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Geochemistry and source of platinum group elements in cobalt-rich crusts from Caiwei Seamounts in the western Pacific
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Jingjing Gao1, 2, Jihua Liu1, 2, Hui Zhang1, 2, Shijuan Yan1, 2, Hongmin Wang1, 2
Haiyang Xuebao | 2023, 45(4) : 82 - 94
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Haiyang Xuebao | 2023, 45(4): 82-94
• Article •
Geochemistry and source of platinum group elements in cobalt-rich crusts from Caiwei Seamounts in the western Pacific
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Jingjing Gao1, 2, Jihua Liu1, 2, Hui Zhang1, 2, Shijuan Yan1, 2, Hongmin Wang1, 2
Affiliations
  • 1Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
  • 2Laboratory for Marine Geology, Laoshan Laboratory, Qingdao 266237, China
Published: 2023-03-31 doi: 10.12284/hyxb2023039
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To explore the source of platinum group elements (PGE) in cobalt-rich crusts, the samples from Caiwei Seamounts in western Pacific were chosen as the research object, for which XRD, ICP-OES and ICP-MS were used to analyze the mineral composition, major elements contents and PGE contents in cobalt-rich crusts. The results showed that, the main crystalline minerals were vernadites in cobalt-rich crusts, and the minor minerals included quartz, plagioclase, potassium feldspar and carbon fluoride apatite. Also many amorphous ferric minerals were contained in cobalt-rich crusts. In addition, Mn and Fe contents were the highest in cobalt-rich crusts, and PGE were enriched in cobalt-rich crusts. PGE contents were 142−1352 ng/g, and Pt contents were 114−1268 ng/g, in which Pt accounted for more than 80%. PGE contents in the old layers were higher than that in the new layers. And the phosphatization appeared in the old crust layers. Moreover, there was an obvious contrast in PGE of cobalt-rich crusts, Pd group (PPGE) contents were more than Ir group (IPGE). PGE diagrams showed the positive Pt anomalies and negative Pd anomalies. And Pt was enriched and Pd was poor in cobalt-rich crusts. Meanwhile, PGE in cobalt-rich crusts were probably derived from the reaction between seamount basalt and seawater during the oceanic shell erosion process. PGE had positive correlation with CaO, P2O5, Ba and Cu, so PGE were probably enriched in the phosphate phase. In addition, the growth profile of cobalt-rich crust was from top to bottom and from new to old, PGE contents increased gradually. Therefore, oxidative marine environment and high marine productivity had a positive impact on phosphatization, which further promoted the enrichment of PGE. This study provided a certain reference value for revealing the source of PGE in cobalt-rich crusts.

the western Pacific  /  Caiwei Seamounts  /  cobalt-rich crusts  /  platinum group elements  /  geochemistry  /  source
Jingjing Gao, Jihua Liu, Hui Zhang, Shijuan Yan, Hongmin Wang. Geochemistry and source of platinum group elements in cobalt-rich crusts from Caiwei Seamounts in the western Pacific[J]. Haiyang Xuebao, 2023 , 45 (4) : 82 -94 . DOI: 10.12284/hyxb2023039
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Year 2023 volume 45 Issue 4
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Article Info
doi: 10.12284/hyxb2023039
  • Receive Date：2022-07-21
  • Online Date：2025-12-26
  • Published：2023-03-31
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  • Received：2022-07-21
  • Revised：2022-11-05
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    1Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
    2Laboratory for Marine Geology, Laoshan Laboratory, Qingdao 266237, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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