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Base-metal Mineralization in the Cretaceous Gyeongsang Basin and Its Genetic Implications, Korea: the Haman-Gunbug-Goseong(-Changwon) and the Euiseong Metallogenic Provinces  

이상렬 (고려대학교 지구환경과학과)
최선규 (고려대학교 지구환경과학과)
소칠섭 (고려대학교 지구환경과학과)
유인창 (고려대학교 지구환경과학과)
위수민 (한국교원대학교 지구과학교육과)
허철호 (고려대학교 지구환경과학과)
Publication Information
Economic and Environmental Geology / v.36, no.4, 2003 , pp. 257-268 More about this Journal
Abstract
The Cretaceous magmatism in the Gyeongsang Basin, Korea, led to the formation of two contrasting metallogenic provinces: the Haman-Gunbug-Goseong(-Changwon) (HGGC) and the Euiseong (EU). The mineralization in the HGGC metallogenic province represents copper, gold and iron of porphyry-related deposits that display close relationships in time and space with subvolcanic granitoids. Much of copper-gold-forming events in this province are consistently constrained to the period between ca. 89 and 81 Ma. The hydrothermal systems of copper-gold vein deposits in the HGGC province are associated with ore-forming fluids of high to intermediate temperature (300∼50$0^{\circ}C$) with high salinity (20∼55 equiv. wt. % NaCl). The ore-forming fluids become progressively more diluted by the incorporation of decreased quantities of magmatic water further from the nearby intrusion, suggesting significant input and fluid mixing of a meteoric water component to the magmatic fluids during the late stage of geothermal systems. In contrast, the EU metallogenic province is characterized by polymetallic vein deposits that are consistently constrained to a period of 78∼60 Ma. The geothermal systems of polymetallic vein deposits in the EU province are derived from a narrow range of intermediate temperature (200∼40$0^{\circ}C$) with relatively low salinity(1∼7 equiv. wt.% NaCl). It may represent a mixed fluid of magmatic and meteoric waters. The base-metal mineralization in the Gyeongsang Basin shows a close spatial and temporal distinction between the proximal environment derived from shallow-level granitoids in the southwestern HGGC province and the distal condition derived from volcanic environments in the northwestern EU province.
Keywords
metallogenic province; Haman-Gunbug-Goseong(-Changwon); Euiseong; proximal type; transitional type; distal type;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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