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Cobalt enrichment in a paleo-karstic bauxite deposit at Yunfeng, Guizhou Province, SW China TEXT SIZE: A A A

Cobalt can be enriched in a variety of different geologic settings, while it is mainly produced as a by-product of sediment-hosted stratiform Cu deposits and magmatic Ni-Cu deposits associated with mafic and ultramafic rocks. In this study, we report elevated Co concentrations in a paleo-karstic bauxite deposit at Yunfeng, Guizhou Province. Whole-rock chemical analyses indicate that Co is concentrated in carbonaceous ferruginous clay layers (167-962 ppm, average 383 ppm, n = 5) and siderite layers (47-439 ppm, average 213 ppm, n = 7) within the bauxite deposit. The positive correlation between Co and S, together with petrographic and EPMA analyses, suggests that Co occurs primarily as Co-rich/bearing sulfides/sulfoarsenides rather than cobaltiferous oxides/hydroxides as in most lateritic Ni-Co deposits. Many of the Co concentrations measured in this study are higher than the minimum grade (300 ppm) or cut-off grade (200 ppm) for economic exploitation of Co from sulfides or arsenides. Basing on these results, we put forward the scientific significance of Co enrichment in paleo-karstic environments and the potential importance of Co resources (as by-products of aluminum production) in bauxite deposits. 

Publication name

 ORE GEOLOGY REVIEWS Volume: 117 Article Number: 103308 DOI: 10.1016/j.oregeorev.2019.103308 Published: FEB 2020

Author(s)

 Long, Yongzhen; Lu, Anhuai; Gu, Xiangping; Chi, Guoxiang; Ye, Lin; Jin, Zhongguo; Zhang, Dongliang

Corresponding author(s) 

 LONG Yongzhen
 longyongzhen@csu.edu.cn
 -Cent South Univ, Key Lab Metallogen Predict Nonferrous Met & Geol, Minist Educ, Changsha 410083, Peoples R China.
 -Cent South Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China. 
 CHI Guoxiang
 guoxiang.chi@uregina.ca 
 Univ Regina, Dept Geol, Regina, SK S4S 0A2, Canada.

Author(s) from IGCAS   YE Lin

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