High-resolution stratigraphy and sedimentary evolution of coarse- grained canyon-filling turbidites from the Upper Cretaceous transgressive megasequence, Campos Basin, offshore Brazil

Coniacian to Lower Maastrichtian coarse-grained turbidites fill intra-slope, fault-controlled canyons in the Campos Basin, offshore Brazil. They form part of an Upper Albian to Lower Paleocene transgressive succession characterized by onlapping, deepening-upward sedimentation throughout the eastern Brazilian margin. In the Carapeba and Pargo (CRP-PG) oil fields the turbidites consist mainly of graded beds without any other sedimentary structures. Use of 92 density logs calibrated with 13 cores permitted the mapping of 198 coarse-grained turbidites in the CRP-PG turbidite system. The turbidites form eight thinning- and fining-upward facies successions, some bounded by regional unconformities or local erosion surfaces. Turbidites in the CRP-PG area were probably deposited during falls of relative sea level that punctuated the overall transgressive setting of the late Cretaceous and early Tertiary. -from Authors