Mineralogy and Genesis of Manganese Ores from the Eosangcheon Mine, Korea

어상주광산(魚上川鑛山)의 망간광석(鑛石)에 대(對)한 광물학적(鑛物學的) 및 성인적연구(成因的硏究)

  • Kim, Soo Jin (Department of Geological Sciences, Seoul National University) ;
  • Kim, Seong Hoon (Department of Geological Sciences, Seoul National University)
  • 김수진 (서울대학교 자연과학대학 지질과학과) ;
  • 김성훈 (서울대학교 자연과학대학 지질과학과)
  • Published : 1982.12.31


The Eosangcheon manganese ore deposits occur as supergene weathering deposits along quartz porphyry dikes developed in the Ordovician Heungweolri dolomite and Samtaesan limestone formations. The manganese ores are composed of manganese oxide minerals and associated other minerals. Rancieite and todorokite are abundantly found, and birnessite, nsutite, pyrolusite and chalcophanite are found in minor quantities. Associated other minerals are calcite, gypsum, goethite, lepidocrosite, quartz, and sericite. Microscopic, chemical, X-ray powder diffraction, infrared absorption spectroscopic and differential thermal analyses have been made for manganese oxide minerals and associated other minerals. The relationship of birnessite and rancieite was studied by means of X-ray powder diffraction and infrared absorption spectroscopic analyses. It is assumed that these minerals are closely related to each other in crystal structure, but separate species. The manganese oxide minerals were formed mainly by replacement, precipitation from solution, and recrystallization in the supergene weathering environment. The trend of formation of manganese oxide minerals is: (Rhodochrosite)-(todorokite)-(birnessite, rancieite)-(nsutite, pyrolusite, chalcophanite).