Crustal framework of the northwest Paraná Basin, Brazil: Insights from joint modeling of magnetic and gravity data

Optimizing depth estimates from magnetic anomalies using spatial analysis tools

“…Semi-circular contacts may represent magnetic intrusive bodies. Our depth solutions indicate a magnetic basement around 2-3 km deep in this locale (Figure 9a), below the metasedimentary basement recorded in the 2AG1MT well (1.9 km), suggesting that the basement is not a significant magnetic contrast with overlying sedimentary rocks, as indicated by previous studies(Curto et al, 2014(Curto et al, , 2015. In the southeast region of the study area, the 2JA1GO well bottomed at a depth of 2.1 km without reaching basement.…”

“…The sedimentary rocks of the basin continued to form until Late Jurassic and were subsequently covered by a later magmatic event in the Early Cretaceous (Serra Geral Formation; Milani and Thomaz Filho, 2000). Our goal at present is to estimate depths of tectonic and geologic elements investigated in previous studies (Zalán et al, 1991;Milani and Ramos, 1998;Curto et al, 2014Curto et al, , 2015. These elements include vertical contacts of intrusive bodies and intrasedimentary volcanic rocks, and structural lineaments within the basement (Figure 8a).…”

The contribution of an urban gravity survey to the determinable perspective of Athens city (Greece) underground structure

“…The only difference is that the calculated depth solutions for the gravity method are located at a deeper level, closer to the center of the mass, in regard with the ones of magnetics. The outcome of the Euler deconvolution here is a map, illustrating the locations and depths of the geologic sources of gravity anomalies that have been identified in grid-based gravity data, like in several other cases [18,24,31,40,59,62,63]. For the best results from Euler deconvolution, Reid et al [72,73] discuss the avoidable errors during its application to gravity data and how to determine suitably the required parameters (SI, window size, grid interval etc.).…”

“…One of the methods used in this paper is the Euler deconvolution, successfully applied in the past by other authors [18,24,31,40,59,62,63]. Practically, Euler methods are considered as derivatives method of first, second or even third order.…”

Geoquímica e petrografia das formações ferríferas e rochas clásticas do Grupo Jacadigo, Neoproterozoico do Sul da Faixa Paraguaia

“…The Paraná block participated in the second half of the construction of the Tocantins Province and also played a critical role in the evolution of the Paraguay belt. The geophysical boundary between this block and the Amazon craton is situated under the Paraná basin and is likely (Curto et al, 2015) a segment of the NE-SW Transbrasiliano-Kandi shear zone (Cordani et al, 2013) which, in South America (Fig. 1a), stretches all across Brazil, Paraguay, and part of Argentina.…”