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Igneous scapolite-bearing associations in the Chaîne des Puys, Massif Central (France) and Atakor (Hoggar, Algeria)

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Abstract

A scapolite+amphibole+clinopyroxene+Fe-Ti oxide+apatite association has been found as megacrysts in tephra from the Enval-Volvic volcanic line, east of the Chaîne des Puys (Massif Central, France) and in the cinder cone of the Segueïka volcano (Atakor, Algeria). In both kinds, lavahosts are basanites. Although never seen together in a single xenolith, a study of their inclusions indicates close genetic relationship between all 5 phases. This association must be considered as a paragenesis that crystallized within a narrow PT range. Volcanological, petrological and geochemical data suggest that these megacrysts are high-pressure phenocrysts rather than mechanically desintegrated fragments derived from coarse rocks. The composition of the amphibole suggests a pressure between 5 and 15 kb; Fe-Ti oxides imply a temperature close to 1,100° C.

Crystallization of sulfur-rich scapolite involves a high fSO3, and therefore a high fO2, remarkable for such relatively undifferenciated alkalic magmas. Coexisting Fe-Ti oxides indicate a fO2 close to 10−6 bar. Such conditions imply that H2O was a major component of the gaseous phase. This high water content can be explained in terms of derivation from an hydrated upper mantle source. This is in agreement with other petrological evidences indicating that the basic magmas of the Massif Central crystallized under high fSO3 conditions.

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  1. Département de Géologie et Minéralogie, Laboratoire associé n∘ 10 CNRS et Université et I.O.P.G., 5, rue Kessler, F-63038, Clermont-Ferrand Cedex, France

    P. Boivin & G. Camus

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Boivin, P., Camus, G. Igneous scapolite-bearing associations in the Chaîne des Puys, Massif Central (France) and Atakor (Hoggar, Algeria). Contr. Mineral. and Petrol. 77, 365–375 (1981). https://doi.org/10.1007/BF00371565

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