Using the receiver function for studying earth deep structure in the Southern Borborema Province

Fianco, Chris Busnello; França, George Sand; Albuquerque, Diogo Farrapo; Vilar, Carlos da Silva; Argollo, Roberto Max de

doi:10.1016/j.jsames.2019.102221

Cited by 10 publications

(12 citation statements)

References 20 publications

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“…Mid-crustal discontinuities have, however, often been observed in different types of seismic data worldwide (e.g., Fianco et al, 2019;Hobbs et al, 2004;Melekhova et al, 2019;Oncken, 1998;Ross et al, 2004;Snelson et al, 2013). Important changes in the rheology of the crust have also been reported at those depths (Maggini and Caputo, 2020;Wever, 1989), supporting the idea that a mechanical boundary must exist.…”

Section: The Iberian Massif Conrad Discontinuitymentioning

confidence: 97%

“…The section was first presented by Pulgar et al (1996). Some authors have subsequently used this image to constraint the Alpine structure in the North Iberian Margin (e.g., Fernández-Viejo et al, 2000;Gallastegui et al, 2016). However, only Teixell et al (2018) used a migrated version (4000 m/s) of this section.…”

Section: Cantabrian Zone and Duero Basin (Escin-2 Section)mentioning

confidence: 99%

“…Even though the detailed interpretation of the upper-crustal reflectivity and its correlation with the surface geology does not significantly change, we revisit the deep reflectivity and redefine the extension and implications of a mid-crustal discontinuity that, in our view, exists below the entire Iberian Massif, affecting the two continents involved in the Variscan Orogeny and certainly playing a critical role in the decoupling between upper and lower crustal deformation. Finally, we infer the geometry and nature of this feature, discuss its tectonic significance and its role during the younger Alpine Orogeny, and relate it to the long-debated (e.g., Finlayson et al, 1984;Litak and Brown, 1989;Wever, 1989;Xiaobo and Tae Kyung, 2010) Conrad discontinuity (Conrad, 1925) of classic continental seismology.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of the Iberian Massif as deduced from its crustal thickness and geometry of a mid-crustal (Conrad) discontinuity

Ayarza

Catalán²,

García

et al. 2021

Solid Earth

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Abstract. Normal incidence seismic data provide the best images of the crust and lithosphere. When properly designed and continuous, these sections greatly contribute to understanding the geometry of orogens and, along with surface geology, unraveling their evolution. In this paper we present the most complete transect, to date, of the Iberian Massif, the westernmost exposure of the European Variscides. Despite the heterogeneity of the dataset, acquired during the last 30 years, the images resulting from reprocessing the data with a homogeneous workflow allow us to clearly define the crustal thickness and its internal architecture. The Iberian Massif crust, formed by the amalgamation of continental pieces belonging to Gondwana and Laurussia (Avalonian margin), is well structured in the upper and lower crust. A conspicuous mid-crustal discontinuity is clearly defined by the top of the reflective lower crust and by the asymptotic geometry of reflections that merge into it, suggesting that it has often acted as a detachment. The geometry and position of this discontinuity can give us insights into the evolution of the orogen (i.e., of the magnitude of compression and the effects and extent of later-Variscan gravitational collapse). Moreover, the limited thickness of the lower crust below, in central and northwestern Iberia, might have constrained the response of the Iberian microplate to Alpine shortening. Here, this discontinuity, featuring a Vp (P-wave velocity) increase, is observed as an orogen-scale boundary with characteristics compatible with those of the globally debated Conrad discontinuity.

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Section: The Iberian Massif Conrad Discontinuitymentioning

confidence: 97%

Section: Cantabrian Zone and Duero Basin (Escin-2 Section)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution of the Iberian Massif as deduced from its crustal thickness and geometry of a mid-crustal (Conrad) discontinuity

Ayarza

Catalán²,

García

et al. 2021

Solid Earth

View full text Add to dashboard Cite

show abstract

“…Mid-crustal discontinuities have, however, been observed very often and in different types of seismic data worldwide (e.g., Fianco et al, 2019;Hobbs et al, 2004;Melekhova et al, 2019;Oncken, 1998;Ross et al, 2004;Snelson et al, 2013). Important changes in the rheology of the crust have also been reported at those depths (Maggini and Caputo, 2020;Wever, 1989) supporting the idea that a mechanical boundary must exist.…”

Section: Significance Of a Mid-crustal Discontinuity: The Conrad Discmentioning

confidence: 99%

Evolution of the Iberian Massif as deduced from its crustal thickness and geometry of a mid-crustal (Conrad) discontinuity

