Evidence for the Central Atlantic magmatic province (CAMP) in Precambrian and Phanerozoic sedimentary basins of the southern Amazonian Craton, Brazil

• Published in: Journal of South American earth sciences 2021-06, Vol.108, p.103216, Article 103216
• Main Authors: Rezende, Gabriel L., Martins, Cristiano Mendel, Nogueira, Afonso C.R., Domingos, Fabio Garcia, Ribeiro-Filho, Nelson
• Format: Article
• Language: English
• Subjects: Amazonian craton; Araras-alto Paraguay Basin; Gravity modelling; Jurassic-triassic; Large igneous provinces; Parecis basin; Residual gravity field
• ISSN: 0895-9811; 1873-0647
• DOI: 10.1016/j.jsames.2021.103216

The Triassic-Jurassic emplacement of large volumes of basaltic rocks termed the Central Atlantic magmatic province (CAMP), preceded the Pangea break-up and the opening of the Central Atlantic Ocean. Central Brazil is an important site where the CAMP record can be assessed in detail. Previously mapped basalts in this region, which includes southwestern Tocantins and southern Tapajós provinces represent a volume of 0.19 million km3. Interpretations of existing geophysical and geological data combined with forward gravity modelling were carried out in the Paleozoic Parecis and late Cryogenian-Cambrian Araras-Alto Paraguay basins. This study allows a new interpretation of geologic structures from residual gravity anomalies in the southern Amazonian Craton. Additionally, the basalts exposed in these basins occur as lava flows, sills and dykes hosted in Neoproterozoic and Paleozoic rocks, presenting an estimated subsurface magma volume of 3 million km3. Moreover, these geological elements are interpreted as high-density rocks correlated to the continental tholeiitic flood basalts of the CAMP. Therefore, the combination of residual gravity anomalies and previous geological data verifies the CAMP occurrence in these sedimentary basins of Amazonia. •Study and record of poorly known CAMP basalts in subsurface at the Central Brazil.•Gravity modelling using Satellites data and 3D rectangular prisms discretization.•Obtaining of residual gravimetric anomaly in the South Amazonian Craton from the Crustal Modelling. .•CAMP volume estimation in subsurface from the correlation of gravimetric and geological data study.•Tectonic and magmatic evolution of the CAMP basalts in the South Amazonian Craton.