Characterisation of phosphate mineralogy in Montebras-en-Soumans Pegmatite, Massif Central, France

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Authors

Cassian P. F. Pirard 

Abstract

Montebras-en-Soumans pegmatitic cupola hosts large pods of phosphate composed of primary amblygonite-montebrasite. These aluminium phosphate masses are considerably altered by post-magmatic processes producing a number of secondary metasomatic hydrothermal phosphates (lacroixite, wardite, morinite, viitaniemiite, apatite, triplite, eosphorite) and low-temperature phosphates (apatite, crandallite, goyazite, gorceixite, variscite, turquoise, wavellite). Also found in this study are a Mn-rich viitaniemiite-like phase and an unknown Na-Al-P fluoride. A number of techniques are used to characterise these mineral phases including optical studies, cathodoluminescence (cold & hot), electron-probe micro-analysis (wavelength & energy dispersive spectra), X-ray diffraction, laser ablation inductively coupled plasma mass spectroscopy and infrared spectroscopy.

DOI

https://doi.org/10.31223/X5T35S

Subjects

Earth Sciences, Geochemistry, Geology, Mineral Physics

Keywords

Pegmatite, aluminium phosphates, amblygonite-montebrasite, Montebras, Cathodoluminescence, Trace elements

Dates

Published: 2022-09-22 04:15

Last Updated: 2022-09-22 11:15

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

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