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Origine mantélique des benmoreites de Moorea (Iles de la Societé, Pacifique)

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Abstract

Lavas from Moorea form two groups of about the same volumetric importance: a basalt hawaiite group and a mugearite benmoreite trachyte group.

Although more differentiated, the rocks of the second group cannot be related to the first by simple fractional crystallization. A model of fractional fusion or the same mantle source may explain the relationship between the two groups. The primary magmas generated by fractional fusion were subsequently modified by low pressure fractionation.

Resume

Les laves de l’ile de Moorea constituent deux groupes à peu près également représentés: celui des basaltes-hawaiites et celui des mugearites-benmoreites-trachytes.

Cette dualité pétrographique confirmée par les analyses minéralogiques et géochimiques ne peut être le résultat d’un simple processus de cristallisation fractionnée. Il est montré qu’il s’agit plutôt de deux séries nées d’une fusion fractionnée du mantenau aboutissant à la formation d’au moins deux liquides homogènes. Ultérieurement, à basse pression chacun des deux liquides se différencie.

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Authors and Affiliations

  1. Laboratoire de Pétrographie-Volcanologie, Université Paris Sud., 91405, Orsay Cedex, France

    F. Blanchard

  2. Laboratoire de Pétrographie, Université des Sciences et Techniques du Languedoc, 34060, Montpellier Cedex, France

    J. M. Liotard

  3. Laboratoire de Pétrographie-Volcanologie, Université Paris Sud., 91405, Orsay Cedex, France

    R. Brousse

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  1. F. Blanchard
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Blanchard, F., Liotard, J.M. & Brousse, R. Origine mantélique des benmoreites de Moorea (Iles de la Societé, Pacifique). Bull Volcanol 44, 691–710 (1981). https://doi.org/10.1007/BF02597092

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