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|Title: ||Retrograded Eclogites and Gold Mineralization in the Tomar-Córdoba Shear zone at Algueireiras-Algueireirinhas (Assumar)|
|Authors: ||Pinto, Luis|
Tomar-Cordoba Shear Zone
|Issue Date: ||2006|
|Abstract: ||In NE Alentejo, the < 1 - 3 km–wide WNW-ESE-striking Tomar-Córdoba Shear Zone (s.s.) includes Proterozoic, blastomylonitic ortho-, para-gneissic migmatites and (retrograded) eclogites. To the north and south of this belt, the outcropping Late Proterozoic Black Series comprises meta-sedimentary and meta-volcanic rocks that, locally, host orogenic (mesothermal) gold mineralizations. Both the Tomar-Córdoba Shear Zone and the Black Series rocks are intruded by Late Ordovician peralkaline granitic and syenitic gneisses.
Deformation/metamorphism occurred during the Variscan orogeny and was, probably, superimposed on former Proterozoic (Cadomian?) events. A Variscan asymmetrical flower structure with outward vergence is centered on the Tomar-Córdoba Shear Zone. This major structure is transpressive, with left-lateral shear and outward thrusts over the Black Series rocks.|
|Appears in Collections:||GEO - Comunicações - Em Congressos Científicos Nacionais|
CGE - Comunicações - Em Congressos Científicos Nacionais
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