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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (6): 779-785.doi: 10.11872/j.issn.1005-2518.2020.06.147

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Occurrence State and Ore-forming Regularity of Critical Metal Cobalt in the Changsha-Pingjiang Fault Zone，Northeastern Hunan Province

Zhilin WANG1(),Yang WU1,Deru XU2(),Shaohao ZOU2,Guojun DONG3,Erke PENG1,Juntao NING3,Bo KANG3   

  1. 1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring，Ministry of Education，School of Geosciences and Info-Physics，Central South University，Changsha 410083，Hunan，China
    2.State Key Laboratory of Nuclear Resources and Environment，East China University of Technology，Nanchang 330013，Jiangxi，China
    3.Team 402，Hunan Geology and Mineral Resources Exploration and Development Bureau，Changsha 410004，Hunan，China
  • Received:2020-08-07 Revised:2020-09-14 Online:2020-12-31 Published:2021-01-29
  • Contact: Deru XU E-mail:wangzhilin1025@163.com;xuderu@gig.ac.cn

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Abstract:

Recently，the exploration of cobalt resources in the Jingchong-Beishan area，the east of Changsha-Pingjiang fault zone，northeastern Hunan Province，has made great advances.Some Co （-polymetallic） vein deposits including the medium-size Jingchong Cu-Co polymetallic deposit and Hengdong Co-Cu deposit，and Dayan Au-Co occurrence were discovered in this region.Based on the detailed field observation，this study identified the ore stages，and concluded the metallogenic characteristics of Changsha-Pingjiang cobalt ore belt as well as the ore-forming factors.The combined microscopic observation and in-situ analytical methods revealed that the metal Co was mainly incorporated in fine-grained pyrite and arsenopyrite as stoichiometric substitution，with subordinate occurrence as independent mineral cobaltite.The complicated texture and chemical compositions of Co-beating pyrite and arsenopyrite indicated that pyrite associated with arsenopyrite has the higher Co concentration （up to 13.48%），greater than that in arsenopyrite-exclusive assemblages.Therefore，the mineral assemblage of fine-grained pyrite and arsenopyrite can be used as the mineral fingerprint to trace the high-grade Co ores during the prospecting exploration.Subsequently，the preliminary mineral processing technology was proposed.

Key words: critical metal cobalt, pyrite, arsenopyrite, cobaltite, Changsha-Pingjiang fault zone, occurrence state, northeast of Hunan Province

CLC Number: 

  • P618.51

Fig.1

Sketch map of regional geology and mineral resources distribution in northeastern Hunan Province[13]"

Fig.2

Geological map of the Hengdong Co-Cu deposit（a） and geological section of exploration line 32 of the Jingchong Cu-Co polymetallic deposit（b）[10,12]"

Fig.3

Ore types and the mineralogical characteristics of cobalt-bearing minerals in the Jingchong mining area，the Changsha-Pingjiang cobalt belt"

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