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Title: Superposition relations of microfabrics in the northern hanging-wall block
Authors: Dias da Silva, Icaro F
Pereira, M Francisco
Silva, Jose B
Keywords: Gneiss dome
high- to low-grade mylonitization
D2 microfabrics
D3 microfabrics
Variscan Orogen
Issue Date: 2016
Publisher: Sociedad Geologica de Espana
Citation: Dias da Silva IF, Pereira MF, Silva JB, 2016. Superposition relations of microfabrics in the northern hanging-wall block. Geotemas 16:455-458 of the Évora Massif (Ossa-Morena Zone)
Abstract: This study reports alternation of D2 extension-related and D3 contraction-related microfabrics in the northern hanging wall block of a gneiss dome-like structure recognized in the Évora Massif (Ossa-Morena Zone). In the Arraiolos – Santo Antonio de Alcorrego traverse high- to low-grade mylonites are dominant. Microfabrics related to D2 ductile deformation and M2 high-amphibolite to greenschist facies characterize an extensional shear zone with telescoping metamorphic isograds. D2 microstructures indicate shear sense with top-to-SE. Superposition of D3 contraction developed under greenschist facies (M3) producing folding of D2 microfabrics, mylonitization of granites along strike-slip shear zones and retrogression of M2 mineral assemblages.
Type: lecture
Appears in Collections:GEO - Comunicações - Em Congressos Científicos Internacionais

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