1 research outputs found
Preandean geological configuration of the eastern North Patagonian Massif, Argentina
The Preandean geological configuration of the eastern North Patagonian Massif is established through the use of geological and geophysical analysis. The positive gravity anomalies located near the Atlantic coast are due to 535 and 540 Ma old rocks belonging to the Pampean Orogeny (Precambrianâmiddle Cambrian), which are widely recognized in central and northern Argentina. The Famatinian Cycle (OrdovicianâDevonian) is represented by a SilurianâDevonian marine basin equivalent to those of eastern-central Argentina and South Africa, and which was deformed at the end of the Devonian by an âŒEâW to WNWâESE compressional event, part of the Famatinian Orogeny. Containing strong gravity gradients, the NWâSE belt is coincident with fault zones which were originated during the Gondwanide Orogeny. This event also produced NWâSE overthrusting of the SilurianâDevonian sequences and strike-slip faults that displaced blocks in the same direction. This deformation event belongs to the Gondwanide Orogeny that includes movements related to a counterclockwise rotation of blocks in northern Patagonia. The strong negative anomalies located in the western part of the area stem from the presence of rocks of the Jurassic CañadĂłn Asfalto basin interbedded in the Marifil Complex. These volcaniclastic sequences show mild deformation of accommodation zones in a pre-Jurassic paleorelief.Fil: Gregori, Daniel Alfredo. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico BahĂa Blanca. Instituto GeolĂłgico del Sur; Argentina. Universidad Nacional del Sur; ArgentinaFil: Kostadinoff, Jose. Universidad Nacional del Sur. Departamento de FĂsica; ArgentinaFil: Alvarez, Guillermina Telma. Universidad Nacional del Sur; ArgentinaFil: Raniolo, Luis Ariel. Universidad Nacional del Sur; ArgentinaFil: Strazzere, Leonardo. Universidad Nacional del Sur. Departamento de IngenierĂa; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico BahĂa Blanca. Instituto GeolĂłgico del Sur; ArgentinaFil: Martinez, Juan Cruz. Universidad Nacional del Sur; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico BahĂa Blanca. Instituto GeolĂłgico del Sur; ArgentinaFil: Barros, Mercedes Virginia. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico BahĂa Blanca. Instituto GeolĂłgico del Sur; Argentina. Universidad Nacional del Sur; Argentin