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Orogen-parallel tectonic transport in the Variscan Belt of northern Sardinia (Italy); implications for the exhumation of medium-pressure metamorphic rocks

Rodolfo Carosi and Rosaria Palmeri
Orogen-parallel tectonic transport in the Variscan Belt of northern Sardinia (Italy); implications for the exhumation of medium-pressure metamorphic rocks
Geological Magazine (September 2002) 139 (5): 497-511

Abstract

A transpressive crustal-scale dextral shear zone is documented in the Variscan basement of NE Sardinia. It indicates the presence of a shear deformation parallel to the belt overprinting previous structures related to nappe stacking and top-to-the-S and -SW thrusting. The stretching lineation points to an orogen-parallel stretching and to a general change in the tectonic transport. Phase D1 developed during initial frontal collision, whereas the D2 deformation was characterized by dextral shearing during the increasing curvature of the Ibero-Armorican arc. Transpressional deformation developed in a regime of decreasing P, causing telescoping of the Barrovian isograds and the exhumation of the low- to medium-grade metamorphic rocks. In this sector of the Variscan belt, exhumation is due to continuing compression with an increasing component of horizontal displacement. The overall change of the shortening direction in a large sector of an orogenic belt, with the occurrence of increasing orogen-parallel displacement, may be regarded as a general mechanism affecting the exhumation of rocks and preventing the thickened collisional crust from undergoing a generalized gravitational collapse.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 139
Serial Issue: 5
Title: Orogen-parallel tectonic transport in the Variscan Belt of northern Sardinia (Italy); implications for the exhumation of medium-pressure metamorphic rocks
Affiliation: CNR, Istituto di Geoscienze e Georisorse, Pisa, Italy
Pages: 497-511
Published: 200209
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 59
Accession Number: 2003-025961
Categories: Structural geologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N39°49'60" - N40°30'00", E08°15'00" - E09°45'00"
Secondary Affiliation: Museo Nazionale dell'Antartide, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200309
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