CO2-CH4-N-2-rich Inclusions in Gold-rich Ore from the Wulong Gold Deposit, Liaoning, China
Cheng, Xi-Hui; Xu, Jiu-Hua; Zhang, Hui; Chen, Dong-Liang; Bian, Chun-Jing; Chen DL(陈栋梁)
刊名INTERNATIONAL CONFERENCE ON ENERGY AND ENVIRONMENT ENGINEERING (ICEEE 2015)
2015
页码409-414
关键词Gold Deposit CO2-rich Fluids East Liaoning SRXRF Analysis
学科分类Energy & Fuels; Engineering
文章类型Proceedings Paper
英文摘要The Wulong gold deposit, situated in southeast Liaoning of China, which is a larger vein gold deposit occurring in biotite granitic gneiss of Indo-Chinese epoch and the occurrences of gold veins were strictly controlled by faults. Gold mineralzation can be identified as five stages, and gold-rich ores were formed in stages III and IV. There are great number of fluid inclusions in vein quartz of gold-rich ores. They can be divided into three types: (1) carbonic inclusions (L-CO2, usually with CH4 and/or N-2); (2) H2O-CO2 inclusions (L-CO2-L-H2O +/- CH4 +/- N2), with 30 similar to 70% of CO2/H2O ratios; (3) aqueous inclusions (L-H2O-V-H2O). Fluid inclusion study has focuced on stage III and IV. Microthermometric studies show that the solid CO2 melting temperatures (t(m,CO2)) of CO2 phases in H2O-CO2 inclusions are concentrated in the range of -61.0 similar to-56.8 degrees C, and the partial homogenization temperatures (t(h,CO2)) vary from 10.1 similar to 28.0 degrees C which are corresponding to the densities being 0.64 similar to 0.86g/cm(3). The CO2 clathrate melting temperatures (t(m,clath)) are in the range of 7.5 similar to 9.8 degrees C, corresponding to the salinities of 0.43%similar to 4.80% NaCleqv. The solid CO2 melting temperatures (t(m,CO2)) of CO2 phases in H2O-CO2 inclusions are concentrated in the range of -61.0 similar to-56.8 degrees C, and the partial homogenization temperatures (t(h,CO2)) vary from 10.1 similar to 28.0 degrees C which are corresponding to the densities being 0.64 similar to 0.86g/cm(3). Most of inclusions show that the homogenization temperatures (t(h,total)) are from 206 degrees C to 385 degrees C. Aqueous inclusions (L-V) have -4.3 similar to-0.9 degrees C of ice melting temperature, with the salinities being 1.55%similar to 6.58% NaCleqv and the densities being 0.72 similar to 0.94g/cm(3). The results of laser Raman show that the gas phases of both L-CO2 +/- CH4 +/- N2 and LH2O-L-CO2 +/- CH4 +/- N2 inclusions are mainly CO2. It is indicated that fluid inclusions in the Wulong gold deposit are characterized by intermediate temperatures, low salinities, and rich in CO2-CH4 +/- N-2. The SRXRF tests indicate that the minor elements in the fluids are Au-rich, suggesting that H2O-CO2 fluid might have had close relationship with gold enrichment. By comprehensive studies, the conclusion can be drawn that the ore-forming fluid of auriferous quartz veins in Wulong gold deposit belongs to the medium-high homogenization temperatures, low salinities, and rich in CO2-CH4 +/- N-2. The initial fluids of auriferous quartz veins in Wulong gold deposit were rich in CO2 and reacted with gneissic biotite granite during mineralization, which resulted in formation of CO2-CH4 +/- N-2-rich gold-bearing fluids, and resulting in gold enrichment.
类目[WOS]Energy & Fuels ; Engineering, Environmental ; Engineering, Electrical & Electronic
收录类别CPCI
WOS记录号WOS:000352343500072
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/229284
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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Cheng, Xi-Hui,Xu, Jiu-Hua,Zhang, Hui,et al. CO2-CH4-N-2-rich Inclusions in Gold-rich Ore from the Wulong Gold Deposit, Liaoning, China[J]. INTERNATIONAL CONFERENCE ON ENERGY AND ENVIRONMENT ENGINEERING (ICEEE 2015),2015:409-414.
APA Cheng, Xi-Hui,Xu, Jiu-Hua,Zhang, Hui,Chen, Dong-Liang,Bian, Chun-Jing,&陈栋梁.(2015).CO2-CH4-N-2-rich Inclusions in Gold-rich Ore from the Wulong Gold Deposit, Liaoning, China.INTERNATIONAL CONFERENCE ON ENERGY AND ENVIRONMENT ENGINEERING (ICEEE 2015),409-414.
MLA Cheng, Xi-Hui,et al."CO2-CH4-N-2-rich Inclusions in Gold-rich Ore from the Wulong Gold Deposit, Liaoning, China".INTERNATIONAL CONFERENCE ON ENERGY AND ENVIRONMENT ENGINEERING (ICEEE 2015) (2015):409-414.
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