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    40Ar–39Ar ages and isotope geochemistry of Cretaceous basalts in northern Madagascar: Refining eruption ages, extent of crustal contamination and parental magmas in a flood basalt province

    195623_97072_Cuniniello-GeolMag2013_Madagascar.pdf (1.836Mb)
    Access Status
    Open access
    Authors
    Cucciniello, C.
    Melluso, L.
    Jourdan, Fred
    Mahoney, J.
    Meisel, T.
    Morra, V.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Cucciniello, C. and Melluso, L. and Jourdan, F. and Mahoney, J.J. and Meisel, T. and Morra, V. 2013. 40Ar–39Ar ages and isotope geochemistry of Cretaceous basalts in northern Madagascar: Refining eruption ages, extent of crustal contamination and parental magmas in a flood basalt province. Geological Magazine. 150 (1): pp. 1-17.
    Source Title
    Geology Mag
    DOI
    10.1017/S0016756812000088
    ISSN
    1469-5081
    Remarks

    Copyright © 2012 Cambridge University Press 2012

    URI
    http://hdl.handle.net/20.500.11937/44742
    Collection
    • Curtin Research Publications
    Abstract

    The Madagascar Cretaceous igneous province exposed in the Mahajanga basin is represented by basalt and basaltic andesite lavas. New 40Ar–39Ar plateau ages (92.3 ± 2.0 Ma and 91.5 ± 1.3 Ma) indicate that the magmatism in the Mahajanga basin started about 92 Ma ago. Four geochemically distinct magma types (Groups A–D) are present. Group A and C rocks have low to moderate TiO2 (1.2–2.6 wt%), Nb (3–9 μg g−1) and Zr (82–200 μg g−1), and show large variations in ɛNdi (+0.1 to −10.8), 206Pb/204Pb (15.28 to 16.33) and γOs (+11.4 to +7378). The large isotopic variations, particularly in Os, Nd and Pb isotopic compositions, are likely due to crustal contamination. The low Pb isotope ratios observed in the Group A and C rocks suggest involvement of continental crust with low μ (238U/204Pb). Group B and D rocks have moderate to high TiO2 (2.2–4.9 wt%), Nb (8–24 μg g−1) and Zr (120–327 μg g−1). Age-corrected isotopes of Group B and D lavas show a small range in ɛNdi (+1.0 to +4.0) and a wide range in γOs (+128 to +1182). Values of 207Pb/204Pb are within the range for Groups A and C, but the Group D 206Pb/204Pb (16.52–17.08) and 208Pb/204Pb (37.51–38.01) values are higher, indicating a different crustal contaminant. Pb isotopic values of the Group B rocks seem to reflect the isotopic features of their mantle source. The magma groups of Mahajanga display a wide range of trace element and isotopic compositions that cannot be explained only by open-system crystallization processes but, rather, by distinct mantle sources.

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