무주 수왕광산에서 산출되는 섬아연석의 황동석 병변에 관한 연구 = Chalcopyrite Disease in Sphalerite: A Case of the Soowang Ore Deposits in Muju, Republic of Korea

다국어 초록 (Multilingual Abstract)

The Soowang deposits occur in the quartz veins that were filled fissures in the middle Cretaceous porphyritic granite and/or the Precambrian Sobaegsan gneiss complex. Paragenetic studies suggest that the vein filling can be divided into four identifiable stages. Sphalerites were deposited by the cooling fluids at stages Ⅰ, Ⅱ, and Ⅲ. The results of microscopic observation and EPMA analysis suggest that the chalcopyrite dots and disease in sphalerite are replacement products by later hydrothermal solution at the early stage Ⅲ. The inferred processes of chalcopyrite disease are as follows : (1) Fe enrichment to the margins and along the cracks of the Fe-poor sphalerite by Fe-rich solution, (2) Formation of chalcopyrite dots in the Fe-enriched sphalerite formed at the stage Ⅱ, and Fe reduction of sphalerite near the chalcopyrite dots by Cu-bearing solution, (3) Formation of "chalcopyrite disease" penetrating the compositional zoning of sphalerite at the early stage Ⅲ.

국문 초록 (Abstract)

수왕광상은 중생대 백악기 중기의 반상화강암이나 선캄브리아기의 소백산 편마암 복합체에 발달한 열극을 충진한 석영맥에서 산출된다. 광물 공생군에 대한 연구 결과 광화작용은 4차례에 걸쳐 일어났다. 섬아연석은 광화작용이 진행되는 동안 광화Ⅰ, Ⅱ, Ⅲ기에 각각 정출하였다. 현미경 관찰과 전자현미분석 결과 섬아연석에서 나타나는 황동석 점적과 황동석 병변은 광화 Ⅲ기 초에 열수용액의 교대작용에 의하여 생성되었을 것으로 생각된다. 황동석 병변의 생성 과정은 아래와 같다. (1) Fe가 풍부한 용액이 Fe가 결핍된 섬아연석의 가장자리나 틈을 통해 Fe 부화 (2) 광화Ⅱ기에 Fe가 결핍된 섬아연석에 황동석 점적을 형성하고 Cu를 함유한 용액에 의해 황동석 점적 주변의 섬아연석에 Fe 감소 (3) 광화Ⅲ기 초에 황동석 병변을 형성하였다.

참고문헌 (Reference)

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