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    The role of fractional crystallization and late-stage peralkaline melt segregation in the mineralogical evolution of Cenozoic nephelinites/phonolites from Saghro (SE Morocco)

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    Authors
    Berger, J
    Ennih, N
    Mercier, J.C.C
    Liégeois, J.P.
    Demaiffe, D
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    Discipline
    Earth and related Environmental sciences
    Subject
    Geodynamics and mineral resources
    Audience
    Scientific
    Date
    2009
    Metadata
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    Description
    The Saghro Cenozoic lavas form a bimodal suite of nephelinites (with carbonatite xenoliths) and phonolites emplaced in the Anti-Atlas belt of Morocco. Despite the paucity of samples with intermediate composition between the two main types of lava (only one phonotephrite flow is reported in this area), whole-rock major element modelling shows that the two main lithologies can be linked by fractional crystallization. The most primitive modelled cumulates are calcite-bearing olivine clinopyroxenites, whereas the final stages of differentiation are characterized by the formation of nepheline-syenite cumulates. This evolution trend is classically observed in plutonic alkaline massifs associated with carbonatites. Late-stage evolution is responsible for the crystallization of hainite- and delhayelite-bearing microdomains, for the transformation of aegirine-augite into aegirine (or augite into aegirine-augite), and for the crystallization of lorenzenite and a eudialyte-group mineral as replacement products of titanite. These phases were probably formed, either by crystallization from late residual peralkaline melts, or by reaction of pre-existing minerals with such melt, or hydrothermal peralkaline fluid.
    Citation
    Berger, J; Ennih, N; Mercier, J.C.C; Liégeois, J.P.; Demaiffe, D (2009). The role of fractional crystallization and late-stage peralkaline melt segregation in the mineralogical evolution of Cenozoic nephelinites/phonolites from Saghro (SE Morocco). , Mineralogical Magazine, Vol. 73, 59-82, DOI: 10.1180/minmag.2009.073.1.59.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/466
    doi: http://dx.doi.org/10.1180/minmag.2009.073.1.59
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
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