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Pyroxene-pyrolite and plagioclase-pyrolite in inclusions, with Norites, in an Alkali Basalt (Causses, France)

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Abstract

In three representative nodules contained in an alkali-olivine basalt, a succession of cumulate cycles has been noted:

$$\begin{gathered} 1) olivine - orthopyroxene + \varepsilon (Cpx + Sp.); \hfill \\ 2) ortho - clinopyroxene + \varepsilon (Ol. + Sp. + Plag); \hfill \\ 3) ortho - clinopyroxene + Plag + \varepsilon (Ol. + Sp.). \hfill \\ \end{gathered} $$

The element distribution in the minerals enables us to say that these mafic and ultramafic nodules formed near the stability line of plagioclase at about 10 kb. These cumulates, which belong to a comagmatic series, from picrites to basalts, were formed in the upper mantle. They are associated with norites — Plag. + Opr. + Cpx. +≡ (Il. + Bi) — belonging to the same series, but crystallized in the deep part of the crust. On the other hand, these norites could be xenoliths taken away from an infragranitic basement of granulite facies.

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Author notes

  1. J. P. Ildefonse

    Present address: Laboratoire de Géochimie, Faculté des Sciences, 45 -Orléans - La Source

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  1. Laboratoire de Volcanologie-Pétrologie, Faculté des Sciences, Orsay (91)

    R. Brousse & J. P. Ildefonse

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  1. R. Brousse
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Paper read byJ. Varet at the Symposium «Volcanoes and Their Roots», Oxford, England, Sept. 1969.

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Brousse, R., Ildefonse, J.P. Pyroxene-pyrolite and plagioclase-pyrolite in inclusions, with Norites, in an Alkali Basalt (Causses, France). Bull Volcanol 34, 792–822 (1970). https://doi.org/10.1007/BF02596802

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