Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion

Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion

16 pages, 14 figures, 1 table, supplementary material https://doi.org/10.1016/j.tecto.2021.229024

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Bibliographic Details
Main Authors: Nemocon, Ana Milena, Julià, Jordi, García, Xavier
Other Authors: Petrobras
Format: artículo biblioteca
Language:English
Published: Elsevier 2021-10
Subjects:Basin inversion, Mafic lowermost crust, Araripe Basin, Receiver functions,
Online Access:http://hdl.handle.net/10261/253115
http://dx.doi.org/10.13039/501100011033
http://dx.doi.org/10.13039/501100003593
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spelling dig-icm-es-10261-2531152022-08-16T06:43:53Z Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion Nemocon, Ana Milena Julià, Jordi García, Xavier Petrobras Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil) Agencia Estatal de Investigación (España) Basin inversion Mafic lowermost crust Araripe Basin Receiver functions 16 pages, 14 figures, 1 table, supplementary material https://doi.org/10.1016/j.tecto.2021.229024 The Proterozoic Borborema province of NE Brazil was under extensional stresses during the Mesozoic, causing stretching and thinning of the lithosphere. During Cenozoic times, compression associated with the development of the South Atlantic and collision along the Andean front dominated throughout the Province. One of the main consequences of such compression might have been the formation of the Chapada de Araripe, an inverted rift basin located in the Western Province. We undertook a passive seismic experiment along a NS profile crossing the Borborema province and a short EW profile across the Chapada de Araripe, with the goal of providing constraints on the origin of the Chapada de Araripe. A variety of mechanisms can contribute to basin uplift, so understinding basin inversion is in turn important for understanding the tectonic evolution and geodynamics of NE Brazil. Through joint inversion of receiver functions and surface-wave dispersion, we show that the crust is typically 34–38 km thick under the western Province; in contrast, the crust is 43–46 km thick under the northern craton. No apparent crustal thinning is observed under the Araripe Basin, due to the presence of a relatively thick (10–14 km) high-velocity (4.1–4.3 km/s) lowermost crust. Our velocity models also image a drop in S-velocity (from 4.6 km/s to 4.3 km/s) at 135–145 km depth under the southern half of the profile, which we interpret as a mid-lithospheric discontinuity, and at 120–140 km depth under the Araripe Basin, likely representing the lithosphere-asthenosphere boundary. Our findings confirm the presence of thin lithosphere under the Araripe Basin - originally postulated by a collocated MT survey - that might have facilitated tectonic inversion of this basin through regional stress concentration and thermal buoyancy. These findings also suggest additional buoyancy contributed by a mafic lowermost crust right under the basin Financial support was provided to AMN by PETROBRAS (grant PRH-PB 229, project PIB10314-2013) to complete her PhD at the Universidade Federal do Rio Grande do Norte. The acquisition of the dataset was possible through a grant from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (CNPq-400743/2014-0) and the national oil company Petróleo Brasileiro S.A. (Petrobras). JJ additionally thanks CNPq for his research fellowship (CNPq-304421/2015-04) With the institutional support of the ‘Severo OchoaCentre of Excellence’ accreditation (CEX2019-000928-S) Peer reviewed 2021-10-27T10:08:17Z 2021-10-27T10:08:17Z 2021-10 artículo http://purl.org/coar/resource_type/c_6501 Tectonophysics 816: 229024 (2021) 0040-1951 CEX2019-000928-S http://hdl.handle.net/10261/253115 10.1016/j.tecto.2021.229024 http://dx.doi.org/10.13039/501100011033 http://dx.doi.org/10.13039/501100003593 en Postprint https://doi.org/10.1016/j.tecto.2021.229024 Sí embargo_20231031 Elsevier
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Basin inversion
Mafic lowermost crust
Araripe Basin
Receiver functions
Basin inversion
Mafic lowermost crust
Araripe Basin
Receiver functions
spellingShingle Basin inversion
Mafic lowermost crust
Araripe Basin
Receiver functions
Basin inversion
Mafic lowermost crust
Araripe Basin
Receiver functions
Nemocon, Ana Milena
Julià, Jordi
García, Xavier
Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion
description 16 pages, 14 figures, 1 table, supplementary material https://doi.org/10.1016/j.tecto.2021.229024
author2 Petrobras
author_facet Petrobras
Nemocon, Ana Milena
Julià, Jordi
García, Xavier
format artículo
topic_facet Basin inversion
Mafic lowermost crust
Araripe Basin
Receiver functions
author Nemocon, Ana Milena
Julià, Jordi
García, Xavier
author_sort Nemocon, Ana Milena
title Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion
title_short Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion
title_full Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion
title_fullStr Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion
title_full_unstemmed Lithospheric structure of the western Borborema Province from receiver functions and surface-wave dispersion: Implications for basin inversion
title_sort lithospheric structure of the western borborema province from receiver functions and surface-wave dispersion: implications for basin inversion
publisher Elsevier
publishDate 2021-10
url http://hdl.handle.net/10261/253115
http://dx.doi.org/10.13039/501100011033
http://dx.doi.org/10.13039/501100003593
work_keys_str_mv AT nemoconanamilena lithosphericstructureofthewesternborboremaprovincefromreceiverfunctionsandsurfacewavedispersionimplicationsforbasininversion
AT juliajordi lithosphericstructureofthewesternborboremaprovincefromreceiverfunctionsandsurfacewavedispersionimplicationsforbasininversion
AT garciaxavier lithosphericstructureofthewesternborboremaprovincefromreceiverfunctionsandsurfacewavedispersionimplicationsforbasininversion
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