The Lago della Vecchia-Valle d’Irogna rocks are part of the Eclogitic Micaschists Complex (EMC) of the Sesia-Lanzo Zone, western Austroalpine domain. The 1:10,000 scale map includes metaintrusive, minor micaschist, banded gneiss, and metabasic boudins. The multiscale structural analysis reveals successive magmatic and tectono-metamorphic stages: during M0 the metaintrusive protoliths emplaced; D1 took place under eclogite-facies conditions; during D2 stage, a pervasive foliation developed under retrograde blueschist-facies conditions; D3–D4 and D5 structures developed under greenschist-facies conditions; during M6 andesitic dykes intruded. The mapped degree of fabric evolution (FE) and metamorphic transformation (MT) related to D2-foliation shows that the MT was not only controlled by bulk rock and mineral compositions, but also by FE. The development of a pervasive blueschist-facies D2-foliation is in contrast with the eclogitic dominant fabric generally recorded in the EMC. This difference suggests that FE and MT are potentially responsible for km-scale heterogeneities in the tectono-metamorphic record.
Analysis of fabric evolution and metamorphic reaction progress at Lago della Vecchia-Valle d’Irogna, Sesia-Lanzo Zone, Western Alps / L. Corti, G. Alberelli, D. Zanoni, M. Zucali. - In: JOURNAL OF MAPS. - ISSN 1744-5647. - 13:2(2017 Jun 15), pp. 521-533.
|Titolo:||Analysis of fabric evolution and metamorphic reaction progress at Lago della Vecchia-Valle d’Irogna, Sesia-Lanzo Zone, Western Alps|
CORTI, LUCA (Primo) (Corresponding)
ZANONI, DAVIDE (Penultimo)
ZUCALI, MICHELE (Ultimo)
|Parole Chiave:||Multiscale structural analysis; fabric evolution; metamorphic transformation progress; petro-structural mapping; blueschist-facies condition; Austroalpine|
|Settore Scientifico Disciplinare:||Settore GEO/03 - Geologia Strutturale|
|Data di pubblicazione:||15-giu-2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1080/17445647.2017.1331177|
|Appare nelle tipologie:||01 - Articolo su periodico|