| 基于电子探针面扫描定量化的石英闪长岩微区成分分析 |
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| 引用本文： | 胡瑶瑶,王浩铮,侯玉杨,宋皓然.基于电子探针面扫描定量化的石英闪长岩微区成分分析[J].岩矿测试,2022(2):260-271. |
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| 作者姓名： | 胡瑶瑶 王浩铮 侯玉杨 宋皓然 |
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| 作者单位： | 西南石油大学地球科学与技术学院, 四川 成都 610500 |
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| 基金项目： | 国家自然科学基金项目(41702199,42072225);国家留学基金委西部人才计划项目(201708515142);国家级创新创业训练项目(S202010615029) |
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| 摘 要： | 岩石的微区成分特征是精细化反演岩石演化的重要依据,而常规的电子探针面扫描分析方法无法提供面扫描区域的定量分析结果.本文使用矿物分布相对均匀的代表性岩石样品开展了岩石薄片的面扫描和矿物的定量分析.通过对常规测试的主量元素的面扫描进行图像校正,并利用ZAF校正后的点分析数据与面扫描图像的灰度值进行最小二乘法曲线拟合的方式,...
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| 关 键 词： | 石英闪长岩 电子探针 面扫描数据定量化 微区有效全岩成分 图像处理 |
| 收稿时间： | 2021/9/28 0:00:00 |
| 修稿时间： | 2021/11/3 0:00:00 |
A Method for Estimating Micro-area Composition of Quartz-diorite Based on Quantitative Mapping of Electron Probe Microanalysis |
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| HU Yaoyao,WANG Haozheng,HOU Yuyang,SONG Haoran.A Method for Estimating Micro-area Composition of Quartz-diorite Based on Quantitative Mapping of Electron Probe Microanalysis[J].Rock and Mineral Analysis,2022(2):260-271. |
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| Authors: | HU Yaoyao WANG Haozheng HOU Yuyang SONG Haoran |
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| Institution: | School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China |
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| Abstract: | BACKGROUND: The estimation of bulk composition of the micro-area of a rock is an important basis of tracing rock evolution. The conventional electron probe microanalysis (EPMA) mapping method cannot provide quantitative analysis results of the surface scanning area.OBJECTIVES: In order to estimate the composition of the micro-area by quantitative mapping of EPMA.METHODS: The mapping and point analyses were carried out to determine the composition of the micro-area of a homogeneous quartz-diorite. By performing image correction of the pixels of the mapping of the major elements, and using the point analysis data after ZAF correction and the gray value of the surface scan image to perform the least square curve fitting method, the X-ray intensity and concentration were converted.RESULTS: By comparing to X-ray fluorescence spectrometry (XRF), the relative errors of SiO2, CaO, FeO, Al2O3 and TiO2 of EPMA method were within 10%, and the relative standard deviation was less than 10%. The relative error and standard deviation of MgO and Na2O were slightly larger, which can be improved by multiple measurements. The K2O content were not accurate due to lack of K-rich silicate minerals'' point analysis.CONCLUSIONS: The results show that the estimation of micro-area composition of a rock with relatively homogeneous mineral distributions can be carried out by using point analyses of EPMA to correct the mapping under good instrument conditions, and the influence of mineral morphology, particle size, and distribution can be reduced by multiple measurements on different sections. |
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| Keywords: | quartz-diorite electron probe microanalysis quantitative compositional mapping bulk-rock composition of micro-area image processing |
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