科研之友
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摘要
The Bandiersirehong iron-copper polymetallic deposit located in northwestward of West Kunlun orogenic belt. Cu-Fe mineralization controlled by skarn occurs in the contact zone between the granodiorite and carbonates. The granodiorite is spatially and temporally related to mineralization. In this study, we performed LA-ICP-MS zircon U-Pb dating analyses on the Bandiersirehong granodiorite closely related to Cu-Fe mineralization for the first time. Seventeen zircons from granodiorite sample yield excellent concordia results with a weighted mean Pb-206/(238) U age of 239.8 +/- 1.5Ma, which shows that the deposit formed in the Early-Middle Triassic. According to crosscutting relationships and minerals assemblages, the hydrothermal ore-forming process in the Bandiersirehong deposit can be divided into four stages: prograde stage, retrograde stage, quartz-sulfide stage, carbonate stage. Quartz-sulfide stage is the main mineralization stage with numerous fine veins of quartz and calcite. In hydrothermal quartz of dominant ore-forming process, three types of fluid inclusions can be observed. They are gas-liquid two-phase aqueous inclusions (W type), daughter mineral-bearing (S type) and CO2 (C type). Homogenization temperatures of fluid inclusions are between 145.5 to 304 degrees C, the salinity of 0.9% similar to 33.1% NaCleqv, and the fluid of this stage generally belongs to the H2O-CO2-NaCl system. The geological characteristics and metallogenic fluid features of Bandiersirehong iron-copper polymetallic deposit suggest that it is a skarn deposit. Regional fault provide migration pathways for the emplacement of metallogenic magma, which developped magmatic fluid systems and followed the Cu-Fe mineralization.
- 出版日期2015-9
- 单位中国地质科学院矿产资源研究所; 吉林大学
