Crustal architecture of the Borborema Province, NE Brazil, from receiver function CCP stacks: Implications for Mesozoic stretching and Cenozoic uplift

Almeida, Ygor Bastos Mesquita Minora de; Julià, Jordi; Frassetto, A.

doi:10.1016/j.tecto.2015.03.001

Cited by 22 publications

(34 citation statements)

References 48 publications

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“…Those P velocity values are somewhat slower than the 6.6–6.7 km/s estimates reported in Chulick et al [] for the Borborema crystalline crust. The divide between upper and lower crust coincides with an intracrustal discontinuity that was independently reported in a recent common conversion point (CCP) receiver function migration in the Borborema Province [ Almeida et al , ]. The CCP receiver function stacks revealed the intracrustal discontinuity is preferentially observed in regions of thin crust, including the northern Plateau, and less developed or absent in the regions of thick crust of the southern Plateau.…”

Section: Geology and Tectonic Settingsupporting

confidence: 78%

“…The velocity‐depth profiles also show that an intracrustal discontinuity is preferentially observed in the regions of thin crust within the Borborema Province, as noted in Almeida et al [], which separates an upper crust of 3.4–3.6 km/s from a lower crust of 3.7–3.8 km/s. These crustal S velocities are roughly consistent with average S velocities for the crystalline crust reported in Chulick et al [], and with P velocities reported in the refraction study of de Lima et al [], when an average V P / V S ratio of 1.74 ± 0.04 [ Luz et al , ] is assumed.…”

Section: Deep Velocity Structuresupporting

confidence: 60%

“…The previously described pattern of crustal thickness was confirmed by detailed receiver function studies in the Borborema Province [ Luz et al , ; Almeida et al , ], which also showed interesting variations in crustal thickness within the Province. In particular, both studies revealed that the crust of the Borborema Plateau south of the Patos Lineament (hereafter referred to as the southern Plateau) is 36–38 km thick, while the crust in the neighboring regions—including the northern Plateau, the Sertaneja depression, and the coastal cuestas—is thinner, around 30–32 km.…”

Section: Geology and Tectonic Settingmentioning

confidence: 99%

“…Receiver function estimates were developed at 44 seismic stations belonging to a number of permanent and temporary networks throughout the Province [ Luz et al , ], while dispersion velocity measurements were obtained from a regional ambient noise tomography study [ Dias et al , ], and a surface wave tomography study for the South American continent [ Feng et al , ; Luz et al , ]. The velocity‐depth profiles confirm the presence of thicker crust under the southern Plateau and thinner crust under the northern Plateau and the surrounding lowlands, as already reported in previous studies [e.g., Luz et al , ; Oliveira and Medeiros , ; Almeida et al , ]. The profiles also show that the thicker crust displays a thin gradational layer of fast‐velocity material overlying the Moho, which is interpreted as a layer of mafic underplate.…”

Section: Introductionmentioning

confidence: 99%

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Crustal structure of the eastern Borborema Province, NE Brazil, from the joint inversion of receiver functions and surface wave dispersion: Implications for plateau uplift

