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Estimation of effective bulk composition�critical appraisal and a scanning electron microscope based approach

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dc.contributor.authorSharma, Jeev Jatan
dc.contributor.authorNaik, Aditya
dc.contributor.authorPant, Naresh
dc.contributor.authorArora, Devsamridhi
dc.contributor.authorPandey, Mayuri
dc.contributor.authorSingh, Preeti
dc.date.accessioned2025-01-30T06:02:49Z
dc.date.available2025-01-30T06:02:49Z
dc.date.issued2021
dc.description.abstractPseudosections generated using the correctly estimated effective bulk composition (EBC), that is, the bulk of the closed metamorphic system that stays in chemical equilibrium are crucial in deciphering the PT history of a metamorphic terrain. A variety of tools are used by metamorphic petrologists to calculate the effective bulk of a sample, such as XRF bulk data, average bulk using point count analysis, and using X-ray maps areal analysis, each with its own limitations. In this work, we demonstrate a scanning electron microscopy (SEM) based method to generate EBC, by analysing multiple grids of a thin section using area spectrum analysis tool and energy dispersive spectrometry (EDS) acquisition function of electron microscopes. The pseudosections generated using EBC estimated by SEM based method are tested over two pelitic granulites of east Antarctic shield and a medium-grade metapelite from North Delhi Fold Belt of the Indian shield. The results are validated through thermobarometric estimations and are compared with pseudosections produced by using other bulk determination methods, such as XRF data and average bulk combining modal percentage with the mineral compositions. We propose that this method of calculating EBC is better compared to the other methods, as it allows the user to define the localized bulk of a particular domain, besides being a simpler and faster approach than other commonly used methods. � 2021 John Wiley & Sons Ltd
dc.identifier.doihttps://doi.org/10.1002/gj.4077
dc.identifier.issn721050
dc.identifier.urihttps://dl.bhu.ac.in/ir/handle/123456789/25053
dc.publisherJohn Wiley and Sons Ltd
dc.subjecteffective bulk composition
dc.subjectpseudosections
dc.subjectSEM
dc.subjectTHERMOCALC
dc.titleEstimation of effective bulk composition�critical appraisal and a scanning electron microscope based approach
dc.typeArticle
dspace.entity.typePublication
journal.titleGeological Journal
journalvolume.identifier.volume56

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2021