Upper Oligocene-Miocene deposits of Eastern Amazonia: Implications for the collapse of Neogene carbonate platforms along the coast of northern Brazil

Mixed carbonate-siliciclastic platforms developed in the onshore and offshore zones of several basins along Amazonian coast starting Palaeocene. The shutdown Miocene carbonate accumulation distinct tectonic settings shows different evolutionary histories Eastern coast. has been attributed to abundant siliciclastic fluvial inflow from Andean Amazon River during late Miocene. combination previously collected geological information new stratigraphic data Oligocene-Miocene transgressive-regressive Pirabas-Barreiras sequence exposed on Bragantina Platform reveals collapse platform by Barreiras fan delta deposits middle development delta, fed a cratonic source Langhian (15–10 Ma) sea-level fall, was concomitant with so-called Cratonic that preceded transcontinental River. climax fall caused maximum expansion which reached Marajó Pará-Maranhão basins. progressive denudation region, low inflow, extensive Tortonian (11–8 resulted inactivity Delta. Consequently, exposure subsequent intense lateritization these degraded generated an unconformity lasted until deposition Pleistocene Post-Barreiras sediments.