A Method for Estimating Micro-area Composition of Quartz-diorite Based on Quantitative Mapping of Electron Probe Microanalysis

HU Yaoyao; WANG Haozheng; HOU Yuyang; SONG Haoran

doi:10.15898/j.cnki.11-2131/td.202109280132

Rock and Mineral Analysis > 2022 > 41(2): 260-271. > DOI: 10.15898/j.cnki.11-2131/td.202109280132

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, 41(2): 260-271. DOI: 10.15898/j.cnki.11-2131/td.202109280132

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A Method for Estimating Micro-area Composition of Quartz-diorite Based on Quantitative Mapping of Electron Probe Microanalysis

School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

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Received Date: September 27, 2021
Revised Date: November 02, 2021
Accepted Date: November 26, 2021
Published Date: March 27, 2022

Abstract

HIGHLIGHTS
(1) The mapping results of electron probe microanalysis establish a good relationship with the quantitative analysis results.

(2) The quantitative data processing uses the relationship between the mapping and point analyses.

(3) The quantitative mapping results of the micro-area of homogeneous rock was consistent with the results of bulk rock measured by X-ray fluorescence spectrometry (XRF).

ABSTRACT

BACKGROUNDThe 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.
OBJECTIVESIn order to estimate the composition of the micro-area by quantitative mapping of EPMA.
METHODSThe 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.
RESULTSBy 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.
CONCLUSIONSThe 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.
- quartz-diorite,
- electron probe microanalysis,
- quantitative compositional mapping,
- bulk-rock composition of micro-area,
- image processing

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References (41)

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