Characteristics of fluid inclusions and mineralization of lode gold deposits in the greenstone belt of northern Madagascar

被引：0
|
作者：
Wu D. [1 ]
Sun W. [1 ]
Zhao Y. [2 ]
Xu F. [1 ]
Xu T. [3 ]
Wang K. [1 ]
机构：
[1] Shenyang Geological Survey Center, China Geological Survey, Shenyang
[2] Comprehensive Survey Center of Mudanjiang Natural Resources, China Geological Survey, Mudanjiang
[3] Geological Exploration Technology Institute of Jiangsu Province, Nanjing
来源：
Zhao, Yuandong (zhaoyd1981@qq.com) | 1600年 / Geological Society of China卷 / 95期
关键词：
Fluid inclusion; Greenstone belt; Madagascar; Ore-forming material sources; Quartz vein type gold deposit;
D O I：
10.19762/j.cnki.dizhixuebao.2021036
中图分类号：
学科分类号：
摘要：
To investigate the mineralization temperature and material source of quartz vein type gold deposits in the northern Greenstone belt of Madagascar, relatively well developed fluid inclusions were studied in the Maevatananaand the Andriamena quartz vein type gold deposits in the greenstone belt. There are H2O-NaCl inclusions, namely aqueous solution type (Class Ⅰ); CO2-H2O-NaCl inclusion, namely LH2O+VCO2 type (Class Ⅱ); CO2-rich inclusions, namely LH2O+LCO2+VCO2 type (Class Ⅲ), and a small amount of H2O-NaCl containing daughter crystals, namely NaCl daughter mineral type (Class Ⅳ). The metallogenic stage can be divided into the early metallogenic stage, the main metallogenic stage and the late metallogenic stage. The early metallogenic stage is dominated by Class Ⅰ and Class Ⅱ inclusions, and occasionally a few Class Ⅳ NaCl subcrystalline inclusions. The main metallogenic stage is mostly dominated by Class Ⅱ and Class Ⅲ inclusions, while the late metallogenic stage is dominated by Class Ⅰ inclusions. The mineralization fluids of Maev and Adm gold deposits are dominated by CO2-NaCl-H2O, and contain different degrees of CH4, N2 and H2, as well as a small amount of H2S volatilization, showing CO2 rich, medium and low salinity, medium and high temperature immiscibility.Combined with the existing regional geological background and diagenetic ore-forming characteristics, it is inferred that the fluid mineralization is closely related to the formation of a large number of granitic magmas through co-melting or re-melting and the location of upper emplacement; the deposit formation is related to the intrauterine collision orogenic process, and the deep source material is involved in the mineralization. © 2021, Science Press. All right reserved.
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页码：1231 / 1244
页数：13
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