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

张聪; 李小虎; 李洁; 祝飞扬; 董彦辉; 初凤友

doi:10.3799/dqkx.2021.063

Volume 47 Issue 2

Feb. 2022

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Article Navigation > Earth Science > 2022 > 47(2): 742-756

Zhang Cong, Li Xiaohu, Li Jie, Zhu Feiyang, Dong Yanhui, Chu Fengyou, 2022. Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile. Earth Science, 47(2): 742-756. doi: 10.3799/dqkx.2021.063

Citation:

Zhang Cong, Li Xiaohu, Li Jie, Zhu Feiyang, Dong Yanhui, Chu Fengyou, 2022. Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile. Earth Science, 47(2): 742-756. doi: 10.3799/dqkx.2021.063

Citation:

Zhang Cong, Li Xiaohu, Li Jie, Zhu Feiyang, Dong Yanhui, Chu Fengyou, 2022. Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile. Earth Science, 47(2): 742-756. doi: 10.3799/dqkx.2021.063

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Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile

doi: 10.3799/dqkx.2021.063

Zhang Cong^{1, 2
,
,},
Li Xiaohu^{1, 2
,
,},
Li Jie^{1, 2},
Zhu Feiyang^{1, 2},
Dong Yanhui^{1, 2},
Chu Fengyou^{1, 2}

1.
Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
2.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

Received Date: 2021-03-19
Publish Date: 2022-02-25

Abstract

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 Å 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 Å 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.
- polymetallic nodule,
- elements composition,
- In-situ microanalysis,
- growth mechanism,
- CCFZ area,
- marine geology

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References(47)

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Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile

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