Fluid Inclusion Study of the Weilasituo Cu Polymetal Deposit in Inner Mongolia

Abstract

Abstract:

The studies on geologic characteristics，fluid inclusion，H and O isotopes of the Weilasituo Cu polymetal deposit showed that mineralization had experienced many stages. Based on cross-cutting relationship of veins and ore structure，four stages can be identified：quartzpyrite stage，polymetallic sulfide stage，chalcopyrite-pyrrhotite-quartz stage and quartz-carbonate stage. There are four types of the fluid inclusions：liquid-rich inclusion，gas-rich inclusion, polyphase inclusion bearing daughtermineral crystals and CO₂ three-phase inclusion. The fluid inclusions are oval or nearly round in shape，which are of majority and distributed disorderedly. The homogenized temperatures and salinity are from 106 ℃ to 389 ℃, and 1.23% to 9.86% NaCl eqv, respectively, which indicate characters of intermediate temperature，low salinity and low density for the fluid. The analytic results through Laster Laman Spectroscopy suggest that the fluid is rich in CH₄，CO₂ and H2O. The analytic results from H and O isotopes implied that the mineralizing fluids originated from magmatic water and accompanied with participation of meteoric water. It is concluded that the Weilasituo Cu polymetal deposit was formed by the precipitation of mineralizing materials in advantaged structures. It is an intermediate temperature hydrothermal polymetal type related to the Yanshanian magmatism.

Key words: fluid inclusion;hydrothermal;Cu polymetal deposit;Weilasituo, Inner Mongolia

CLC Number:

P618.41
P59

WANG Jin, HOU Qing-Ye, CHEN Yue-Long, LIU Jin-Bao, WANG Zhong. Fluid Inclusion Study of the Weilasituo Cu Polymetal Deposit in Inner Mongolia[J]. Geoscience, 2010, 24(5): 847-855.

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