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Étude gîtologique des minéralisations fluorées du Massif du Rocheray, Savoie (Alpes françaises externes)

Abstract : This work on the Rocheray aims to determine the nature of the link between the vein and the mineralized horizons of Montvernier. It appeared that Montvernier's problem was closely linked to the nature of the metallogenic factors controlling the Rocheray mineralizations, and that it was necessary to study these mineralizations globally. The Montvernier deposit was chosen as a pilot deposit because of its character of both vein and stratiform mineralization. To highlight the existence of non-outcropping accidents likely to have played the role of "conduits" to supply mineralized horizons, we carried out in 1973 a geochemical prospecting of residual soils, and macro and microscopic studies of parageneses minerals of both types of mineralization; these were supplemented by thermo-optical measurements and various analyzes, the results of which made it possible to set the minimum conditions for the formation of the deposit. In 1978, these studies were resumed and extended to all of the Rocheray mineralizations. The first part is devoted to the re-examination of the geological environment which makes it possible to locate the mineralizations in their natural setting, then to the detailed description of these mineralizations. In the second part, more properly gitological, are examined successively the physicochemical conditions of formation and the nature of the mineralizing solutions, starting from information delivered by the study of the fluid inclusions, contents in rare earths of fluorites, contents in SFe and trace elements of blends, thermo-optical data concerning the latter, finally data concerning the distribution of fluorine in the collection; at the conclusion of these studies, a hypothesis on the formation and the age of the mineralization is proposed.
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Aurelio Ochoa Alencastre. Étude gîtologique des minéralisations fluorées du Massif du Rocheray, Savoie (Alpes françaises externes). Pétrographie. Université Claude Bernard - Lyon 1, 1979. Français. ⟨tel-02439915⟩

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