the main minerals of the nodule are vernadite, 10 ? manganite and FeOOH. From the inside to the outside, the ferromanganese nodule can be divided into four distinct layer groups: L1, L2, L3 and L4, the average contents of Mn and Fe are 32.2 and 13.3%, 39.1 and 5.2%, 37.0 and 3.4%, 33.1 and 7.8%, respectively. The Mn/Fe ratio increases as a whole, and corresponding to 2.8, 16.6, 19.7 and 10.6, respectively. The variation of Co+Ni+Cu content shows similar trend, with the average content of 1.9%, 3.3%, 3.8% and 3.0%, respectively.The relationship of element content shows that Co mainly occurs in hydrogeneticvernadite, Ni and Cu both occur in hydrogenetic and diagenetic Mn phase minerals, while the enrichment ability of diagenetic 10 ? manganite is stronger than hydrogeneticvernadite. Based on the element composition and microstructure, the layers can be divided into hydrogenetic layer, mixed layer, diagenetic layer and mixed layer, respectively, and the nodules experienced hydrogenetic growth and diagenetic growth successively. |
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