High-fidelity and high-resolution phase mapping of granites via confocal Raman imaging

Abstract In physical sciences such as chemistry and earth sciences, specifically for characterization of minerals in a rock, automated, objective mapping methods based on elemental analysis have replaced traditional optical petrography. However, mineral phase maps obtained from these newer approache...

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Autores principales:	Krishna C. Polavaram, Nishant Garg
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/121d08f1a58a45988cc705a95351b456
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spelling	oai:doaj.org-article:121d08f1a58a45988cc705a95351b4562021-12-02T18:03:21ZHigh-fidelity and high-resolution phase mapping of granites via confocal Raman imaging10.1038/s41598-021-87488-12045-2322https://doaj.org/article/121d08f1a58a45988cc705a95351b4562021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87488-1https://doaj.org/toc/2045-2322Abstract In physical sciences such as chemistry and earth sciences, specifically for characterization of minerals in a rock, automated, objective mapping methods based on elemental analysis have replaced traditional optical petrography. However, mineral phase maps obtained from these newer approaches rely on conversion of elemental compositions to mineralogical compositions and thus cannot distinguish mineral polymorphs. Secondly, these techniques often require laborious sample preparations such as sectioning, polishing, and coating which are time-consuming. Here, we develop a new Raman imaging protocol that is capable of mapping unpolished samples with an auto-focusing Z-mapping feature that allows direct fingerprinting of different polymorphs. Specifically, we report a new methodology for generating high fidelity phase maps by exploiting characteristic peak intensity ratios which can be extended to any multi-phase, heterogenous system. Collectively, these enhancements allow us to rapidly map an unpolished granite specimen (~ 2 × 2 mm) with an exceptionally high accuracy (> 97%) and an extremely fine spatial resolution (< 0.3–2 µm).Krishna C. PolavaramNishant GargNature 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 Krishna C. Polavaram Nishant Garg High-fidelity and high-resolution phase mapping of granites via confocal Raman imaging
description	Abstract In physical sciences such as chemistry and earth sciences, specifically for characterization of minerals in a rock, automated, objective mapping methods based on elemental analysis have replaced traditional optical petrography. However, mineral phase maps obtained from these newer approaches rely on conversion of elemental compositions to mineralogical compositions and thus cannot distinguish mineral polymorphs. Secondly, these techniques often require laborious sample preparations such as sectioning, polishing, and coating which are time-consuming. Here, we develop a new Raman imaging protocol that is capable of mapping unpolished samples with an auto-focusing Z-mapping feature that allows direct fingerprinting of different polymorphs. Specifically, we report a new methodology for generating high fidelity phase maps by exploiting characteristic peak intensity ratios which can be extended to any multi-phase, heterogenous system. Collectively, these enhancements allow us to rapidly map an unpolished granite specimen (~ 2 × 2 mm) with an exceptionally high accuracy (> 97%) and an extremely fine spatial resolution (< 0.3–2 µm).
format	article
author	Krishna C. Polavaram Nishant Garg
author_facet	Krishna C. Polavaram Nishant Garg
author_sort	Krishna C. Polavaram
title	High-fidelity and high-resolution phase mapping of granites via confocal Raman imaging
title_short	High-fidelity and high-resolution phase mapping of granites via confocal Raman imaging
title_full	High-fidelity and high-resolution phase mapping of granites via confocal Raman imaging
title_fullStr	High-fidelity and high-resolution phase mapping of granites via confocal Raman imaging
title_full_unstemmed	High-fidelity and high-resolution phase mapping of granites via confocal Raman imaging
title_sort	high-fidelity and high-resolution phase mapping of granites via confocal raman imaging
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/121d08f1a58a45988cc705a95351b456
work_keys_str_mv	AT krishnacpolavaram highfidelityandhighresolutionphasemappingofgranitesviaconfocalramanimaging AT nishantgarg highfidelityandhighresolutionphasemappingofgranitesviaconfocalramanimaging
_version_	1718378734661140480

High-fidelity and high-resolution phase mapping of granites via confocal Raman imaging

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