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    Petrogenesis of tholeiitic basalts from the Central Atlantic magmatic province as revealed by mineral major and trace elements and Sr isotopes

    Access Status
    Fulltext not available
    Authors
    Marzoli, A.
    Jourdan, Fred
    Bussy, F.
    Chiaradia, M.
    Costa, F.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Marzoli, Andrea and Jourdan, Fred and Bussy, Francois and Chiaradia, Massimo and Costa, Fidel. 2013. Petrogenesis of tholeiitic basalts from the Central Atlantic magmatic province as revealed by mineral major and trace elements and Sr isotopes. Lithos (188): pp. 44-59.
    Source Title
    Lithos
    DOI
    10.1016/j.lithos.2013.09.013
    ISSN
    0024-4937
    URI
    http://hdl.handle.net/20.500.11937/36091
    Collection
    • Curtin Research Publications
    Abstract

    The petrogenesis of the Kerforne dyke tholeiitic basalts (Brittany, France), the northernmost outcrop of the 200 Ma Central Atlantic magmatic province (CAMP), is constrained by its zoned augite and plagioclase crystals. Augite cores with high Mg/Fe and Cr suggest crystallization from near-primary magmas, with slightly enriched Rare Earth element (REE) patterns. Plagioclase crystals with high-An (An85) rounded cores are MgO- and K-rich, REE-poor, and display 87Sr/86Sr200Ma (0.7058) significantly higher than those of the surrounding ground-mass (0.7052–0.7053) suggesting open-system evolution processes. We propose a differentiation process involving mixing of different mafic magmas which occurred in less than a few hundred years judging from the lack of diffusive re-equilibration of major and trace elements in augite and of 87Sr/86Sr200Ma in plagioclase cores. The relatively large range of incompatible element contents and ratios of observed and calculated magmas are possibly due to fractional crystallization and to moderate amounts of crustal contamination which affected the more primitive magmas in particular. The calculated magmas reach near-primitive compositions and suggest that they originated from melting of a spinel peridotite slightly enriched in LREE vs. HREE.

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