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Les pyroxénolites à amphibole et les amphibololites associées aux lherzolites du gisement de Lherz (Ariège, France): un exemple du rôle de l'eau au cours de la cristallisation fractionnée des liquides issus de la fusion partielle de lherzolites

Amphibole pyroxenites and amphibolites associated with lherzolites from Lherz: An example of the effect of water on the fractionation of liquids derived from partial melting of lherzolites

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Abstract

Amphibole pyroxenites with or without garnet and amphibolites (hydrous facies) which occur in the Lherz outcrop form monofacies or composite dykes cutting the primary schistosity of the spinel lherzolite. They coexist with monofacies or composite dykes of amphibole — free pyroxenites, with or without garnet (anhydrous facies), which are folded with the peridotite. The range of compositions, from olivine tholeiite (anhydrous facies only) to olivine basanites and nephelinites (hydrous facies) signifies a peculiar differenciation which could result from 1) fractionations closely controled by variation of the PH2O/Pt in liquids derived from partial melting of a peridotite originally containing a small amount of water. 2) tectonic features of the emplacement of the ultrabasic body up to the lower levels of the crust, during which residual liquids, increasingly undersatured and enriched in alkalies and titanium, have been segregated. The result of such a process is the formation of rocks (amphibolites) having a chemical composition close to that of some olivine melilitic nephelinites flows.

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  1. Laboratoire de Minéralogie, Muséum National d'Histoire Naturelle, Paris, France

    F. Conquéré

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Conquéré, F. Les pyroxénolites à amphibole et les amphibololites associées aux lherzolites du gisement de Lherz (Ariège, France): un exemple du rôle de l'eau au cours de la cristallisation fractionnée des liquides issus de la fusion partielle de lherzolites. Contr. Mineral. and Petrol. 33, 32–61 (1971). https://doi.org/10.1007/BF00373793

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