Application of Microbeam Analytical Technology to Study the Occurrence of Cobalt from Copper-Cobalt Deposits

TU Jiarun; LU Yiguan; SUN Kai; ZHOU Hongying; GUO Hu; CUI Yurong; GENG Jianzhen; LI Guozhan

doi:10.15898/j.cnki.11-2131/td.202112060194

Rock and Mineral Analysis > 2022 > 41(2): 226-238. > DOI: 10.15898/j.cnki.11-2131/td.202112060194

TU Jiarun, LU Yiguan, SUN Kai, ZHOU Hongying, GUO Hu, CUI Yurong, GENG Jianzhen, LI Guozhan. Application of Microbeam Analytical Technology to Study the Occurrence of Cobalt from Copper-Cobalt Deposits[J]. Rock and Mineral Analysis, 2022, 41(2): 226-238. DOI: 10.15898/j.cnki.11-2131/td.202112060194

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Application of Microbeam Analytical Technology to Study the Occurrence of Cobalt from Copper-Cobalt Deposits

TU Jiarun^{1, 2,},
LU Yiguan^{1, 2, 3},
SUN Kai^{1, 2, 3},
ZHOU Hongying^{1, 2},
GUO Hu^{1, 2},
CUI Yurong^{1, 2},
GENG Jianzhen^{1, 2},
LI Guozhan^{1, 2}

1.
Tianjin Center, China Geological Survey, Tianjin 300170, China
2.
North China Center for Geoscience Innovation, China Geological Survey, Tianjin 300170, China
3.
Eastern and Southern Africa Geosciences Cooperation Research Center, China Geological Survey, Tianjin 300170, China

More Information

Received Date: December 05, 2021
Revised Date: January 07, 2022
Accepted Date: January 26, 2022
Available Online: February 20, 2024

Abstract

ABSTRACT

BACKGROUND
Microbeam analytical technology can be used to accurately analyze the petrography, morphology, structure, component and isotopic composition of ore minerals on the micro-nano scale, which plays a vital role in supporting the detailed research of geoscience.
OBJECTIVES
To provide a practical technology for visually and quickly identifying the cobalt-bearing minerals and to understand the occurrence of cobalt in the Chambishi copper-cobalt deposit.
METHODS
Microscopy was combined with microbeam analytical technologies of micro-XRF, EPMA, LA-ICP-MS to develop a method for quickly identifying the cobalt-bearing minerals from copper-cobalt deposits. First, representative thin sections were selected by polarized light microscopy, micro-XRF map scanning was then used to obtain the distribution characteristics of cobalt and combined elements in the thin sections. The polarized light microscopy was used again to identify independent cobalt minerals and cobalt-bearing minerals based on the characteristics of element distribution. Finally, the representative minerals were circled and the main and trace elements were determined by EPMA and LA-ICP-MS.
RESULTS
The results showed that in the Chambishi Southeast orebody the cobalt not only existed in the form of independent minerals (pentlandite, linnaeite, carrollite), but also occurred in pyrite and pyrrhotite in the form of isomorphism, while the cobalt in the Chambishi West orebody mainly existed in the form of independent mineral—carrollite with a small amount.
CONCLUSIONS
The combined microbeam analysis method is proposed to quickly and easily identify cobalt-bearing minerals and to study the occurrence of cobalt in the Chambishi Southeast orebody and Chambishi West orebody. It can effectively save the time of identifying minerals by traditional polarized light microscopy and avoid missing identification of some independent cobalt minerals or cobalt-bearing minerals with small particle size or without obvious optical characteristics.
- microbeam analysis,
- occurrence state,
- copper-cobalt deposits,
- mapping,
- micro-XRF,
- LA-ICP-MS

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要点

HIGHLIGHTS

(1) A microbeam analytical technology was proposed to easily, visually and quickly identify the occurrence of cobalt from copper-cobalt deposits.

(2) Relative positions of cobalt-bearing minerals can be quickly and directly identified according to the distribution of the cobalt element and combined elements by micro-XRF mapping.

(3) Two cobalt forms, independent minerals and isomorphism were discovered in the Chambishi Southeast orebody, while only a small number of independent cobalt mineral (carrollite) was found in the Chambishi West orebody.

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