Lithosphere density structure of southeastern South America sedimentary basins from the analysis of residual gravity anomalies

We conduct a gravity study of the lithosphere beneath three large sedimentary basins in southeastern South America: Paraná, Chaco-Paraná, and Pantanal. compile massive database estimate free-air Bouguer anomalies, resulting novel complete anomaly map for area. To discern influence crustal loads with known lithologies, including sediments, basalts, topography variations Moho discontinuity, we calculate their effects subsequently remove them from anomaly, leading to development our residual map. This highlights unknown anomalous masses within lithosphere. aid interpretation these perform 2D forward modeling. Based on results, propose new boundaries Paranapanema block Luiz Alves craton. Additionally, that Ponta Grossa swarm dike has more substantial impact crust than previously considered, delimit region this magmatism Moreover, tectonic features such as São Francisco paleocontinent Rio de La Plata craton appear be associated negative regions. Furthermore, identify emphasize significance Western Paraná Suture, which acts demarcation between Basin Pantanal Chaco-Paraná basins. Remarkably, suture appears play important role shaping density structure southwest America age history