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The fluid inclusion characteristics and metallogenic mechanism of Dashui gold deposit in Gansu Province, China

, : The fluid inclusion characteristics and metallogenic mechanism of Dashui gold deposit in Gansu Province, China. Mineralogical Magazine 75.3: 1618

Dashui Gold Deposit in Maqu, Gansu found in west Qinling mountain area is a gold deposit with extra unique mineralization characteristics. Ore bodies mainly outcrop in the hematitization silicified limestone, hematitization silicified granodiorite and their contact zone. The ores are red, brown and very poor in sulfides. Hydrothermal calcite veins within the mining area are well developed. They are closely associated with gold mineralization temporally and spatially, and often constituting the roof and floor of ore bodies. According to the calcite veins' spatial output form, crystal habits and the relationship with gold mineralization, the process can be divided into three stages, and the calcite from second stage is closely related to mineralization. In this research there were total 12 inclusion samples collected, two calcite samples from first stage, seven from second stage and three from the third stage. The inclusion characteristics of Dashui Gold Deposit indicate that ore-forming temperature is bounded up with metallogenic depth. The maximum metallogenic depth in 3490 m middle section is 0.59 km with a maximum ore-forming temperature 370.1 degrees . The metallogenic depth of 3530 m middle section is low. There are two samples collected from 0.29 km and 0.30 km separately with low ore-forming temperatures 168.2 degrees and 168.3 degrees of each other. This indicates that the the ore-forming fluid was upward migrating from the depth. Regionally the ore-forming temperature of fluid is decreasing from east to west. The average homogeneous temperature of east zone is 240.66 degrees , the general temperature are 217.4 degrees , 243.7 degrees and 276.3 degrees . The west zone's is decreasing to 174 degrees , showing that the migration of ore-forming fluid was from east to west. The ore-forming temperature can be divided into three intervals: 370.1 degrees , 217.4 degrees -276.3 degrees and 168.2 degrees -174 degrees , which can also stand for three metallogenic stages.


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