CONICET | Buscador de Institutos y Recursos Humanos

This work is the result of a multiyear effort to usefield geology to describe lithologies, to establish contact relationshipsand to create a sketch of the tectonic evolution of the Meso- to Neoproterozoicmetasedimentary successions within the Schist Belt ofthe Dom Feliciano Belt. This low-grade metamorphic cover restson the high-grade metamorphic basement of the La China andLas Tetas complexes. This basement is Archean-Paleoproterozoicin age. The Schist Belt is overlapped unconformably by the BarrigaNegra formation. The Lavalleja complex and the Barriga Negraformation both deformed together during the D2 deformation event(~ 570 ?540 Ma), but the Barriga Negra only partially recorded theD2 transpressive event, whereas the Lavalleja complex was affectedby both the D1 tangential event and the D2 event. Event D1 wouldhave developed a fold nappe with vergence to the south. This hypothesisis supported by different structures: (i) recumbent and uprightfolds oriented E-W, (ii) subhorizontal mylonitic foliation in marbles(calc-schists), (iii) stretching lineations plunging towards the SW inmetaconglomerates of the Las Tetas Complex, and (iv) a reworkingof the subhorizontal foliation parallel to the Sarandí del Yí strike-slipshear zone.