The study on geochemical characteristics and enrichment mechanism of deep sea REY-rich sediments in the Central Indian Ocean Basin

Sun Yi; Shi Xuefa; Yan Quanshu; Liu Xijun; Yu Miao; Huang Mu; Bi Dongjie; Li Jia; Zhu Aimei; Gao Jingjing; Wang Hongmin; Zhang Zhaoqi

doi:10.12284/hyxb2022135

Volume 44 Issue 11

Nov. 2022

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Sun Yi，Shi Xuefa，Yan Quanshu, et al. The study on geochemical characteristics and enrichment mechanism of deep sea REY-rich sediments in the Central Indian Ocean Basin[J]. Haiyang Xuebao，2022, 44(11)：42–62 doi: 10.12284/hyxb2022135

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The study on geochemical characteristics and enrichment mechanism of deep sea REY-rich sediments in the Central Indian Ocean Basin

doi: 10.12284/hyxb2022135

Sun Yi^{1, 2, 3
,},
Shi Xuefa^{1, 2
,
,},
Yan Quanshu^{1, 2},
Liu Xijun^{3
,
,},
Yu Miao^{1, 2},
Huang Mu^{1, 2},
Bi Dongjie^{1, 2},
Li Jia^{1, 2},
Zhu Aimei^{1, 2},
Gao Jingjing^{1, 2},
Wang Hongmin^{1, 2},
Zhang Zhaoqi^{1, 2, 3}

1.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
3.
Guangxi Key Laboratory of Hidden Metallic Ore Deposils Exploration, Guilin University of Technology, Guilin 541004, China

Received Date: 2022-03-14
Rev Recd Date: 2022-05-25

Available Online: 2022-08-01

Publish Date: 2022-11-03

Abstract

Abstract

In this paper, sediment smear observations, X-ray diffraction analyses, major, trace and rare earth elements analyses, and in situ micro zone geochemical analyses of single minerals were carried out on samples of core GC02 and GC06 from the rare earth-rich deep-sea sediments in the Central Indian Ocean Basin to explore their geochemical characteristics, material sources and enrichment mechanisms of rare earth elements (REY). The results show that the sediment types of core GC02 are calcareous clay and zeolitic clay, and the sediment types of core GC06 are calcareous clay, zeolite-bearing clay and zeolitic clay. Rare earth elements are enriched in zeolite-bearing clays and zeolitic clays. The North American Shale Composite (NASC) Standardized patterns of REY in the sediments indicate a possible seawater origin. Mineralogical and geochemical signatures indicate that the terrestrial fraction of these sediments in the study area should be the eolian dust material originated primarily from Australian. Elemental correlations and CaO/P₂O₅ ratios indicate that the main host mineral of REY in REY-rich deep-sea sediments is bioapatite (fish teeth/bone), followed by Fe-Mn micronodule. This study summarizes and discusses the formation mechanism of REY-rich sediments and improves a conceptual model for the formation process of REY-rich sediments.
- Central Indian Ocean Basin,
- rare earth-rich deep-sea sediments,
- geochemistry,
- rare earth sources,
- REY-host minerals,
- enrichment mechanism

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References(78)

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