Econ. Environ. Geol. 2006; 39(5): 567-581

Published online October 31, 2006

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

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

Seon-Gyu Choi1*, Sang Joon Pak1, Sung Won Kim2, Chang Seong Kim1 and Chang-Whan Oh2

1Dept. of Earth & Environmental Sciences, Korea Univ., Seoul 136-713, Korea
2Dept. of Earth & Environmental Sciences, Chonbuk National Univ., Cheonju 561-756, Korea

Correspondence to :

Seon-Gyu Choi

seongyu@korea.ac.kr

Received: April 25, 2006; Accepted: August 1, 2006

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 165~145 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 110~45 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

Article

Econ. Environ. Geol. 2006; 39(5): 567-581

Published online October 31, 2006

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

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

Seon-Gyu Choi1*, Sang Joon Pak1, Sung Won Kim2, Chang Seong Kim1 and Chang-Whan Oh2

1Dept. of Earth & Environmental Sciences, Korea Univ., Seoul 136-713, Korea
2Dept. of Earth & Environmental Sciences, Chonbuk National Univ., Cheonju 561-756, Korea

Correspondence to:

Seon-Gyu Choi

seongyu@korea.ac.kr

Received: April 25, 2006; Accepted: August 1, 2006

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 165~145 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 110~45 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

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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