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Hidden Porphyry-Related Ore Potential of the Geumseong Mo Deposit and Its Genetic Environment  

Choi, Seon-Gyu (Dept. of Earth & Environmental Sciences, Korea Univ.)
Park, Jung-Woo (Dept. of Earth & Environmental Sciences, Korea Univ.)
Seo, Ji-Eun (Dept. of Earth & Environmental Sciences, Korea Univ.)
Kim, Chang-Seong (Dept. of Earth & Environmental Sciences, Korea Univ.)
Shin, Jong-Ki (Korea Resources Corporation)
Kim, Nam-Hyuck (Korea Resources Corporation)
Yoo, In-Kol (Korea Resources Corporation)
Lee, Ji-Yun (Dept. of Earth & Environmental Sciences, Korea Univ.)
Ahn, Yong-Hwan (Dept. of Earth & Environmental Sciences, Korea Univ.)
Publication Information
Economic and Environmental Geology / v.40, no.1, 2007 , pp. 1-14 More about this Journal
Abstract
The Guemseong mine is located near the southern margin of the Jurassic Jecheon granitoids collectively with the Cambro-Ordovician mixed dolostone-limestone series of the Yeongweol Group, Choseon Supergroup. Here, two spatially distinct types of skarn formation have been observed. The upper transitional skarn is the calcic Mo skarn which has the mineral assemblage of $garnet+hedenbergite+epidote{\pm}wollastonite{\pm}magnetite{\pm}hematite{\pm}amphibole{\pm}chlorite{\pm}vesuvianite$ within the calcite marble. On the other hand, the lower proximal skarn occurs as a discordant magnesian Fe skarn at the contact of Mo-bearing aplitic cupolas with unidirectional solidification texture(UST) within the dolomitic marble. The magnesian Fe skarn has the mineral assemlage $olivine+diopside+magnetite+tremolite+serpentine+talc+chlorite{\pm}phlogopite$. The formation of two different types of skarn and ore mineralization in Geumseong mine have been attributed to multistage and complex metasomatic replacements that ultimately resulted in silicate-oxide-sulfide sequence of metasomatism. An early prograde stage with anhydrous skarn minerals such as olivine, clinopyroxene and/or garnet with magnetite, formed from high temperature (about $500^{\circ}\;to\;400^{\circ}C$) at an environmental condition of low $CO_2$ fugacity ($XCO_2<0.1$) and 0.5 kbar. The later retrograde stage with hydrous silicates such as amphibole, serpentine, phlogopite, epidote and chlorite with molybdenite or hematite, termed from relatively lower temperature (about $400^{\circ}\;to\;300^{\circ}C$).
Keywords
Calcic skarn; magnesian skarn; Geumseong; porphyry-style Mo mineralization; unidirectional solidification texture(UST);
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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