Gamma-enhancement of reflected light images: A rapid, effective tool for assessment of compositional heterogeneity in pyrite
文献类型：期刊论文
| 作者 | Zhu, QiaoQiao2,3; Cook, Nigel J.3; Xie, GuiQing1; Ciobanu, Cristiana L.4; Jian, Wei2; Wade, Benjamin P.5; Xu, Jing4,6 |
| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2021-04-01 |
| 卷号 | 106期号:4页码:497-505 |
| ISSN号 | 0003-004X |
| 关键词 | Compositional heterogeneity reflectance pyrite non-destructive analysis Gamma correction Understanding Paleo-Ocean Proxies: Insights from In Situ Analyses |
| DOI | 10.2138/am-2020-7606 |
| 英文摘要 | Trace/minor element variation in pyrite is a feature that has proved invaluable for reconstructing a wide range of geological processes. Routine reflectance observations commonly fail to constrain this variation due to the typically subtle and barely perceptible change in reflectance brought about by deviation from ideal stoichiometry. Such differences may be difficult or impossible to observe in conventional polished sections using standard optical microscopes, at least without oil immersion. Chemical etching and staining, although widely used, are destructive, hazardous, or both, and the etching process is not completely reproducible. Here we use the g correction method to enhance optical digital signal differences obtained in reflected light to constrain compositional heterogeneity in pyrite from a representative hydrothermal ore deposit in eastern China. The g-enhanced images show significant reflectance variation caused by compositional heterogeneity, confirmed by quantitative electron microprobe analysis and qualitative imaging. Higher reflectance domains in g-enhanced images correspond to increases in the effective number of free electrons, whereas darker domains are attributed to the decrease of these free electrons by trace/minor element substitution in pyrite (e.g., As). Gamma correction provides a rapid, effective, non-destructive method to constrain compositional heterogeneity of pyrite through enhancement of reflectance variation. Used alone, this method is unable to determine the chemical composition due to simultaneous substitutions, causing a disparate increase or decrease of reflectance, in most ore minerals. Nevertheless, g correction may be sufficient to predict the substitution of trace/minor elements under the optical microscope prior to scanning electron microscope imaging and quantitative investigation of mineral composition and may help constrain links between textures and compositions of pyrite in evolving ore systems, which could also be applied to other ore minerals with negligible bireflectance. |
| WOS关键词 | TRACE-ELEMENT CONTENT ; SEDIMENTARY PYRITE ; ARSENIAN PYRITE ; SULFUR ISOTOPE ; DEPOSIT ; MINERALS ; EVOLUTION ; TEXTURES ; PORPHYRY ; AU |
| 资助项目 | National Natural Science Foundation of China[41702093] ; National Natural Science Foundation of China[41925011] ; National Key Research and Development Plan[2016YFC0600206] ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard[KK1702] ; China Scholarship Council (CSC)[201808110086] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | MINERALOGICAL SOC AMER |
| WOS记录号 | WOS:000646025000001 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan ; National Key Research and Development Plan ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan ; National Key Research and Development Plan ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan ; National Key Research and Development Plan ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Plan ; National Key Research and Development Plan ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard ; Basic Scientific Research Operation Cost of State-Leveled Public Welfare Scientific Research Courtyard ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101192]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Xie, GuiQing |
| 作者单位 | 1.China Univ Geosci, Inst Earth Sci, Beijing 100083, Peoples R China 2.CAGS, MNR Key Lab Metallogeny & Mineral Assessment, Inst Mineral Resources, Beijing 100037, Peoples R China 3.Univ Adelaide, Sch Civil Environm & Min Engn, Adelaide, SA 5005, Australia 4.Univ Adelaide, Sch Chem Engn & Adv Mat, Adelaide, SA 5005, Australia 5.Univ Adelaide, Adelaide Microscopy, Adelaide, SA 5005, Australia 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, QiaoQiao,Cook, Nigel J.,Xie, GuiQing,et al. Gamma-enhancement of reflected light images: A rapid, effective tool for assessment of compositional heterogeneity in pyrite[J]. AMERICAN MINERALOGIST,2021,106(4):497-505. |
| APA | Zhu, QiaoQiao.,Cook, Nigel J..,Xie, GuiQing.,Ciobanu, Cristiana L..,Jian, Wei.,...&Xu, Jing.(2021).Gamma-enhancement of reflected light images: A rapid, effective tool for assessment of compositional heterogeneity in pyrite.AMERICAN MINERALOGIST,106(4),497-505. |
| MLA | Zhu, QiaoQiao,et al."Gamma-enhancement of reflected light images: A rapid, effective tool for assessment of compositional heterogeneity in pyrite".AMERICAN MINERALOGIST 106.4(2021):497-505. |
入库方式： OAI收割
来源：地质与地球物理研究所
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