Occurrence phases of rare earth elements and platinum group elements in cobalt-rich crusts from the Seamount Xufu in the Pacific

Gao Jingjing; Liu Jihua; Zhang Hui; Wang Hongmin; Cui Jingjing; He Lianhua

doi:10.12284/hyxb2021194

Volume 43 Issue 11

Dec. 2021

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Gao Jingjing，Liu Jihua，Zhang Hui, et al. Occurrence phases of rare earth elements and platinum group elements in cobalt-rich crusts from the Seamount Xufu in the Pacific[J]. Haiyang Xuebao，2021, 43(11)：77–87 doi: 10.12284/hyxb2021194

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Occurrence phases of rare earth elements and platinum group elements in cobalt-rich crusts from the Seamount Xufu in the Pacific

doi: 10.12284/hyxb2021194

Gao Jingjing^{1, 2
,},
Liu Jihua^{1, 2
,
,},
Zhang Hui^{1, 2},
Wang Hongmin^{1, 2},
Cui Jingjing^{1, 2},
He Lianhua^{1, 2}

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

Received Date: 2021-06-08
Rev Recd Date: 2021-08-17

Available Online: 2021-09-06

Publish Date: 2021-12-31

Abstract

Abstract

The geochemistry, occurrence phase and enrichment mechanism of REE and PGE were studied in cobalt-rich crusts from the Seamount Xufu in the Pacific by ICP-OES, ICP-MS and phase analysis methods. The results showed that, REE and PGE were enriched in cobalt-rich crusts, REE contents were 1 842−2854 μg/g, and PGE contents were 144−1180 ng/g. REE and PGE contents in the old layers were higher than that in the new layers, and the phosphatization in the old layers might play an active role in the REE and PGE enrichment. Moreover, LREE contents were more than HREE contents, and REE diagrams showed the positive Ce anomalies and no Eu anomalies, so Ce was enriched in cobalt-rich crusts. Meanwhile, there was an obvious contrast between PGE, and PPGE contents were more than IPGE contents. PGE diagrams showed the positive Pt anomalies and negative Pd anomalies, so Pt was enriched and Pd was poor in cobalt-rich crusts. In addition, REE in the new layers were mainly enriched in the iron oxide phase, and the enrichment ratios were 65.40%−70.05%. While REE in the old layers were mainly enriched in the residual phase, and the enrichment ratios were 62.27%−65.77%, because it might be related to the phosphate. Meanwhile, PGE in the new or old layers were mainly enriched in the iron oxide phase, and the enrichment ratios were 63.66%−69.51%, and also the residual phase ranged from 29.20% to 34.68% had an impact on PGE enrichment. Therefore, REE and PGE enrichment were presumed to the iron oxide colloid particles adsorption. In the marine oxidative environment, the soluble Ce³⁺ and Pt²⁺ were oxidized to insoluble Ce⁴⁺ and Pt⁴⁺ respectively, and the precipitates were adsorbed into the iron oxide phase, so REE and PGE were enriched in cobalt-rich crusts.
- the Pacific,
- cobalt-rich crusts,
- REE,
- PGE,
- occurrence phase

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