Crustal structure of the Amazonian Craton and adjacent provinces in Brazil

Albuquerque, Diogo Farrapo; França, George Sand; Moreira, L. P.; Assumpção, Marcelo; Bianchi, Marcelo; Barros, Lucas Vieira; Condori, Cristobal; Oliveira, Magda Estrela

doi:10.1016/j.jsames.2017.08.019

Cited by 25 publications

(25 citation statements)

References 32 publications

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“…Crustal thickness (H) is shown in the left column and Vp / Vs ratio in the right column. (a) Albuquerque et al () for Amazonian stations. (b) Assumpção, Bianchi, et al () for Brazil.…”

Section: Methodsmentioning

confidence: 99%

“…More details can be found in Bianchi et al (). The publications used to compile recent results from the literature, since the previous compilation of 2013, are from Argentina (Ammirati et al, ; Perarnau et al, ), Brazil (Albuquerque et al, ; Assumpção et al, ; Berrocal et al, ; Coelho et al, ; Daly et al, ; Evain et al, ; Julià et al, ; Luz et al, ; Luz et al, ; Moreira, ; Soares et al, ; Trindade et al, ), Colombia (Monsalve et al, ; Poveda et al, ), Ecuador (Araujo, ; Font et al, ), Peru (Condori et al, ; James & Snoke, ; Ryan et al, ), and Patagonia (Buffoni et al, ; Rodríguez & Russo, ) and can be found in the supporting information. The database is available in the Zenodo platform (https://doi.org/10.5281/zenodo.2604359).…”

Section: Data and Resourcesmentioning

confidence: 99%

“…Besides the data analyzed in this study, other published results were included such as (a) the Moho models from active experiments in the Parnaíba Basin, northern Brazil (Daly et al, 2014;Soares et al, 2018), and the continental shelf in southern Brazil (Evain et al, 2015), (b) crustal thicknesses from RF studies in the Parnaíba Basin and Boborema Province (Coelho et al, 2018;Julià et al, 2018;Trindade et al, 2014), and (c) new RF results from the Andes in Bolivia, Peru, and Colombia (Condori et al, 2017;Poveda et al, 2015;Ryan et al, 2016). Stations with good results from Albuquerque et al (2017) in the Amazon region were also included.…”

Section: Updated Crustal Thickness Map Of South Americamentioning

confidence: 99%

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An Updated Crustal Thickness Map of Central South America Based on Receiver Function Measurements in the Region of the Chaco, Pantanal, and Paraná Basins, Southwestern Brazil

et al. 2019

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Previous compilation of crustal structure in South America had large unsampled areas including the thin crust in the Sub‐Andean lowlands, largely estimated by gravity data, and the sparsely sampled Amazon Craton. A deployment of 35 seismic stations in Brazil, Bolivia, Paraguay, Argentina, and Uruguay improved the coverage of the Pantanal Basin in Western Brazil, the intracratonic Paraná and the Chaco Basins. Crustal thicknesses and Vp/Vs ratios were estimated with a modified H‐k method by producing three stacked traces to enhance the three Moho conversions (the direct Ps and the two multiples Ppps and Ppss). This modified method gives lower uncertainties than previous studies and shows more regional consistency between nearby stations. The temporary stations and the Brazilian Network (RSBR) have characterized the crustal structure as follows. The Paraná Basin has a thick crust 40–45 km and average Vp/Vs ratio (1.71–1.77), while the Chaco Basin has a slightly thinner crust (35–40 km) and higher Vp/Vs ratio (1.75–1.79). This confirms the lack of widespread magmatic underplating in the Paraná Basin that could be related to the origin of the flood basalts during the South Atlantic opening. A belt of thin crust (30–35 km) with low Vp/Vs (<1.74) is confined to the eastern edge of the Pantanal Basin. Normal crust (38–43 km) is observed along the western edge of the Pantanal, from the southern part of the Amazon craton to the Rio Apa cratonic block. This study, combined with other published data, provides an updated crustal thickness map of South America.

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“…Crustal thickness (H) is shown in the left column and Vp / Vs ratio in the right column. (a) Albuquerque et al () for Amazonian stations. (b) Assumpção, Bianchi, et al () for Brazil.…”

Section: Methodsmentioning

confidence: 99%

Section: Data and Resourcesmentioning

confidence: 99%

Section: Updated Crustal Thickness Map Of South Americamentioning

confidence: 99%

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An Updated Crustal Thickness Map of Central South America Based on Receiver Function Measurements in the Region of the Chaco, Pantanal, and Paraná Basins, Southwestern Brazil

et al. 2019

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“…The Rio Maria domain presents bulk V s higher than 4.6 km/s, whereas Carajás and Bacajá domains show velocities lower than that. Accordingly, a common V p /V s ratio (~1.7) 48 is observed in the crust from Carajás to Bacajá (Supplementary Information Appendix Fig. S3), suggesting a similar bulk felsic crust for them.…”

Section: Resultsmentioning

confidence: 86%

“…To constrain our predicted model for the crustal structure independently, we analyze the V p and V s velocity structure 47,48 , and the Lithosphere-Asthenosphere Boundary (LAB) 49 depth in the region. The V s -velocity from seismic tomography studies 47 shows a velocity boundary within the mantle at 100 km depth (Fig.…”

Section: Resultsmentioning

confidence: 99%

Archean crust and metallogenic zones in the Amazonian Craton sensed by satellite gravity data

Motta

Filho

Carranza

et al. 2019

Sci Rep

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The formation of ore deposits has been extensively studied from a shallow crust perspective. In contrast, the association of mineral systems with deep crustal structure of their host terranes remains relatively undisclosed, and there is evidence that processes throughout the lithosphere are coupled for their evolution. The current debate centers on the control of the regional deep crustal architecture in focusing and transferring fluids between geochemical reservoirs. Defining such architecture is not unequivocal, and involves combining indirect information in order to constrain its physical properties and evolution. Herein, based on evidence from satellite gravity, constrained by airborne potential field data (gravity and magnetics), we provide an example on how the lithosphere geometry controlled the location of copper and gold systems in the world-class Archean Carajás Mineral Province (Amazonian Craton, South America). Validation with information from passive seismic (wave speeds, crustal and lithospheric thickness) and geochronologic data (model, crystallization ages, and Neodymium isotope ratio determinations) portrays a significantly enlarged, poly-phase, Archean crust that exerted geometric control on the location of the mineral systems within and adjacent to the province during tectonic quiescence and switches. This new geologic scenario impacts the understanding of the Amazonian Craton. Synergy between multi-source data, as experimented here, can provide robust models efficiently and, conceivably, help to unveil similar terrains elsewhere.

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Neural spline flow multi-constraint NURBS method for three-dimensional automatic geological modeling with multiple constraints

et al. 2023

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Crustal structure of the Amazonian Craton and adjacent provinces in Brazil

Cited by 25 publications

References 32 publications

An Updated Crustal Thickness Map of Central South America Based on Receiver Function Measurements in the Region of the Chaco, Pantanal, and Paraná Basins, Southwestern Brazil

An Updated Crustal Thickness Map of Central South America Based on Receiver Function Measurements in the Region of the Chaco, Pantanal, and Paraná Basins, Southwestern Brazil

Archean crust and metallogenic zones in the Amazonian Craton sensed by satellite gravity data

Neural spline flow multi-constraint NURBS method for three-dimensional automatic geological modeling with multiple constraints

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