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Mesozoic Gold-Silver Mineralization in South Korea: Metallogenic Provinces Reestimated to the Geodynamic Setting  

Choi, Seon-Gyu (Dept. of Earth & Environmental Sciences, Korea Univ.)
Park, Sang-Joon (Dept. of Earth & Environmental Sciences, Korea Univ.)
Kim, Sung-Won (Dept. of Earth & Environmental Sciences, Chonbuk National Univ.)
Kim, Chang-Seong (Dept. of Earth & Environmental Sciences, Korea Univ.)
Oh, Chang-Whan (Dept. of Earth & Environmental Sciences, Chonbuk National Univ.)
Publication Information
Economic and Environmental Geology / v.39, no.5, 2006 , pp. 567-581 More about this Journal
Abstract
The Au-Ag lode deposits in South Korea are closely associated with the Mesozoic granitoids. Namely, the Jurassic deposits formed in mesozonal environments related to deep-seated granitoids, whereas the Cretaceous ones were developed in porphyry-related environments related to subvolcanic granitoids. The time-space relationships of the Au-Ag lode deposits in South Korea are closely related to the changing plate motions during the Mesozoic. Most of the Jurassic auriferous deposits (about $165{\sim}145$ Ma) show fluid characteristics typical of an orogenic-type gold deposits, and were probably generated in a compressional to transpressional regime caused by an orthogonal to oblique convergence of the Izanagi Plate into the East Asian continental margin. On the other hand, strike-slip faults and caldera-related fractures together with subvolcanic activity are associated with major strike-slip faults reactivated by a northward (oblique) to northwestward (orthogonal) convergence, and probably have played an important role in the formation of the Cretaceous Au-Ag lode deposits (about $110{\sim}45$ Ma) under a continental arc setting. The temporal and spatial distinctions between the two typical Mesozoic deposit styles in South Korea probably reflect a different thermal episodes (i.e., late orogenic and post-orogenic) and ore-forming fluids related to different depths of emplacement of magma due to regional changes in tectonic environment.
Keywords
Mesozoic; gold-silver; mineralization; metallogenic province; geodynamics;
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