The Halogen budget of Bolivian mafic shoshonites

M. J. Pankhurst, N. Jimenez, B. F. Schaefer, S. P. Turner

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    The halogen budget of the shoshonitic series of the Bolivian Altiplano has been assessed, and found that they have contents similar to other enriched basalts worldwide. We observe F (range between 0.02 and 0.24 wt%) behaviour as similar to that of crustal derived elements in this environment, while Cl (range between 0.01 and 0.26 wt%) is more complex and probably is controlled by heterogenous source regions. F and Cl both decrease in abundance towards the more evolved end of the series that, despite large distances (~300 km) between the furthest samples, bear a striking similarity in numerous geochemical indices. It follows that the lack of F in Bolivian Sn-systems is due to petrogenetic process rather than parental material. A model involving amphibole fractionation promoted by the anomalously thick crust is proposed to account for these observations.
    Original languageEnglish
    Pages (from-to)5-14
    Number of pages10
    JournalRevista brasileira de geociências : órgão da Sociedade Brasileira de Geologia
    Issue number4
    Publication statusPublished - 2012


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