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Morizet, Y., Florian, P., Paris, M. & Gaillllard, F. (2017) O-17 NMR evidence of free ionic clusters Mn+ CO32- in silicate glasses: Precursors for carbonate-silicate liquids immiscibility. American Mineralogist, 102 1561–1564. 
Added by: Richard Baschera (2017-10-24 13:30:34)   Last edited by: Richard Baschera (2017-10-24 13:44:50)
Type de référence: Article
DOI: 10.2138/am-2017-6133
Numéro d'identification (ISBN etc.): 0003-004X
Clé BibTeX: Morizet2017b
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Catégories: IMN
Créateurs: Florian, Gaillllard, Morizet, Paris
Collection: American Mineralogist
Consultations : 1/400
Indice de consultation : 3%
Indice de popularité : 0.75%
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 O-17 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 {C-13}-, {Al-27}-, and {Si-29}-O-17 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.
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