The Buchuk orogenic gold deposit in Kyrgyzstan: Evidences from fluid inclusions and H-O-S isotopes

被引：0
作者：
Shi P. [1 ]
Qu H. [1 ]
Jianxin E. [1 ]
Liu C. [1 ]
Miao G. [1 ,2 ]
Ma Q. [1 ]
Dai Y. [1 ]
机构：
[1] China Gold Group Geology Co., Ltd., Beijing
[2] School of Earth Sciences and Resources, China University of Geosciences, Beijing
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 03期
关键词：
Buchuk gold deposit; fluid inclusions; Kyrgyzstan; North Tianshan tectonic belt; orogenic gold deposit; stable isotope;
D O I：
10.19762/j.cnki.dizhixuebao.2023114
中图分类号：
学科分类号：
摘要：
The lack of data on mineral deposits in the North Tianshan tectonic belt of Kyrgyzstan restricts the comparison of mineralization in China and abroad in the Tianshan orogenic belt. The Buchuk gold deposit is located in the middle of the Kyrgyz North Tianshan tectonic belt. The gold ore bodies arc developed in the NWW-trending ductile shear zone in the form of quartz complex veins. The ore body is inclined to SSW, with a dip angle of 60°~70°. The ore-hosting wall rock is mainly syenite porphyry intruded into the Early Paleozoic metamorphic clastic complex. The observation of quartz fluid inclusions, quartz H-O isotope, and sulfide S isotope test results show that the size of the inclusions in the quartz veins of the Buchuk gold deposit is concentrated between 2~10 μm, and the types of inclusions are mainly H2O-CO2type, CO2-rich type, and aqueous solution type. The components of fluid inclusions are characterized by being rich in CO2and containing CH4. The ore-forming fluid has the characteristics of mesothermal (200 ~320°C) and low salinity (3%~7% NaCleqv). The quartz δDV-SMOWvalues range from -108. l%o to - 90. 2%o, and δ18Ofluidfluid values range from 4. 86%a to 9. 26%o; the pyrites δ34S are distributed around 0%o (-0. 9%o to 1. 6%o). Based on the data in this paper, the geological characteristics of the deposit, and the regional geological data, this paper proposes that the Buchuk gold deposit is an orogenic gold deposit developed in the North Tianshan tectonic belt in Kyrgyzstan, and ductile shear zone controls the mineralization process. The ore-forming hydrothermal fluids come from the metamorphic dehydration of carbon-bearing strata, and the ore-forming materials come from deep magmatic rocks. © 2023 Geological Society of China. All rights reserved.
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页码：738 / 752
页数：14
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