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Geology of the Variscan basement of the Laconi-Asuni area (central Sardinia, Italy): the core of a regional antiform refolding a tectonic nappe stack

Funedda, Antonio and Meloni, Alessio Mattia and Loi, Alfredo (2015) Geology of the Variscan basement of the Laconi-Asuni area (central Sardinia, Italy): the core of a regional antiform refolding a tectonic nappe stack. Journal of Maps, Vol. 11 (1), p. 146-156. eISSN 1744-5647. Article.

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DOI: 10.1080/17445647.2014.942396

Abstract

The study area extends in central Sardinia between the coordinates 8°56′00″/39°55′00″ (NW corner) and 9°03′00″/39°50′00″ (SE corner). It forms part of the Sardinian Variscides that are characterized here by the western-most aspect of a regional structure known as the Flumendosa Antiform, which runs ENE-trending for more than 50 km along its axis. It represents the envelopment of several, upright km-scale minor folds that refold the different tectonic units of the Variscan Nappe zone characterized by a number of isoclinal folds, with axial plane foliation and thick ductile shear zones. The antiform is in turn deformed by late-orogenic extensional structures, namely asymmetric folds and narrow, low angle ductile shear zones that generally reactivate earlier collisional structures. The 1:12,500 scale map completes the mapping of this important regional structure, meaning that a detailed survey of the entire mega-structure is now available. This enables more detailed structural analyses of poly-deformed areas in low-grade metamorphic conditions to be conducted, given the robust knowledge available of the lithostratigraphic succession and the geometric and kinematic outlines.

Item Type:Article
ID Code:10009
Status:Published
Refereed:Yes
Uncontrolled Keywords:Variscan orogenesis, north-Gondwana, regional antiform, nappe zone, polyphasal deformation, structural map, Sardinia
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/14 Pedologia
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Taylor & Francis
eISSN:1744-5647
Deposited On:07 Aug 2014 09:12

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