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Infrared microthermometry of fluid inclusions in transparent to opaque minerals: challenges and new insights
Peng, Hong-Wei1,2; Fan, Hong-Rui1,2,3; Santosh, M.4,5; Hu, Fang-Fang1,2,3; Jiang, Peng6
2020-10-01
Source PublicationMINERALIUM DEPOSITA
ISSN0026-4598
Volume55Issue:7Pages:1425-1440
AbstractInfrared (IR) studies of fluid inclusions in opaque minerals provide direct insights into the ore-forming fluids. However, the challenge posed by the "warming effect" of IR light during microthermometry remains unresolved. Here we address this problem and show that the deviation in temperature of phase changes within fluid inclusions caused by IR light is more common than what was thought before. Our results reveal that transparent to translucent minerals (e.g., quartz, sphalerite) also absorb IR energy. Since IR absorption is influenced by the host mineral, the fluid inclusions hosted by different minerals exhibit different degrees of deviation in temperature during microthermometry. The Fourier transform infrared (FTIR) spectra do not display a consistent correlation between the band gap energy of a mineral and its absorption of IR energy. Minerals with low band gap energy, such as pyrite, absorb limited IR energy, resulting in small deviations of fluid inclusion data. In contrast, this deviation could be significant for fluid inclusions hosted in minerals with a relatively high band gap energy, such as iron-rich sphalerite and wolframite. Substitution of iron increases the absorption of IR energy in these minerals. The substitution of trace elements may also play a role. Our quantitative analyses confirm that using the lowest possible IR light intensity with the smallest diaphragm minimizes the "warming effect" of IR light. We also propose an improved cycling method as a better option where high IR light intensity is required.
KeywordInfrared microscope Deviation of IR microthermometry Absorption of IR light energy FTIR Major and trace element substitution Improved cycling method
DOI10.1007/s00126-019-00950-z
WOS KeywordTOYOHA POLYMETALLIC DEPOSIT ; ORE MINERALS ; LIGHT MICROTHERMOMETRY ; GOLD DEPOSITS ; MICROSCOPY ; WOLFRAMITE ; PYRITE ; QUARTZ ; CONSTRAINTS ; SPHALERITE
Language英语
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000563170900013
PublisherSPRINGER
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/97647
Collection矿产资源研究院重点实验室
Corresponding AuthorFan, Hong-Rui
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.China Univ Geosci Beijing, Sch Earth Sci & Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China
5.Univ Adelaide, Dept Earth Sci, Adelaide, SA 5005, Australia
6.Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA
First Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Mineral Resources, Chinese Academy of Sciences;  Institute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Peng, Hong-Wei,Fan, Hong-Rui,Santosh, M.,et al. Infrared microthermometry of fluid inclusions in transparent to opaque minerals: challenges and new insights[J]. MINERALIUM DEPOSITA,2020,55(7):1425-1440.
APA Peng, Hong-Wei,Fan, Hong-Rui,Santosh, M.,Hu, Fang-Fang,&Jiang, Peng.(2020).Infrared microthermometry of fluid inclusions in transparent to opaque minerals: challenges and new insights.MINERALIUM DEPOSITA,55(7),1425-1440.
MLA Peng, Hong-Wei,et al."Infrared microthermometry of fluid inclusions in transparent to opaque minerals: challenges and new insights".MINERALIUM DEPOSITA 55.7(2020):1425-1440.
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