Systematic mineralization in Taebaeksan mineralized district: Proximity of hydrothermal deposit to porphyry

Title
Systematic mineralization in Taebaeksan mineralized district: Proximity of hydrothermal deposit to porphyry
Author(s)
박상준; 최선규; 김창성; 최선기
KIOST Author(s)
Pak, Sang Joon(박상준)Choi, Sun Ki(최선기)
Alternative Author(s)
박상준; 최선기
Publication Year
2018-04-18
Abstract
The Taebaeksan mineralized district, one of the large mining areas in Korea, includes various type of deposits such like the hydrothermal Au-Ag deposits, polymetallic W-Mo, Fe-Cu and/or Pb-Zn skarn deposits, replacement deposits and Carlin-like deposits. The deposits are mainly hosted by Paleozoic sedimentary rocks and/or Precambrian gneiss. Mineralization age of hydrothermal Au-Ag mineralization show ca. 94-72 Ma, contemporaneous with the age of polymetallic deposits ca. 98-70 Ma. In particular, most of polymetallic deposits and several hydrothermal Au-Ag deposits in the district are spatially related to each others, coinciding with late Cretaceous Bulgugsa event (ca. 108-74 Ma) which is featured by the subvolcanic activity. Hydrothermal Au-Ag deposits in the area display multiple complex veins with abundance of Pb-Zn base-metal sulfides (up to 30% in ore) and a wide range of Ag/Au ratios. In particular, Au-dominant deposits such as the Samjo and Dunjeon deposits and polymetallic skarn deposits (e.g. the Geodo and Sangdong deposits) would be spatially related to subvolcanic granitoid stocks, showing proximal-type environment. Proximal-type deposits have the relatively high formation temperature (ca. 410˚-200℃) from high saline hydrothermal fluids (< 52 wt. % NaCl). The ore-forming fluids of the proximal type likely originated in fluids less effected by meteoric waters, i,e., the relatively magmatic waters (calculike deposits. The deposits are mainly hosted by Paleozoic sedimentary rocks and/or Precambrian gneiss. Mineralization age of hydrothermal Au-Ag mineralization show ca. 94-72 Ma, contemporaneous with the age of polymetallic deposits ca. 98-70 Ma. In particular, most of polymetallic deposits and several hydrothermal Au-Ag deposits in the district are spatially related to each others, coinciding with late Cretaceous Bulgugsa event (ca. 108-74 Ma) which is featured by the subvolcanic activity. Hydrothermal Au-Ag deposits in the area display multiple complex veins with abundance of Pb-Zn base-metal sulfides (up to 30% in ore) and a wide range of Ag/Au ratios. In particular, Au-dominant deposits such as the Samjo and Dunjeon deposits and polymetallic skarn deposits (e.g. the Geodo and Sangdong deposits) would be spatially related to subvolcanic granitoid stocks, showing proximal-type environment. Proximal-type deposits have the relatively high formation temperature (ca. 410˚-200℃) from high saline hydrothermal fluids (< 52 wt. % NaCl). The ore-forming fluids of the proximal type likely originated in fluids less effected by meteoric waters, i,e., the relatively magmatic waters (calcu
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23429
Bibliographic Citation
2018 춘계 지질과학기술 공동 학술대회, pp.195, 2018
Publisher
대한자원환경지질학회
Type
Conference
Language
English
Publisher
대한자원환경지질학회
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