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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu


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Volume 102, Issue 7

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17O NMR evidence of free ionic clusters Mn+ CO32− in silicate glasses: Precursors for carbonate-silicate liquids immiscibility

Yann Morizet
  • Corresponding author
  • Université de Nantes, Nantes Atlantique Universités, Laboratoire de Planétologie et Géodynamique de Nantes (LPG), UMR CNRS 6112, 2 rue de la Houssinière, 44322, NANTES, France
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/ Pierre Florian
  • CNRS-CEMHTI Conditions Extrêmes et Matériaux: Haute Température et Irradiation, UPR 3079, 1D avenue de la Recherche Scientifique, 45071, Orléans, France
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/ Michael Paris
  • Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP32229, 44322 Cedex 3, NANTES, France
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/ Fabrice Gaillllard
  • CNRS/INSU-Université d’Orléans—BRGM, UMR 7327, Institut des Sciences de la Terre d’Orléans, 1A rue de la Férollerie, 45071, Orléans, France
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Published Online: 2017-07-19 | DOI: https://doi.org/10.2138/am-2017-6133

Abstract

Carbon dioxide is a ubiquitous component of low-silica melts such as kimberlites or melilitites. It is currently assumed that CO2 molecules dissolving in low-silica melts as carbonate groups (CO32) induce a strong polymerization of the silicate network; however, the exact molecular configuration of this dissolution mechanism is still debated.

Using 17O MAS NMR spectroscopy, we have investigated the carbonate molecular environment in a series of synthesized low-silica (31–41 wt% SiO2), CO2-bearing (from 2.9 to 13.2 wt% CO2) silicate glasses analogous to melilitites and kimberlites. With the selective {13C}-, {27Al}-, and {29Si}-17O J HMQC NMR method, we show that CO2 dissolved in the studied low-silica glasses is totally disconnected from the silicate network, forming free ionic clusters (FIC) Mn+ (CO32) with Mn+, a charge compensating cation.

The Mn+ (CO32) FIC are considered as precursors to immiscibility in between carbonate and silicate liquids. Observed in all studied compositions, we suggest that this immiscibility can be produced from moderately to strongly depolymerized silicate melt compositions.

Keywords: 17O NMR spectroscopy; CO2 dissolution mechanism; free ionic clusters; silicate glasses; immiscibility

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About the article

Received: 2017-03-07

Accepted: 2017-04-02

Published Online: 2017-07-19

Published in Print: 2017-07-26


Citation Information: American Mineralogist, Volume 102, Issue 7, Pages 1561–1564, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2017-6133.

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© 2017 by Walter de Gruyter Berlin/Boston.

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