An exposed Hercynian deep crustal section in the Sila Massif of northern Calabria; mineral chemistry, petrology and a P-T path of granulite-facies metapelitic migmatites and metabasites

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doi: 10.1093/petrology/42.5.931
Authors:Graessner, Thorsten; Schenk, Volker
Author Affiliations:Primary:
Christian-Albrechts-Universität zu Kiel, Institut für Geowissenschaften, Kiel, Federal Republic of Germany
Volume Title:Journal of Petrology
Source:Journal of Petrology, 42(5), p.931-961. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:2001
Note:In English. 70 refs.; illus., incl. 9 tables, geol. sketch maps
Summary:The Sila massif of N Calabria, S Italy, exposes the lowermost part of a tilted cross-section through the Hercynian continental crust. Metapelitic migmatites with metabasites and marbles were metamorphosed at medium-P-high-T granulite-facies conditions with a continuous metamorphic gradient through the exposed segment. This is revealed by geothermobarometry, the TWEEQU method of Berman and by dehydration melting reactions which reveal 4 kbar at 740°C at the top and 6 kbar at 770°C at the base of the section, indicating 14-21 km depth range at peak T. Reaction textures with some excellent microphotographs, show the prograde P-T path was in the sillimanite field, the retrograde path involved isothermal uplift and then near-isobaric cooling to greenschist facies. As in S Calabria, large granitic bodies giving major advective heat input, were emplaced between the granulite-facies lower crust ('Monte Gariglione complex') and the amphibolite to greenschist-facies upper crust during regional metamorphism. Chemical analyses of garnets, biotites, cordierites, plagioclases, orthopyroxenes, hornblendes and cummingtonites are listed. [B.E.L.]
Subsections:Metamorphism: regional, dynamic
Subjects:Crust; Facies; Granulite facies; Hercynian Geosyncline; Lower crust; Metabasite; Metaigneous rocks; Metamorphic rocks; Metapelite; Metasedimentary rocks; Migmatites; P-T-t paths; Calabria Italy; Europe; Italy; Sila Massif; Southern Europe
Coordinates:N380000 N401000 E0170000 E0154500
Abstract Numbers:01M/4686
Record ID:2002003066
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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