화절층내 석회질 團塊의 스카른화와 深部潛頭 광체와의 관계

Relation of the skarnized calcareous nodules in the Hwajeol formation and the deep concealed orebody

It is observed that calcareous nodules of the Hwajeol Formation are locally skarnized in the Sangdong district, in which the skarn mineralization extends 5 Km westward from the Sangdong mine area to the Hwajeolchi area. After a hidden granite beneath the Sangdong mine was discovered by exploration drillings, the exploration teams of the Sangdong mine and the Korean Mining Promotion Corporation have assumed that the skarn nodule of the Hwajeol Formation was derived from emplacement of a granite in deep place and the occurrence of hidden ore bodies below the skarn, and they have discovered high grades of tungsten orebody in the same horizon of the Sangdong ore body. Mutual genetie relatioships between epidote and garnet may be explained by following chemical reactions Ca₂FeA₁₂ Si₃O₁₂(OH)+CaCO₃=Ca₃(Fe, Al)₂ SiO₁₂+1/2CO₂+1/2H+Ca₃FeSi₃O₁₂+SiO₂+CO₂=2CaFeSi₁₂O₆+CaCO₃+1/2O₃. It is concluded that epidote and garnet are useful as target minerals indicating a potential occurrence of deep seated hidden ore body. Since the epidote may inform the emplacement of the granite, while the garnet in the skarn nodule of the Hwajeol Formation may reflect a strong hydrothermal mineralization taking place from the depth.