Estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach
Pseudosections 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 t...
Published in: | Geological Journal |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/gj.4077 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.4077 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/gj.4077 |
id |
crwiley:10.1002/gj.4077 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/gj.4077 2024-06-02T07:58:42+00:00 Estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach Sharma, Jeev Jatan Naik, Aditya Pant, Naresh Arora, Devsamridhi Pandey, Mayuri Singh, Preeti 2021 http://dx.doi.org/10.1002/gj.4077 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.4077 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/gj.4077 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geological Journal volume 56, issue 6, page 2950-2962 ISSN 0072-1050 1099-1034 journal-article 2021 crwiley https://doi.org/10.1002/gj.4077 2024-05-06T07:00:35Z Pseudosections 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. Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library Antarctic Indian Geological Journal 56 6 2950 2962 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Pseudosections 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. |
format |
Article in Journal/Newspaper |
author |
Sharma, Jeev Jatan Naik, Aditya Pant, Naresh Arora, Devsamridhi Pandey, Mayuri Singh, Preeti |
spellingShingle |
Sharma, Jeev Jatan Naik, Aditya Pant, Naresh Arora, Devsamridhi Pandey, Mayuri Singh, Preeti Estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach |
author_facet |
Sharma, Jeev Jatan Naik, Aditya Pant, Naresh Arora, Devsamridhi Pandey, Mayuri Singh, Preeti |
author_sort |
Sharma, Jeev Jatan |
title |
Estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach |
title_short |
Estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach |
title_full |
Estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach |
title_fullStr |
Estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach |
title_full_unstemmed |
Estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach |
title_sort |
estimation of effective bulk composition—critical appraisal and a scanning electron microscope based approach |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/gj.4077 https://onlinelibrary.wiley.com/doi/pdf/10.1002/gj.4077 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/gj.4077 |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Geological Journal volume 56, issue 6, page 2950-2962 ISSN 0072-1050 1099-1034 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/gj.4077 |
container_title |
Geological Journal |
container_volume |
56 |
container_issue |
6 |
container_start_page |
2950 |
op_container_end_page |
2962 |
_version_ |
1800742204330737664 |