GEOLOGICAL AND STRATIGRAPHIC CHARACTERIZATION OF THE REGION NORTH OF INAJÁ (PE), JATOBÁ BASIN, NORTHEAST BRAZIL

Abstract

This paper presents the results of the geological mapping on a 1:50,000 scale of an area of 100 km2 in the Jatobá Basin, north of the municipality of Inajá, in the interior of Pernambuco state, northeastern Brazil. The stratigraphic units have great lithological similarity, requiring detailed studied to distinguish them. The petrographic analyzes allowed the monitoring of lithological and particle size transitions of the depositional systems that configure the syneclises, early rift and rift stages. The biostratigraphical studies made it possible to identify three ostracode biozones for the studied basin: RT-001 (Aliança Formation), RT-003 (Candeias Formation) and RT-004 to RT-007 (Ilhas Group), determining the biochronostratigraphical dating of the units based on non-marine ostracodes in the Dom João (Tithonian), Rio da Serra (Berriasian–Hauterivian), Aratu (Hauterivian–late Barremian) and early Buracica (Barremian) local stages. The data obtained resulted in the updating of the stratigraphic chart of the Jatobá Basin.