Fluid Inclusions of Quartz-vein Group in the Bainaimiao Area, Inner  Mongolia, and Its Significance in Exploring Gold Mineralization

Abstract

Abstract:

The study area is located in a Cu-Au metallization belt in Bainaimiao-Gunawusu, Inner Mongolia. A set of quartz-vein group is found in the Xuniwusu Formation by recent geological mapping, distributing in the Shiertai area, west of Bainaimiao Cu-Au deposit, but exhibiting a large similarity with the gold metallization veins of Bainaimiao Cu-Au deposit. The mineral assemblage of the quartz-vein group can be divided into two stages: the early pyritequartz stage （M1） and the late quartz-calcite stage （M2）. In M1 stage, homogenization temperature of the three phase inclusion bearing daughter crystal is of 256-320 ℃, and salinity of 31.4%-39.8% NaCl_eqv. Homogenization temperature of the two-phase aqueous inclusion is of 210-260 ℃, and salinity of 17.1%-22.8% NaCl_eqv, and CH₄ enriched, less CO₂, H₂O , and small amount of H₂S, C₆H₆, N₂at gas phase composition; whereas by temperature of 170-210 ℃, CO₂ or H₂O enriched, less CH₄, and minor N₂, the salinity is as much as that of the former, but with participation of low salinity end-member. The CH₄ and CO₂ or only CH₄ is shown by the pure gas inclusion. In M2 stage, homogenization temperature of two-phase aqueous inclusions is of 90-160 ℃, salinity of 15.82%-21.1% NaCl eqv, and the two-phase aqueous inclusion has a mixture with low salinity fluid. It is proposed that fluids of quartzvein group should be regarded as aCH₄-CO₂-H₂O-NaClsystem in the low salinity and low temperature with a small amount of H₂S and N₂, C₆H₆. In comparison with gold ore-forming fluid, fluid inclusion of Bainaimiao Cu-Au deposit, and data of chemical analysis of quartz-vein group, we suggest that the quartz-vein group would be a potential exploration target of gold metallization.

Key words: fluid inclusion, gold mineralization, quartz-vein group, Bainaimiao-Gunawusu, Inner Mongolia

CLC Number:

P618.51

WANG Bi-Lin,ZHOU Zhi-Guan,YU Yang-Sen,NA Fu-Chao,XIAO Ru-Feng. Fluid Inclusions of Quartz-vein Group in the Bainaimiao Area, Inner Mongolia, and Its Significance in Exploring Gold Mineralization[J]. Geoscience, 2011, 25(2): 243-252.

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Fluid Inclusions of Quartz-vein Group in the Bainaimiao Area, Inner Mongolia, and Its Significance in Exploring Gold Mineralization

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