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Hydrothermal fluid characteristics and genesis of Cu quartz veins in the Hwanggangri metallogenic district, Republic of Korea: Mineralogy, fluid inclusion and stable isotope studies

Citation

Yoo, BC and Brown, PE and White, N, Hydrothermal fluid characteristics and genesis of Cu quartz veins in the Hwanggangri metallogenic district, Republic of Korea: Mineralogy, fluid inclusion and stable isotope studies, Journal of Geochemical Exploration, 110, (3) pp. 245-259. ISSN 0375-6742 (2011) [Refereed Article]

Copyright Statement

2011 Elsevier B.V.

DOI: doi:10.1016/j.gexplo.2011.05.012

Abstract

The Pojeonri Cu quartz veins occur in the north-western portion of the Hwanggangri Metallogenic Province and consist of two parallel massive quartz veins that fill fractures oriented NW and NE along fault zones in Paleozoic metasedimentary and sedimentary rocks of the Ogcheon and Taebaeg belts. Based on the mineralogy and paragenesis of the veins, only one mineralization episode has been recognized. The ore minerals are mainly chalcopyrite, pyrrhotite, and pyrite with minor arsenopyrite, sphalerite, galena and oxides of those base metal minerals.Systematic studies of fluid inclusions in quartz veins found three types: CO2 -rich, H2O-CO2 , and aqueous inclusions. Hydrothermal fluids related to the mineralization are composed of 2O-CO2 CH4-NaCl fluids (400-2700bar, average 800 550bar) with Thtotal values of 263 to 443C and salinities less than about 18wt.% NaCl equiv. Ore minerals from the quartz veins were mainly deposited as a result of a decrease in sulfur fugacity caused by the separation of carbonic vapor from the parent H2O-CO2 CH4-NaCl fluids.The calculated and measured oxygen and hydrogen isotope compositions (δ18OH2O, δD) of the ore-forming fluids (9.5 to 12.6% SMOW, -87 to -80% SMOW, respectively) indicate that the hydrothermal fluids of the Pojeonri quartz veins were probably derived from mostly magmatic water or water that originated as a result of high temperature exchange between the igneous plutons and adjacent high -δ18O country rocks. Isotopic and fluid chemistry indicates that the Pojeonri veins and other polymetallic veins in this metallogenic district are genetically related to intrusions emplaced during the Cretaceous orogeny. Most features of the Pojeonri Cu quartz veins and the many polymetallic deposits in the Hwanggangri metallogenic district resemble features of districts hosting porphyry W-Mo deposits of Climax-type.

Item Details

Item Type:Refereed Article
Keywords:Cu quartz vein, mineralogy, fluid inclusion, stable isotope, porphyry WMo deposits
Research Division:Earth Sciences
Research Group:Geology
Research Field:Mineralogy and Crystallography
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Mineral Exploration not elsewhere classified
Author:White, N (Professor Noel White)
ID Code:119400
Year Published:2011
Web of Science® Times Cited:6
Deposited By:Geography and Spatial Science
Deposited On:2017-08-01
Last Modified:2017-09-22
Downloads:0

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