Evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy

Abstract Hydrous fluids play a vital role in the chemical and rheological evolution of ductile, quartz-bearing continental crust, where fluid percolation pathways are controlled by grain boundary domains. In this study, widths of grain boundary domains in seven quartzite samples metamorphosed under...

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Autores principales:	Ritabrata Dobe, Anuja Das, Rabibrata Mukherjee, Saibal Gupta
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3f67624e8b1d4e0fb3f1bf39c3dde3ff
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spelling	oai:doaj.org-article:3f67624e8b1d4e0fb3f1bf39c3dde3ff2021-12-02T16:57:37ZEvaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy10.1038/s41598-021-89250-z2045-2322https://doaj.org/article/3f67624e8b1d4e0fb3f1bf39c3dde3ff2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89250-zhttps://doaj.org/toc/2045-2322Abstract Hydrous fluids play a vital role in the chemical and rheological evolution of ductile, quartz-bearing continental crust, where fluid percolation pathways are controlled by grain boundary domains. In this study, widths of grain boundary domains in seven quartzite samples metamorphosed under varying crustal conditions were investigated using Atomic Force Microscopy (AFM) which allows comparatively easy, high magnification imaging and precise width measurements. It is observed that dynamic recrystallization at higher metamorphic grades is much more efficient at reducing grain boundary widths than at lower temperature conditions. The concept of force-distance spectroscopy, applied to geological samples for the first time, allows qualitative estimation of variations in the strength of grain boundary domains. The strength of grain boundary domains is inferred to be higher in the high grade quartzites, which is supported by Kernel Average Misorientation (KAM) studies using Electron Backscatter Diffraction (EBSD). The results of the study show that quartzites deformed and metamorphosed at higher grades have narrower channels without pores and an abundance of periodically arranged bridges oriented at right angles to the length of the boundary. We conclude that grain boundary domains in quartz-rich rocks are more resistant to fluid percolation in the granulite rather than the greenschist facies.Ritabrata DobeAnuja DasRabibrata MukherjeeSaibal GuptaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ritabrata Dobe Anuja Das Rabibrata Mukherjee Saibal Gupta Evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy
description	Abstract Hydrous fluids play a vital role in the chemical and rheological evolution of ductile, quartz-bearing continental crust, where fluid percolation pathways are controlled by grain boundary domains. In this study, widths of grain boundary domains in seven quartzite samples metamorphosed under varying crustal conditions were investigated using Atomic Force Microscopy (AFM) which allows comparatively easy, high magnification imaging and precise width measurements. It is observed that dynamic recrystallization at higher metamorphic grades is much more efficient at reducing grain boundary widths than at lower temperature conditions. The concept of force-distance spectroscopy, applied to geological samples for the first time, allows qualitative estimation of variations in the strength of grain boundary domains. The strength of grain boundary domains is inferred to be higher in the high grade quartzites, which is supported by Kernel Average Misorientation (KAM) studies using Electron Backscatter Diffraction (EBSD). The results of the study show that quartzites deformed and metamorphosed at higher grades have narrower channels without pores and an abundance of periodically arranged bridges oriented at right angles to the length of the boundary. We conclude that grain boundary domains in quartz-rich rocks are more resistant to fluid percolation in the granulite rather than the greenschist facies.
format	article
author	Ritabrata Dobe Anuja Das Rabibrata Mukherjee Saibal Gupta
author_facet	Ritabrata Dobe Anuja Das Rabibrata Mukherjee Saibal Gupta
author_sort	Ritabrata Dobe
title	Evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy
title_short	Evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy
title_full	Evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy
title_fullStr	Evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy
title_full_unstemmed	Evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy
title_sort	evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using atomic force microscopy
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3f67624e8b1d4e0fb3f1bf39c3dde3ff
work_keys_str_mv	AT ritabratadobe evaluationofgrainboundariesaspercolationpathwaysinquartzrichcontinentalcrustusingatomicforcemicroscopy AT anujadas evaluationofgrainboundariesaspercolationpathwaysinquartzrichcontinentalcrustusingatomicforcemicroscopy AT rabibratamukherjee evaluationofgrainboundariesaspercolationpathwaysinquartzrichcontinentalcrustusingatomicforcemicroscopy AT saibalgupta evaluationofgrainboundariesaspercolationpathwaysinquartzrichcontinentalcrustusingatomicforcemicroscopy
_version_	1718382497064026112

Evaluation of grain boundaries as percolation pathways in quartz-rich continental crust using Atomic Force Microscopy

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