Volume 39 Issue 5
Sep.  2020
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Qiu Zhongrong, Ma Weilin, Yang Kehong. Characteristics and significance of platinum-group elements (PGEs) in polymetallic nodules from CCZ, East Pacific[J]. Bulletin of Geological Science and Technology, 2020, 39(5): 109-117. doi: 10.19509/j.cnki.dzkq.2020.0509
Citation: Qiu Zhongrong, Ma Weilin, Yang Kehong. Characteristics and significance of platinum-group elements (PGEs) in polymetallic nodules from CCZ, East Pacific[J]. Bulletin of Geological Science and Technology, 2020, 39(5): 109-117. doi: 10.19509/j.cnki.dzkq.2020.0509

Characteristics and significance of platinum-group elements (PGEs) in polymetallic nodules from CCZ, East Pacific

doi: 10.19509/j.cnki.dzkq.2020.0509
  • Received Date: 21 Aug 2019
  • The major, trace and platinum-group elements (PGEs) concentration of 20 polymetallic nodules obtained during the DY-45th Cruise from Clarion-Clipperton Zone (CCZ) of East Pacific were analyzed.The results show that the polymetallic nodules in the study area are basically mixed-type, and its total PGEs contents (ΣPGE) range from77.2×10-9 to 197×10-9, with an average of 136×10-9, which is significantly lower than that of hydrogenetic nodules in sea area of Cook Island (ΣPGE=306×10-9).The chondrite-normalized PGEs patterns of our study nodules are very similar to that of hydrogenetic nodules and cobalt-rich crusts, with all being characterized by positive Pt anomalies, gradual enrichment from Os to Pt and depletion from Pt to Pd.Combined with the characteristics of PGEs distribution in seawater and previous studies, it is suggested that PGEs in nodules should be derived directly from seawater.It is found that ΣPGE of polymetallic nodules in the study area are positively correlated with Fe and negatively correlated with Mn, but are positively correlated with Mn and negatively correlated with Fe in the sea area of Cook Island, indicating that the PGEs host-phases in different genetic nodules are different.PGEs in hydrogenetic nodules may mainly occur in manganese mineral phases, while mixed type-diagenetic nodules may mainly occur in iron mineral phases and the stronger the diagenesis is, the lower the ability of nodules is to enrich PGEs.

     

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