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Occurrence of phlogopite in the Finero Mafic layered complex

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Central European Journal of Geosciences

Abstract

Phlogopite-bearing lithologies are the main constituent of the Phlogopite-Peridotite unit of the Finero sequence and the result of pervasive migration of metasomatizing melts/fluids. Conversely, the presence of phlogopite within the associated Finero Mafic Complex, a mafic-ultramafic pluton intruded into the metamorphic basement of the Adria plate, is mentioned in literature as rare. Recent detailed fieldwork has evidenced the presence of two distinct phlogopite-rich ultramafic lithologies within the Amphibole-Peridotite unit of the Finero Mafic Complex, where phlogopite is always associated with amphibole. Field and petrographic features of these occurrences, as well as major- and trace-element mineral chemistry, are here presented to i) place constraints on the nature of the parent melt from which they have been generated and ii) to address their relationship with the other lithologies of the Finero Complex. We find that these rocks were formed by late melt migrations along shear zones under high-T conditions. The geochemical affinity of these lithologies is different to the tholeiitic-transitional affinity reported in literature for the Finero Mafic Complex. The enrichment in LREE, Th, U and Sr of the associated amphibole possibly suggests that these phlogopite-bearing lithologies are genetically related to the metasomatic events that have affected the Finero mantle massif.

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Authors and Affiliations

  1. Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Largo S. Eufemia 19, 41121, Modena, Italy

    Tommaso Giovanardi, Maurizio Mazzucchelli & Anna Cipriani

  2. Dipartimento di Scienze Della Terra e Dell’ambiente, Università degli Studi di Pavia, Via Ferrata 1, 27100, Pavia, Italy

    Tommaso Giovanardi

  3. Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 563, Cidade Universitária, 05508-900, São Paulo, Brazil

    Tommaso Giovanardi

  4. Istituto di Geoscienze e Georisorse-C.N.R. U.O.S. of Pavia, Via Ferrata 1, 27100, Pavia, Italy

    Maurizio Mazzucchelli, Alberto Zanetti, Antonio Langone & Massimo Tiepolo

  5. Lamont Doherty Earth Observatory of Columbia University, Palisades, New York, 10964, USA

    Anna Cipriani

Authors
  1. Tommaso Giovanardi
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  2. Maurizio Mazzucchelli
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  3. Alberto Zanetti
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  4. Antonio Langone
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  5. Massimo Tiepolo
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  6. Anna Cipriani
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Correspondence to Tommaso Giovanardi.

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Giovanardi, T., Mazzucchelli, M., Zanetti, A. et al. Occurrence of phlogopite in the Finero Mafic layered complex. cent.eur.j.geo. 6, 588–613 (2014). https://doi.org/10.2478/s13533-012-0186-8

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  • DOI: https://doi.org/10.2478/s13533-012-0186-8

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