Ayarza¹,

Catalán²,

García³

et al. 2020

Preprint

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Abstract. Normal incidence seismic data provide the best images of the crust and lithosphere. When properly designed and continuous, these sections greatly contribute to understanding the geometry of orogens and, together with surface geology, to unravel their evolution. In this paper we present an almost complete transect of the Iberian Massif, the westernmost exposure of the European Variscides. Despite the heterogeneity of the dataset, acquired during the last 30 years, the images resulting from reprocessing with a homogeneous workflow allow us to clearly define the crustal thickness and its internal architecture. The Iberian Massif crust, formed by the amalgamation of continental pieces belonging to Gondwana and Laurussia (Avalonian margin) is well structured in upper and lower crust. A conspicuous mid-crustal discontinuity is clearly defined by the top of the reflective lower crust and by the asymptotic geometry of reflections that merge into it, suggesting that it has often acted as a detachment. The geometry and position of this discontinuity can give us insights on the evolution of the orogen, i.e. of the effects and extent of the late Variscan gravitational collapse. Also, its position and the limited thickness of the lower crust in central and NW Iberia constraints the response of the Iberian microplate to Alpine shortening. This discontinuity is here observed as an orogeny-scale feature with characteristics compatible with those of the worldwide, Conrad discontinuity.

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“…In the last few years, several geological and geophysical studies have been developed in this area in order to unveil the crustal structure as Argollo et al (2011) who studied the crustal model and heat flow in the Estância, Vaza-Barris and Macururé domains, based on the measurement of density, conductivity and estimation of the volumetric rate of heat production; Dutra et al (2018), who developed a crust structure model and geothermal flow map for the adjacent region to the Sergipe-Alagoas basin; Araújo (2019) who studied the size of sources in the transition zone between of the Segipano belt and the Pernambuco-Alagoas domain; Dutra et al (2017) which estimated the basement thickness and lateral variation of the density contrast in the Estância, Canudos-Vaza-Barris, Macururé domains and Pernambuco-Alagoas Terrain; Fianco et. (2019) and Dutra et al (2019) which estimated the moho thickness for Pernambuco-Alagoas terrain and also for the Sergipano belt; and Oliveira (2009) which proposes a less thick lithosphere in the Salvador-Esplanada-Boquím domain and https://doi.org/10.5194/se-2021-81 Preprint.…”

Section: Introductionmentioning

confidence: 99%

Joint modeling gravity, geoidal and geothermal of the Lithosphere in Sergipano Belt and tectonic implications, NE Brazil

Flores

Dutra

Costa

et al. 2021

Preprint

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Abstract. In this research paper were applied methods which integrate geophysical and petrological data to the crustal and lithospheric structure in the Sergipano Belt, in the Southern Borborema Province, NE Brazil. These methods allowed us to unveil the main crustal features and their tectonic relationships with the crust-mantle interface (Moho), as well as the lithosphere-asthenosphere boundary (LAB) of this region. The crust structure was constrained by available geological, gravimetric and seismological data, and chemical composition for mantle bodies. Gravity, geoid and heat flow data integrated with existent geological and geophysical data provides to understand the evolution of the Southern Borborema Province. The modeling method was based on local isostasy in which the first phase of the work consisted on the filtering of geoid anomaly and topography data using low-pass in the harmonic and frequency domains, respectively, to estimate the thickness of the crust and the lithosphere, and the second phase is characterized by geothermal modeling. The crustal structure was constrained by geological information, thermo-physical parameters, and gravity and magnetic data inversion results, while the lithospheric mantle was constrained by chemical composition of xenoliths. The results show that maximum depths of Moho and thermal lithosphere (LAB) along the modeled profile are 34–42 km and 194–202 km observed, and temperatures are recorded with an average of 600 °C in the Moho temperature at Sergipano belt. The results presented suggest a thinning lithospheric mantle below the Sergipano belt, with values varying between 168 to 180 km, excepting in Girau do Ponciano whose is 194 km and a moderate lithospheric thickening below the Rio Coruripe, and thicker lithosphere at Pernambuco-Alagoas terrains reached 202 km.

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Using the receiver function for studying earth deep structure in the Southern Borborema Province

Cited by 10 publications

References 20 publications

Evolution of the Iberian Massif as deduced from its crustal thickness and geometry of a mid-crustal (Conrad) discontinuity

Evolution of the Iberian Massif as deduced from its crustal thickness and geometry of a mid-crustal (Conrad) discontinuity

Evolution of the Iberian Massif as deduced from its crustal thickness and geometry of a mid-crustal (Conrad) discontinuity

Joint modeling gravity, geoidal and geothermal of the Lithosphere in Sergipano Belt and tectonic implications, NE Brazil

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