The Canadian Mineralogist ; 38 3: The Ulsan Fe—W mine is located surround by the Cretaceous Gyeongsang volcano-sedimentary basin at the southeastern edge of the Korean Peninsula. Distinct hydrothermal events resulted in calcic skarn and vein deposits in the field of recrystallized limestone near a Tertiary epizonal granite standard.
The deposits of the Ulsan mine present a unique opportunity to essay geochemically the complex development of a skarn—vein entity that is related heritably to a low-sulfidation scheme. Isochemical contact metamorphism of an early skarn mount stage I is displayed by the presence of anhydrous Ca—Al—Mg skarn minerals at the contact amid granite and recrystallized sandstone. These common sulfide assemblages are characterized by an overall low-sulfidation state mid the main skarn status.
Retrograde skarn stage III is characterized by minor impregnations of scheelite participate in calcite and quartz, and actinolite and chlorite.
The latest episode in the hydrothermal system stage IV is characterized by Zn—Pb—Ag mineralization in siderite—quartz veins. Decreasing As contents clothe in arsenopyrite from stages II to IV indicate a decrease in temperature or else sulfur fugacity or mutually with time.
The numerous skarn-forming events and ore minerals from various stages are interpreted to give birth to resulted from an evolutionary trend from hypersaline magmatic fluids during prograde skarn formation associated with Fe—As —Ni mineralization to low-salinity and low-temperature fluids while the retrograde skarn development, associated with W—Cu—Zn mineralization. Bollywood couple with big age difference in dating.
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