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The Sondalo gabbro contact aureole (Campo unit, Eastern Alps): implications for mid-crustal mafic magma emplacement

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Abstract

Contact aureoles rimming plutonic rocks are the locus of metamorphism and deformations witnessing magma emplacement mechanisms in the crust. In this study, structural and petrological observations are combined to mineral equilibria modelling to unravel the polyphase tectono-metamorphic history of the Permian Sondalo gabbro and its host rock, the Campo unit (Eastern Alps). The Campo unit consists of Grt–St–Ms–Bt–Pl–Qtz ± Sil ± And ± Crd mica schists attesting of a Carboniferous prograde P–T path, reaching 6 kbar/600 °C and subsequently 5.6 kbar/650 °C. This metamorphism is coeval with the formation of a sub-vertical NE–SW trending foliation (S1) and its overprint by a sub-vertical NW–SE trending foliation (S2). The heat brought by the Permian intrusives subsequently caused heating of the Campo unit at around 3–4 kbar/540 °C reflected by regional static crystallization of cordierite and andalusite porphyroblasts. During the intrusion of the Sondalo gabbro, thermal peak conditions are recorded by Grt–Sil–Spl–Crd–Ilm granulitic xenoliths at ~5.5 kbar/930 °C, subsequently exhumed at ~4 kbar during the development of a new foliation (S3). This foliation is localized around the pluton and moderately dips away from the centre of the pluton. In the migmatitic contact aureole, Grt–Sil–Bt–Pl–Qtz–Ilm and Grt–Sil–Crd–Spl–Bt–Kfs–Ilm residual rocks bear the new foliation (S3) and document a decompression from 6 kbar/750 °C to 5 kbar/725 °C and from 5.2 kbar/800 °C to reach 4.8 kbar/770 °C, respectively. The P–T–d paths recorded by the host rock and the xenoliths point to a two-step magma emplacement. First the Sondalo gabbro intruded the Campo unit causing heating of the host rock without deformation at 3–4 kbar. Second, the ductile flow along the pluton margins developed a new foliation (S3) during exhumation of the pluton and its immediate contact aureole from 6 to 4 kbar. Altogether, it indicates a progressive increase in mechanical coupling between the pluton and the host rock during magma emplacement.

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Acknowledgments

We acknowledge J.C. Corona, T. Theye and G. Morvan for guidance on microprobe from Amsterdam, Stuttgart and Strasbourg, respectively. E. Skrzypek and R.F. Weinberg are thanked for informal comments and discussions, R. White and R. Braga for comments on the initial version of the manuscript. The article benefited from reviews from B. Cesare, an anonymous reviewer and from O. Müntener as editor.

Funding

Field work and analyses have been financed by an ExxonMobil research grant to G. Manatschal.

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Authors and Affiliations

  1. Ecole et Observatoire des Sciences de la Terre, Institut de Physique du Globe de Strasbourg - CNRS UMR7516, Université de Strasbourg, 1 rue Blessig, 67084, Strasbourg Cedex, France

    B. Petri, P. Štípská, K. Schulmann & G. Manatschal

  2. Département Géosciences et Environnement, Université de Cergy-Pontoise, 5, mail Gay Lussac, Neuville-sur-Oise, 95031, Cergy-Pontoise Cedex, France

    G. Mohn

  3. Center for Lithospheric Research, Czech Geological Survey, 11821, Prague 1, Czech Republic

    P. Štípská & K. Schulmann

Authors
  1. B. Petri
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  2. G. Mohn
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  3. P. Štípská
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  4. K. Schulmann
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  5. G. Manatschal
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Correspondence to B. Petri.

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Additional information

Communicated by Othmar Müntener.

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Petri, B., Mohn, G., Štípská, P. et al. The Sondalo gabbro contact aureole (Campo unit, Eastern Alps): implications for mid-crustal mafic magma emplacement. Contrib Mineral Petrol 171, 52 (2016). https://doi.org/10.1007/s00410-016-1263-7

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