[en] The Montebras pegmatitic cupola, Massif Central, France, hosts large pods of aluminum phosphates mainly composed of primary amblygonite-montebrasite. These phosphate masses are considerably altered by post-magmatic processes, leading to the formation of a number of secondary metasomatic hydrothermal phosphates (lacroixite, wardite, morinite, viitaniemiite, fluorapatite, triplite, eosphorite) and low-temperature phosphates (fluorapatite, crandallite, goyazite, gorceixite, variscite, turquoise, wavellite). A Mn-rich viitaniemiite-like phase, as well as an unknown Na-Al-P fluoride, were also identified. These phosphate assemblages were first observed with a classical polarizing microscope, but we demonstrated that cathodoluminescence microscopy was a powerful tool to decipher the complex petrography of these phases. Electron-microprobe analyses, as well as laser ablation inductively coupled plasma-mass spectroscopy, were used to characterize the trace-and major-elemental composition of those phosphates. These results allowed the determination of genetic sequences, explaining the crystallization of aluminum phosphates at different stages of the Montebras pegmatite evolution.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Pirard, Cassian ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Depret, Martin ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Hatert, Frédéric ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie
Language :
English
Title :
MINERALOGY AND GEOCHEMISTRY OF ALUMINUM PHOSPHATES FROM THE MONTEBRAS PEGMATITE, MASSIF CENTRAL, FRANCE
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