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2. ���ɹ�ɽ����ʿ���������޹�˾, ���ɹ� ��� 024000
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Characteristics of fluid inclusions and genesis of Weilasituo Pb-Zn deposit, Inner Mongolia
QUAN Hong-yan1, CAI Wen-yan1, ZHANG Xue-bing1, FU Li-juan2, WANG Ke-yong1
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Inner Mongolia Shandong Gold Geological Minerals Survey Co., Ltd, Chifeng 024000, Inner Mongolia, China
Abstract:

The Weilasituo deposit is mainly hosted in southern Great Hinggan Mountain metallogenic belt. The intrusive rocks exposed in the study area are mainly quartz diorite, granodiorite and alkali granite.Ore bodies are strictly controlled by fracture structures, which is an important character of the hydrothermal vein type lead-zinc deposit.The mineralization can be divided into ��, ��,�� stages, characterized by assemblages of quartz-arsenopyrite-pyrite, quartz-polymetallic sulfide and quartz-carbonate, respectively. Systematic study on fluid inclusions reveals that there existed three types of primary fluid inclusions in the ores, which were two-phase aqueous, CH4 rich and CH4-CO2 bearing fluid inclusions. All the three types of fluid inclusions were developed in stage ��. The primary fluid inclusions in stage �� were mainly composed of two-phase aqueous and CH4-CO2 bearing fluid inclusions, while only two-phase aqueous fluid inclusions were developed in stage ��. Homogenization temperatures of fluid inclusions in stage I ranged from 243.1�� to 398.5��, with salinities of 4.8%~12% NaCleqv. For stage ��, homogenization temperatures decreased to 190.0��~331.1��, salinities changed to 3.5%~9.1% NaCleqv, whereas for stage �� homogenization temperature was 180.0��~240.0��, with salinities of 3.7%~6.7% NaCleqv, indicating intermediate temperate and low salinity mineralizing liquids. The analytic results from Laser Laman Spectroscopy suggest that the gas phases are rich in CH4, CO2 and H2O. The analytic results from H and O isotope indicate that the mineralizing fluids were derived from magmatic water mixing with meteoric water. The study of S isotope implies that the ore forming materials were from a deep source. Combining all the analytical results and regional setting, it is concluded that Weilasituo deposit was related to the Yanshanian magmatism, and was formed by the precipitation of mineralizing materials in the west-east trending "S" shape compression fault during the mixing of magmatic water and meteoric water.

Keywords: fluid inclusion   stable isotope   Weilasituo   Great Hinggan Mountain  
�ո����� 2016-06-24 �޻����� 2017-01-03 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2017.01.009
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