2015

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We investigate the crustal structure of the Borborema Province of NE Brazil by developing 44 S wave velocity‐depth profiles from the joint inversion of receiver functions and fundamental mode, Rayleigh wave group velocities. The Borborema Province is located in the northeasternmost corner of the South American continent and represents a portion of a larger Neoproterozoic mobile belt that formed during the Brasiliano‐Pan African orogeny. Extensional processes in the Mesozoic—eventually leading to the separation of Africa and South America—left a number of aborted rift basins in the continental interiors, and episodes of diffuse intraplate volcanism and uplift marked the evolution of the Province after continental breakup. Our velocity‐depth profiles reveal the existence of two crustal types in the Province: (i) the thin crustal type, which consists of 30–32.5 km thick crust, with an upper layer of 3.4–3.6 km/s overlying a lower layer of 3.7–3.8 km/s and (ii) the thick crustal type, which consists of a 35–37.5 km thick crust, with velocities between 3.5 and 3.9 km/s down to ∼30 km depth and a gradational increase in velocity (VS≥4.0 km/s) down to upper mantle depths. The crustal types correlate well with topography, with the thick crustal type being mainly found in the high‐standing southern Borborema Plateau and the thin crustal type being mostly found in the low‐lying Sertaneja depression and coastal cuestas. Interestingly, the thin crustal type is also observed under the elevated topography of the northern Plateau. We argue that the thick crustal type is rheologically strong and not necessarily related to postbreakup mantle processes, as it is commonly believed. We propose that extensional processes in the Mesozoic stretched portions of the Brasiliano crust and formed the thin crustal type that is now observed in the regions of low‐lying topography, leaving the rheologically strong thick crust of the southern Plateau at higher elevations. The crust making the northern Plateau would have thinned and subsided during Mesozoic extension as part of a greater Sertaneja depression, to then experience uplift in the Cenozoic and achieve its present elevation.

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Section: Geology and Tectonic Settingsupporting

confidence: 78%

Section: Deep Velocity Structuresupporting

confidence: 60%

Section: Geology and Tectonic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crustal structure of the eastern Borborema Province, NE Brazil, from the joint inversion of receiver functions and surface wave dispersion: Implications for plateau uplift

2015

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“…The delaminated crust would then have been stretched and thinned during the Mesozoic to form the low-lying regions that surround the southern plateau. During the extension process, an intracrustal detachment zone, perhaps linking the extensive network of shear zones at depth, would have formed in the regions of thin crust (Almeida et al, 2015). Part of the thinned crust would have experienced uplift during the Cenozoic and formed the northern Plateau.…”

Section: Geology and Tectonic Frameworkmentioning

confidence: 99%

Upper mantle anisotropy of the Borborema Province, NE Brazil: Implications for intra-plate deformation and sub-cratonic asthenospheric flow

et al. 2015

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Spatial and temporal uplift history of South America from calibrated drainage analysis

Tribaldos

White

Hoggard

2017

Geochem Geophys Geosyst

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A multidisciplinary approach is used to analyze the Cenozoic uplift history of South America. Residual depth anomalies of oceanic crust abutting this continent help to determine the pattern of present‐day dynamic topography. Admittance analysis and crustal thickness measurements indicate that the elastic thickness of the Borborema and Altiplano regions is ≤10 km with evidence for sub‐plate support at longer wavelengths. A drainage inventory of 1827 river profiles is assembled and used to investigate landscape development. Linear inverse modeling enables river profiles to be fitted as a function of the spatial and temporal history of regional uplift. Erosional parameters are calibrated using observations from the Borborema Plateau and tested against continent‐wide stratigraphic and thermochronologic constraints. Our results predict that two phases of regional uplift of the Altiplano plateau occurred in Neogene times. Regional uplift of the southern Patagonian Andes also appears to have occurred in Early Miocene times. The consistency between observed and predicted histories for the Borborema, Altiplano, and Patagonian plateaux implies that drainage networks record coherent signals that are amenable to simple modeling strategies. Finally, the predicted pattern of incision across the Amazon catchment constrains solid sedimentary flux at the Foz do Amazonas. Observed and calculated flux estimates match, suggesting that erosion and deposition were triggered by regional Andean uplift during Miocene times.

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Crustal architecture of the Borborema Province, NE Brazil, from receiver function CCP stacks: Implications for Mesozoic stretching and Cenozoic uplift

Cited by 22 publications

References 48 publications

Crustal structure of the eastern Borborema Province, NE Brazil, from the joint inversion of receiver functions and surface wave dispersion: Implications for plateau uplift

Crustal structure of the eastern Borborema Province, NE Brazil, from the joint inversion of receiver functions and surface wave dispersion: Implications for plateau uplift

Upper mantle anisotropy of the Borborema Province, NE Brazil: Implications for intra-plate deformation and sub-cratonic asthenospheric flow

Spatial and temporal uplift history of South America from calibrated drainage analysis

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