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Time–space relationships among structural and metamorphic aureoles related to granite emplacement: a case study from the Serre Massif (southern Italy)

Published online by Cambridge University Press:  16 November 2012

VINCENZO FESTA ,
ALFREDO CAGGIANELLI ,
ANTONIO LANGONE  and
GIACOMO PROSSER
VINCENZO FESTA*
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari ‘Aldo Moro’, Via E. Orabona 4, 70125 Bari, Italy
ALFREDO CAGGIANELLI
Affiliation:
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari ‘Aldo Moro’, Via E. Orabona 4, 70125 Bari, Italy
ANTONIO LANGONE
Affiliation:
CNR-IGG (Consiglio Nazionale della Ricerche–Istituto di Geoscienze e Georisorse) Pavia, Via Ferrata 1, 27100 Pavia, Italy
GIACOMO PROSSER
Affiliation:
Dipartimento di Scienze, Università degli Studi della Basilicata, Campus di Macchia Romana, 85100 Potenza, Italy
*
†Author for correspondence: [email protected]
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Abstract

Tectonic and thermal perturbations, related to emplacement of granodiorite in the upper continental crust, have been investigated in the late-Hercynian basement exposed in southern Calabria (Italy). Here, the structural aureole is marked by the presence of a major rim fold adjacent to the intrusive contact for a length of at least 20 km. Geometrical analysis of the structural aureole and related foliations, lineations and crenulations reveals that the perturbed zone is at least 3000 m wide and characterized by an open synform trending nearly parallel to the intrusive contact. This pattern is compatible with a laccolith-like mode of magma emplacement, related to the accretion of the pluton that shouldered weak phyllitic and slaty wall rocks. The metamorphic aureole, about 1800 m wide, is characterized by biotite, cordierite and andalusite that appear sequentially in spotted schists and hornfelses approaching the intrusive contact. The peak assemblage equilibrated between 535 and 590°C at pressures between 175 and 200 MPa, confirmed by Al-in-hornblende barometry on granodiorite. Microstructural analysis allowed the inference of a time lag between the thermal and tectonic perturbations. With the aid of thermal modelling it was possible to quantify the time required to reach the peak temperature at a distance from the intrusive contact where cordierite spots and andalusite porphyroblasts clearly overprint crenulations. This estimate represents the time limit to accomplish deformation in the inner portion of the aureole and thus indicates a minimum strain rate of 4 × 10−14 s−1 within the country rocks during granodiorite intrusion.

Keywords

host rockdeformationrim foldsupper crustcontact metamorphismthermal modelling
Type
Original Articles
Information
Geological Magazine , Volume 150 , Issue 3 , May 2013 , pp. 441 - 454
Copyright
Copyright © Cambridge University Press 2012

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