Abstract
A rapid and precise quantitative electron probe chemical mapping technique and its application to an ultrahigh-pressure eclogite from the Moldanubian Zone of the Bohemian Massif (Nové Dvory, Czech Republic)
Highlights
An electron probe microanalyzer (EPMA) is a common tool to analyze chemical compositions of minerals
We suggest that the pyroxene-rich layer was derived from a pyroxenitic melt that intruded the eclogite
Quantitative X‐ray mapping is a possible application of EPMA analysis
Summary
An electron probe microanalyzer (EPMA) is a common tool to analyze chemical compositions of minerals. Two common applications of an EPMA are quantitative spot analysis and X‐ray mapping The former collects an X‐ray signal from an unknown sample that is compared to a standard signal intensity to quantify elemental concentrations. XMapTools addresses matrix effects by implementing (1) classifying mineral phases based on mapping data and (2) converting X‐ray intensities into calibrated mass concentrations for each mineral phase by comparing the X‐ray map to referential spot analysis within a mapped area Both steps assume each pixel of the mapped area is attributed to a single mineral phase and require a sufficiently small mapping-beam diameter. When a mapped area contains fine-grained textures such as accessory minerals and symplectite, a small beam diameter with a large step size may miss grains that were analyzed as an internal standard, for inequigranular textures Such lowresolution maps are inadequate for use in discussing variations in local bulk compositions because of possible underestimation of the abundance of fine-grained phases. The results show that centimeter-scale quantitative chemical mapping is a powerful tool for evaluating millimeter-scale compositional variations in rocks
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