02558nab a2200205 4500 20260520000323.0 260224s2015 xxu ing Inglés Precambrian-Pleistocene tectono-stratigraphic evolution of the southern Llanos basin, Colombia ago. 2015 17/10/2017 ; 17/10/2017 28 p. ; 1473-1501 Transcripción del resumen del autor: The Llanos basin, located in the eastern region of Colombia, northwestern South America, is an Andean foreland basin between the Eastern Cordillera (Colombian Andes) and the Guyana Previous HitPrecambrianNext Hit shield. The basin is the latest stage of a complex multiphase evolution that began in the Paleozoic at the latest. A Paleozoic–Previous HitPleistoceneNext Hit basin evolution model is presented based on a regional, two-dimensional, industry seismic data set and well-log observations for the southern part of the basin. Five Previous HittectonoNext Hit-stratigraphic sequences were identified: (1) lower Paleozoic depocenters preserved along inverted Neoproterozoic basement blocks; (2) an upper Paleozoic marine sequence folded and faulted in the late Paleozoic during assembly of Pangea; (3) Upper Cretaceous–Paleocene shallow marine sediments deposited in a distal foreland basin related to uplift of the Western and Central Cordilleras of Colombia, the sequence pinches out against a Paleozoic hinge or foreland bulge area; (4) an Eocene–Miocene foreland basin related to uplift of the Eastern Cordillera resulting in a wedge geometry; and (5) Pliocene–Previous HitPleistoceneNext Hit fluvial deltaic rocks overfilling the foreland basin. Reactivation of Paleozoic structures occurs at the top of this sequence with the development of anticlinal structures. Present-day stress fields indicate that subduction of the Nazca plate beneath South America may be responsible for reactivation of Paleozoic structures. Inversion of north–south structures with the Neoproterozoic basement is interpreted to be responsible for the Paleozoic and Previous HitPleistoceneTop deformation, whereas Cenozoic deformation is related to the two main stages of foreland development of the basin. To the east, where the Paleoproterozoic basement is present, no deformation is interpreted. 8 AAPG Bulletin ARTICULO Moreno-López, Maria Catalina 57391 Escalona, Alejandro 48454 191354 191354 0 0 0 0 259173 BAAB BAAB 2026-03-06 200063629 0 200063629 2026-03-06 00:21:56 2026-03-06 ARTICULO