Magnetic characterization and signature of the basement of eastern Venezuela: Espino Graben

Paleoproterozoic basement of Içana Domain, Rio Negro Province, northwestern Amazonian Craton: Geology, geochemistry and geochronology (U-Pb and Sm-Nd)

“…Recent work of Cediel (2019) combined interpretation from multiple sources to integrate a paleogeographic sketch map with relevant Meso and Neoproterozoic tectonostratigraphic units for the Guyana Shield (Figure 3-4d). This sketch marks an important structure to the NW of the area as the "Arauca Impactogen" (San Fernando Graben in González et al, 2017) and the Atabapo and Rionegro rifts to the SE. This work also presented a structural sketch map of south America (blue lines, Figure 3-4c) that, for the study area, delineate the E-W Guaviare Fault at the south and NNE-SSW normal faults that control the Mantecal Graben, and NNW-SSE faults that control the Rionegro and Atabapo Rifts.…”

“…The application of these steps at multiple upward continuation levels of the potential field data constraints the position and strength of the edges of the sources, and the results can be interpreted in terms of the 3D architecture and depth extend of geological structures (Yan et al, 2011). This technique could represent a compromise between a mostly qualitative "visual inspection" and a mostly quantitative determination of the vertical and horizontal extent of geological bodies (Hornby et al, 1999;Bird, 2001;Ferreira et al, 2011;Park et al, 2013;Soares & Da Costa, 2013;González et. al., 2017;Geng et al, 2019).…”