Geochemical Environments of Copper-bearing Ore Mineralization in the Haman Mineralized Area

서지정보

· 발행기관 : 대한자원환경지질학회
· 수록지 정보 : 자원환경지질 / 42권 / 1호 / 1 ~ 8페이지
· 저자명 : 최상훈

초록

The Haman mineralized area is located within the Cretaceous Gyeongsang Basin along the southeastern part of the Korean peninsula. Almost all occurrences in the Haman area are representative of copper-bearing polymetallic hydrothermal vein-type mineralization. Within the area are a number of fissure-filling hydrothermal veins which contain tourmaline,
quartz and carbonates with Fe-oxide, base-metal sulfide and sulfosalt minerals. The Gunbuk, Jeilgunbuk and Haman mines are each located on such veins. The ore and gangue mineral paragenesis can be divided into three distinct stages: Stage I, tourmaline + quartz + Fe-Cu ore mineralization; Stage II, quartz + sulfides + sulfosalts + carbonates; StageIII, barren calcite. Equilibrium thermodynamic data combined with mineral paragenesis indicate that copper minerals precipitated mainly within a temperature range of 350℃ to 250℃. During early mineralization at 350℃, significant amounts
of copper (103 to 102 ppm) could be dissolved in weakly acid NaCl solutions. For late mineralization at 250℃, about 100 to 10-1 ppm copper could be dissolved. Equilibrium thermodynamic interpretation indicates that the copper in the Haman-Gunbuk systems could have been transported as a chloride complex and the copper precipitation occurred as a result of cooling accompanied by changes in the geochemical environments ( fs2, fo2, pH, etc.) resulting in decrease of solubility of copper chloride complexes.

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