Occurrence phase and enrichment mechanism of platinum group elements in the Pacific cobalt-rich crusts

Gao Jingjing; Liu Jihua; Zhang Hui; Yan Shijuan; He Lianhua; Wang Xiaojing; Wang Hongmin

doi:10.3969/j.issn.0253-4193.2019.08.011

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Gao Jingjing，Liu Jihua，Zhang Hui, et al. Occurrence phase and enrichment mechanism of platinum group elements in the Pacific cobalt-rich crusts[J]. Haiyang Xuebao，2019, 41(8)：115–124，doi:10.3969/j.issn.0253−4193.2019.08.011

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Occurrence phase and enrichment mechanism of platinum group elements in the Pacific cobalt-rich crusts

doi: 10.3969/j.issn.0253-4193.2019.08.011

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

1.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China

Received Date: 2018-12-04
Rev Recd Date: 2019-04-09

Available Online: 2021-04-21

Publish Date: 2019-08-25

Abstract

Abstract

Selective chemical extraction method was utilized to fractionally extract platinum group elements (PGE) in cobalt-rich crusts from Caiwei Seamount in the Pacific, and PGE contents were determined by inductively coupled plasma mass spectrometry (ICP-MS). Occurrence phase analysis results in cobalt-rich crusts show that the PGE enrichments in different phases conform to the following order: iron oxide phase, residual phase, manganese oxide phase, carbonate phase, adsorbed phase. PGE in the new non-phosphate layers and the old phosphate layers are mainly enriched in the iron oxide phase, with the enrichment ratio from 59.26% to 82.19%, and the phosphate in residual phase has certain enrichment ability for PGE, with the enrichment ratio from 17.23% to 35.37%. Meanwhile, occurrence phase analysis results in different geological bodies show that the PGE enrichment in cobalt-rich crusts and seamount nodules is mainly affected by iron oxide phase and residual phase. In addition, the enrichment mechanism of PGE in cobalt-rich crusts is presumed to the iron oxide/iron hydroxides colloid particles adsorption, and the soluble $ {\rm PtCl}_4^{2-}$ in seawater is adsorbed into the iron oxide phase, so PGE are enriched in cobalt-rich crusts.
- cobalt-rich crust,
- platinum group elements (PGE),
- occurrence phase,
- enrichment mechanism,
- chemical extraction

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References(36)

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