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http://dx.doi.org/10.9727/jmsk.2016.29.3.141

Skarnization and Fe Mineralization at the Western Orebody in the Manjang Deposit, Goesan  

Lim, Euddeum (Department of Geoenvironmental Sciences, Kongju National University)
Yoo, Bongchul (Mineral Resources Department, Korea Institute of Geoscience and Mineral Resources)
Shin, Dongbok (Department of Geoenvironmental Sciences, Kongju National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.29, no.3, 2016 , pp. 141-153 More about this Journal
Abstract
The Manjang deposit is emplaced in Hwajeonri formation comprising limestone that is interbeded with slate and phyllite in the central Okcheon Group. It consists of the Main and the Central orebody of Cu-bearing hydrothermal vein deposit and the Western orebody of iron skarn deposit. Based on coexisting mineral assemblage the skarnization can be divided into prograde skarnization (stage I : clinopyroxene ${\pm}$ magnetite ${\pm}$ quartz, stage II : garnet + clinopyroxene ${\pm}$ magnetite ${\pm}$ quartz) and retrograde hydrothermal alteration (stage III: magnetite + amphibole + quartz ${\pm}$ garnet ${\pm}$ clinopyroxene ${\pm}$ chlorite ${\pm}$ epidote ${\pm}$ fluorite ${\pm}$ calcite, stage IV: fluorite ${\pm}$ pyrrhotite ${\pm}$ chalcopyrite ${\pm}$ amphibole ${\pm}$ quartz ${\pm}$ calcite). Diopside is abundant in stage I, and hedenbergite was produced in stage II and III. Garnet compositions change from grandite to andradite, which suggests a redox transition from relatively reduced to oxidized condition during the skarn formation. Magnetite in stage I and II has relatively constant Fe contents, while in the stage III it has increased Si and Ca concentrations. This variation could indicate that magnetite was more strongly affected by host rocks during the retrograde stage. Sulfur isotope compositions of pyrrhotite and chalcopyrite produced in stage IV are within the range of + 5.9~6.9 ‰, corresponding to igneous origin, but slightly high sulfur isotope values could be attributed to an interaction with host rocks, limestone.
Keywords
Skarn; Fe-mineralization; Magnetite; Sulfur stable isotope; Manjang deposit;
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Times Cited By KSCI : 5  (Citation Analysis)
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