Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal

Few studies have focused on gem-quality tourmaline acting as a petrogenetic recorder, and the colour genesis of pink elbaite is still controversial. We carry out in situ major, trace element and boron isotope composition analyses on a single tourmaline crystal. This crystal is characterized by sudde...

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Autores principales:	Beiqi Zheng, Meihua Chen
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	evolution substitution colourization mechanism boron isotope Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/2a87756dca924462965d8b853916a457
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spelling	oai:doaj.org-article:2a87756dca924462965d8b853916a4572021-11-25T17:18:54ZGem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal10.3390/cryst111113632073-4352https://doaj.org/article/2a87756dca924462965d8b853916a4572021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1363https://doaj.org/toc/2073-4352Few studies have focused on gem-quality tourmaline acting as a petrogenetic recorder, and the colour genesis of pink elbaite is still controversial. We carry out in situ major, trace element and boron isotope composition analyses on a single tourmaline crystal. This crystal is characterized by sudden transformation from colourless to pink, which can represent full pegmatite magma evolution. According to the analysis results, all spots are divided into alkali groups according to X-site occupancy and subdivided into elbaite series. The pink part accommodates higher concentrations of volatile and incompatible elements. The result is most consistent with successive pegmatite evolution in which the colourless part crystallized from the early stage, while the pink part crystallized from the late stage. The relatively consistent δ<sup>11</sup>B value between the colourless and the pink part suggests no fluid exsolution occurred during pegmatite evolution. The slight increase of δ<sup>11</sup>B values within the pink part and the colourless part may be due to mica crystallization. The combination of (Li<sup>+</sup>+Mn<sup>2+</sup>) (Al<sup>3+</sup>+X<sub>vac</sub>)-<sub>1</sub> and the exclusive positive linear relationship of Mn<sup>2+</sup> vs. Ti<sup>4+</sup> indicate that Mn<sup>2+</sup> is the main cause of pink, while Mn<sup>2+</sup>-Ti<sup>4+</sup> intervalence charge transfer also plays an important role.Beiqi ZhengMeihua ChenMDPI AGarticleevolutionsubstitutioncolourization mechanismboron isotopeCrystallographyQD901-999ENCrystals, Vol 11, Iss 1363, p 1363 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	evolution substitution colourization mechanism boron isotope Crystallography QD901-999
spellingShingle	evolution substitution colourization mechanism boron isotope Crystallography QD901-999 Beiqi Zheng Meihua Chen Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal
description	Few studies have focused on gem-quality tourmaline acting as a petrogenetic recorder, and the colour genesis of pink elbaite is still controversial. We carry out in situ major, trace element and boron isotope composition analyses on a single tourmaline crystal. This crystal is characterized by sudden transformation from colourless to pink, which can represent full pegmatite magma evolution. According to the analysis results, all spots are divided into alkali groups according to X-site occupancy and subdivided into elbaite series. The pink part accommodates higher concentrations of volatile and incompatible elements. The result is most consistent with successive pegmatite evolution in which the colourless part crystallized from the early stage, while the pink part crystallized from the late stage. The relatively consistent δ<sup>11</sup>B value between the colourless and the pink part suggests no fluid exsolution occurred during pegmatite evolution. The slight increase of δ<sup>11</sup>B values within the pink part and the colourless part may be due to mica crystallization. The combination of (Li<sup>+</sup>+Mn<sup>2+</sup>) (Al<sup>3+</sup>+X<sub>vac</sub>)-<sub>1</sub> and the exclusive positive linear relationship of Mn<sup>2+</sup> vs. Ti<sup>4+</sup> indicate that Mn<sup>2+</sup> is the main cause of pink, while Mn<sup>2+</sup>-Ti<sup>4+</sup> intervalence charge transfer also plays an important role.
format	article
author	Beiqi Zheng Meihua Chen
author_facet	Beiqi Zheng Meihua Chen
author_sort	Beiqi Zheng
title	Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal
title_short	Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal
title_full	Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal
title_fullStr	Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal
title_full_unstemmed	Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal
title_sort	gem elbaite as a recorder of pegmatite evolution: in situ major, trace elements and boron isotope analysis of a colour-zoning tourmaline crystal
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2a87756dca924462965d8b853916a457
work_keys_str_mv	AT beiqizheng gemelbaiteasarecorderofpegmatiteevolutioninsitumajortraceelementsandboronisotopeanalysisofacolourzoningtourmalinecrystal AT meihuachen gemelbaiteasarecorderofpegmatiteevolutioninsitumajortraceelementsandboronisotopeanalysisofacolourzoningtourmalinecrystal
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Gem Elbaite as a Recorder of Pegmatite Evolution: In Situ Major, Trace Elements and Boron Isotope Analysis of a Colour-Zoning Tourmaline Crystal

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