The emplacement of the Late Miocene Monte Capanne intrusion (Elba Island,Central Italy): constraints from magnetic fabric analyses |
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Authors: | Email author" target="_blank">Francesca?CifelliEmail author Liliana?Minelli Federico?Rossetti Giorgia?Urru Massimo?Mattei |
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Institution: | 1.Dipartimento Scienze Geologiche,Università degli Studi di ROMA TRE,Rome,Italy;2.Istituto Nazionale di Geofisica e Vulcanologia,Rome,Italy |
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Abstract: | Anisotropy of magnetic susceptibility (AMS) analysis has been carried out in the thermometamorphic aureole surrounding the
Late Miocene Monte Capanne pluton (Elba Island, Central Italy). The identification and separation of the main carriers of
the magnetic susceptibility by low-temperature and high-field AMS measurements demonstrate that a correct knowledge of the
magnetic fabric is needed in order to use AMS for tectonic interpretations. Magnetic fabric data, combined with structural
data from the aureole, and their comparison with data from the pluton itself, were used to constraint the mode of pluton emplacement.
Results document an intimate linkage between the magmatic flow pattern and the syn-metamorphic fabrics acquired during pluton
emplacement in the host rocks. The magnetic/structural fabric in the aureole rocks is dominated by flattening deformation
and no systematic relationship with any regional tectonic feature is observed. These results suggest that local processes
induced by magma ascent in the upper crust might have played a primary role in space generation for pluton emplacement in
the Tuscan Magmatic Province, suggesting a revaluation of the modes of pluton emplacement during the post-orogenic evolution
of the northern Apennine system as a whole. |
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