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Geological Occurrence and Mineralogy of Pyrophyllite Deposits in the Jinhae Area  

Kwack, Kyo-Won (Division of Earth Environmental Science System, College of Natural Sciences, Pusan National University)
Hwang, Jin-Yeon (Division of Earth Environmental Science System, College of Natural Sciences, Pusan National University)
Oh, Ji-Ho (Division of Earth Environmental Science System, College of Natural Sciences, Pusan National University)
Yoon, Keun-Taek (Division of Earth Environmental Science System, College of Natural Sciences, Pusan National University)
Chi, Sei-Jeong (Korea Institute of Geoscience and Mineral Resources, Mineral Resources Research Division)
Publication Information
Journal of the Mineralogical Society of Korea / v.22, no.2, 2009 , pp. 163-176 More about this Journal
Abstract
The pyrophyllite deposits located in Jinhae area have been studied through field observations and laboratory works including the X-ray diffraction (XRD), X-ray fluorescence (XRF), Electron probe microanalyzer (EPMA) and Inductively Coupled Plasma (ICP). The pyrophyllite deposits consist of mainly illite, dickite, pyrophyllite, diaspore, chlorite, pyrite and copiapite. According to the mineral assemblages, geological occurrences and alteration modes, the altered rocks can be classified into four types: Type A; quartz with silicifictaion, Type B; quartz + illite with illitization, Type C; quartz + dickite + illite with kaolin alteration, Type D; pyrophyllite + illite + dickite + diaspore with pyrophyllite alteraion. Rocks in Type A, which is generated by silicifictaion, have high $SiO_2$ contents more than 90 wt% and distinctive equigranular textures with microcrtstalline quartz. The pyrophyllites from the study area belong to 2M polytype. The host rocks of the pyrophyllite ore in this mine are rhyolitic rock, andecitic tuff and volcanic breccia. The alteration products seem to be controlled by the different lithology of the host rocks. The hydrothermal solution formed the deposits would be inferred to the acidic and have relatively high ionic activity of hydrogen and silica judging from alteration mineral assemblage. Pyrophyllite alteraion zone is generated by highest temperature condition of all alteration zone.
Keywords
pyrophyllite; diaspore; quartz zone; altered minerals; alteration zone; hydrothermal alteration;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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