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Predictive Exploration of the Cretaceous Major Mineral Deposits in Korea : Focusing on W-Mo Mineralization
한국 백악기 주요 금속광상의 예측 탐사 : W-Mo 광화작용을 중심으로
Econ. Environ. Geol. 2019 Oct;52(5):323-36
Published online October 31, 2019;  https://doi.org/10.9719/EEG.2019.52.5.323
Copyright © 2019 the Korean society of economic and environmental gelology.

Seon-Gyu Choi*, Jeonggeuk Kang and Jong Hyun Lee
최선규* · 강정극 · 이종현

Department of Earth and Environmental Sciences, Korea University, Seoul 02841, Korea
고려대학교 지구환경과학과
Received July 9, 2019; Revised September 30, 2019; Accepted September 30, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
The Mesozoic activity on the Korean Peninsula is mainly represented by the Triassic post-collisional, Jurassic orogenic, and Cretaceous post-orogenic igneous activities. The diversity of mineralization by each geological period came from various geothermal systems derived from the geochemical characteristics of magma with different emplacement depth. The Cretaceous metallic mineralization has been carried out over a wide range of time periods from ca. 115 to 45 Ma (main stage; ca. 100 to 60 Ma) related to post-orogenic igneous activity, and spatial distribution patterns of most metal deposits are concentrated along small granitic stocks. The late Cretaceous metal deposits in the Gyeonggi and Yeongnam massifs are generally distributed along the boundary among the Gongju- Eumseong fault system and the Yeongdong-Gwangju fault system and the Gyeongsang Basin, most of them are in the form of a distal epithermal~mesothermal Au-Ag vein or a transitional mesothermal Zn-Pb-Cu vein. On the other hand, diverse metal commodities in the Taebaeg Basin, the Okcheon metamorphic belt and the Gyeongsang Basin are produced from various deposit types such as skarn, carbonate-replacement, vein, porphyry, breccia pipe, and Carlin type. In the late Cretaceous metallic mineralization, various mineral deposits and commodities were induced not only by the pathway of the hydrothermal solution, but also by the diversity of precipitation environment in the proximity difference of the granitic rocks. The diversity of these types of Cretaceous deposits is fundamentally dependent on the geochemical characteristics such as degree of differentiation and oxidation state of related igneous rocks, and ore-forming fluids generally exhibit the evolutionary characteristics of intermediate- to low-sulfur hydrothermal fluids.
Keywords : Cretaceous, mineralization, metallogenic epoch, Hwanggangri, predictive exploration

 

December 2019, 52 (6)