Lithosphere of South American intracratonic basins: Electromagnetic and potential field data reveal cratons, terranes, and sutures

Dragone, Gabriel Negrucci; Bologna, Maurício S.; Ussami, Naomi; Giménez, Mario; Álvarez, Orlando; Klinger, Federico Lince; Correa-Otto, Sebastián

doi:10.1016/j.tecto.2021.228884

Cited by 7 publications

(6 citation statements)

References 65 publications

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“…Even after removing the known mass effects, noticeable differences persist between the west and east sides of the Western Paraná Suture, corroborating Dragone et al's (2017;2021) hypothesis of a suture zone between two distinct lithospheres: a thinner lithosphere in the west compared to the eastern portion. This feature allows us to partition the study area into two distinct regions.…”

Section: Tectonic Features On the Gravity Anomaly Mapssupporting

confidence: 69%

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

Moura,

Marangoni

2023

Front. Earth Sci.

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

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Section: Tectonic Features On the Gravity Anomaly Mapssupporting

confidence: 69%

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

Moura,

Marangoni

2023

Front. Earth Sci.

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“…The western and southern parts of the Paraná Basin (6PrB(n), 6PrB(w), and 6PrB(s)) are underlain by a relatively thin (∼100 km) present‐day lithosphere. As mentioned before, these regions coincide with a geophysically identified suture zone (Bologna et al., 2019; Dragone et al., 2017, 2021), the Western Paraná Suture/Shear Zone (WPSZ). This suture zone follows a gravity gradient between negative Bouguer anomalies in the east, and positive Bouguer anomalies in the west, and it also coincides with changes in crustal thickness, lithospheric velocities, and electrical resistivity (Dragone et al., 2017).…”

Section: Discussionsupporting

confidence: 58%

“…Others proposed cratonic blocks include the Rio Tebicuary (Dragone et al., 2017; Favetto et al., 2015) and the Rio de la Plata Craton which is partly overlain by the Chaco Basin (Bologna et al., 2019; Dragone et al., 2017; Oyhantçabal et al., 2010; Rapela et al., 2007, 2011). These cratonic blocks would also have been part of the West Gondwana amalgamation during the Neoproterozoic (Dragone et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

“…The blue dashed line is the Western Paraná Suture Zone (adapted from Dragone et al. (2021)). Paleozoic sedimentary basins are adapted from IBGE (2010).…”

Section: Introductionmentioning

confidence: 99%

“…During this process, the orogenic belts of the Brasiliano Orogenic System (900–460 Ma) were formed around the cratonic cores, resulting in the Borborema (between São Francisco and Parnaiba), Tocantins (between São Francisco and Paranapanema) and Mantiqueira (between Rio de la Plata and Paranapanema) Structural Provinces. Other expressions of the assembly of western Gondwana include the Transbrasiliano Lineament (TBL; Almeida et al., 2000; Cordani et al., 2000), a continental NE‐SW shear zone with a clear surface expression, and the Western Paraná Suture Zone (WPSZ), a geophysically identified east‐ward dipping suture zone between the Paranapanema Block and cratonic blocks to the west and south (Dragone et al., 2017, 2021). The end of the Brasiliano Cycle was characterized by exhumation, extrusive volcanism and gravitational collapse of the orogens under an extensional tectonic regime (630‐440 Ma, Fuck et al., 2008; Heilbron & Machado, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Thermo‐Compositional Structure of the South American Platform Lithosphere: Evidence of Stability, Modification, and Erosion

Altoe

Goes

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2022

Geochem Geophys Geosyst

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Introduction MotivationCratons are the stable continental cores formed during the Precambrian. Their formation, evolution and long-term stability is still debated (e.g., C.-T. A. Lee et al., 2011;van Hunen & Moyen, 2012;Sleep, 2005). Mapping lithospheric temperatures and compositional heterogeneity may shed light on their formation, evolution, and long-term stability. Cratonic mantle lithosphere is often described as relatively homogeneous, characterized by thick and high-wavespeed roots (Schaeffer & Lebedev, 2015), low surface heat flow (Cooper et al., 2004), and being approximately neutrally buoyant due to iron depletion as a result of melt extraction (Griffin et al., 2009;Jordan, 1978). However, recent studies have found heterogeneities within and between cratonic keels. S-to-P receiver function studies in cratonic regions have revealed sharp negative and/or positive wavespeed-depth gradients in the lithospheric mantle. The low or high wavespeed layers needed to explain such gradients have been

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Neoproterozoic lithospheric structures at the Borborema Province: Integration of magnetotelluric resistivity sections and their relations to neighboring lithospheric blocks of the Parnaíba Basin and São Francisco Craton

Souza Filho,

Seoane

2024

Journal of South American Earth Sciences

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Lithosphere of South American intracratonic basins: Electromagnetic and potential field data reveal cratons, terranes, and sutures

Cited by 7 publications

References 65 publications

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

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

Thermo‐Compositional Structure of the South American Platform Lithosphere: Evidence of Stability, Modification, and Erosion

Neoproterozoic lithospheric structures at the Borborema Province: Integration of magnetotelluric resistivity sections and their relations to neighboring lithospheric blocks of the Parnaíba Basin and São Francisco Craton

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