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Physicochemical Environment during the Formation of the Mozumi Skarn‐type Pb–Zn–Ag Deposit at the Kamioka Mine, Central Japan: A Thermochemical Study
Author(s) -
OMORI Soichi,
MARIKO Tadashi
Publication year - 1999
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.1999.tb00048.x
Subject(s) - skarn , epidote , andradite , geology , grossular , mineral , mineralogy , silicate , geochemistry , paragenesis , fluid inclusions , chlorite , chemistry , metamorphic rock , metallurgy , materials science , paleontology , quartz , organic chemistry
The physicochemical environment during the ore formation of the Mozumi skarn‐type Pb–Zn–Ag deposit, Kamioka mine, Central Japan is discussed with silicate phase equilibria using calculated phase diagrams. The mineral assemblages, mineral chemistry, and fluid inclusion data are coupled with thermodynamic calculation to estimate the stability fO2–XCO2condition of the mineral assemblages at each ore formation stage. The skarn was approximated by the model system CaO–A12O3–FeO–SiO2–O2–CO2–H2O including grossular‐andradite garnet and clinozoisite‐epidote solid solutions. The solid solutions are combined into the calculation using “pseudocompound approximation”, and real boundary of the mineral assemblages other than simple activity corrected diagram was provided. The diagrams also show isoplethal contour for garnet and epidote.