Articles | Volume 35, issue 5
https://doi.org/10.5194/ejm-35-831-2023
https://doi.org/10.5194/ejm-35-831-2023
Research article
 | 
04 Oct 2023
Research article |  | 04 Oct 2023

Very-low-grade phyllosilicates in the Aravis massif (Haute-Savoie, France) and the di-trioctahedral substitution in chlorite

Benoît Dubacq, Guillaume Bonnet, Manon Warembourg, and Benoît Baptiste

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Short summary
Minerals in a vein network from the Aravis limestone (Haute-Savoie, France) include carbonates, quartz, fluorite and phyllosilicates, crystallized at around 7 km depth and 190 °C. The mineralogy has been studied with emphasis on the chlorite types: chamosite (iron-rich), cookeite (lithium-rich) and sudoite. The presence of the three chlorite types sheds light on their phase diagrams, and observed cationic substitutions confirm the need for more systematic measurement of lithium in chlorite.