Study on Epithermal Gold Mineralization System at Shwebontha Prospect,Monywa Copper-Gold Ore Field,Central Myanmar  

作　　者：Toe Naing Oo Agung Harijoko Lucas Donny Setijadji 

机构地区：[1]Department of Geological Engineering,Faculty of Engineering,Gadjah Mada University,Yogyakarta,55281,Indonesia [2]Department of Geology,West Yangon University,Yangon,11181,Myanmar

出　　处：《Advances in Geological and Geotechnical Engineering Research》2023年第1期10-23,共14页地质与岩土工程研究进展（英文）

基　　金：funded by AUN/SEED-Net(JICA program)in the fiscal year 2017-2021.

摘　　要：The Shwebontha prospect area is situated in the Central Volcanic Belt,central Myanmar,where the well-known Sagaing Fault serves as its eastern boundary.This study aims to document key the mineralogy,host rock geochemistry and ore mineralizing fluids.The mineralization,hosted by Upper Oligocene to Middle Miocene rhyolites,displays a strong lithological control.Mineralization is characterized by gold-bearing silicified massive ore and chalcedonic quartz veins in which sulfides are clustered and disseminated not only in quartz gangue but also in rhyolite host rocks.The significant ore minerals in the mineralized veins include pyrite,sphalerite,galena,chalcopyrite,and gold.Common hydrothermal alterations such as silicic,argillic and propylitic alteration types are recognized.According to the fluid inclusion data and interpretation,ore mineralizing fluids in the research area are characterized by formation temperatures of 260-280℃ and salinity of 0.35-2.41%wt.NaCl eq.respectively.Mixing of hydrothermal fluids was generally considered to be an effective mechanism for ore transport and deposition.

关 键 词：Geochemistry ALTERATION Fluid inclusions Ore mineralization Central Volcanic Belt Shwebontha 

分 类 号：P59[天文地球—地球化学]