A mineralogical study of the skarn minerals from the Shinyemi lead-zinc ore deposits, Korea

新禮業鑛床의 스카른 鑛物은 1) 石榴石-輝石一金雲母-硅灰石 組合, 2) 石榴石-輝石 組合, 3) 石榴石-綠廉石 組合으로 區分된다. 이들 鑛物組合은 鑛石鑛物의 産出狀態, 鑛石鑛物의 種類 그리고 鑛化作用의 時期와 밀접한 關係가 있다. 石榴石結晶의 分析에 의하면 石榴石結晶의 累帶構造는 結晶의 成長時에 平衡條件의 變化에 기인한 化學的 累帶構造(chemical compositional zoning)이다. 그리고 鑛床의 生成環境과 關係火成岩의 位置를 스카른鑛物의 産出狀態와 스카른 鑛物中 石榴石의 化學成分의 검토에 의해 추정해 보았다.

Skarn silicates from the Shinyemi lead-zinc ore deposits can be distinguished as following three mineral assemblages: 1) garnet-pyroxene-phlogopite-wollastonite assemblages, 2) garnet-pyroxene assemblages, 3) garnet-epidote assemblages The assemblages are considered to be related with occurrences and kindes of ore minerals, and stage of mineralization in the deposits. Microprobe analyses of some garnets from the deposits show strong chemical zoning which is due to the changing equilibrium condition during growth of garnet crystal. Depositional condition of ore deposits and place of the ore-related, igneous rock are discussed in the light of chemical composition of garnet and occurence of skarns in the Shinyemi.