气候变化领域集成服务门户(CCPortal): Accretion tectonics in Western Gondwana highlighted by the aeromagnetic signature of the Sergipano Belt, NE Brazil

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DOI	10.1016/j.tecto.2021.228742
	Accretion tectonics in Western Gondwana highlighted by the aeromagnetic signature of the Sergipano Belt, NE Brazil
	Almeida G.M.; Fuck R.A.; de Lima D.P.D.; Dantas E.L.
发表日期	2021
ISSN	00401951
卷号	802
英文摘要	Identification of suture zones in Precambrian orogens can be a major problem due to later reworking and/or erosion. Interpretation of aerogeophysical data is a useful tool to the understanding of the structure and evolution of old fold belts. In this study, we use aeromagnetic data to identify domain boundaries in the Sergipano Belt (SB), a Neoproterozoic orogen developed on the northern border of the São Francisco Craton (SFC), NE Brazil. The SB was formed due to convergence between the SFC and the Pernambuco-Alagoas Superterrane during the Brasiliano Orogeny, culminating in the assembly of West Gondwana. Total Magnetic Intensity (TMI) and tilt derivative maps provided the delimitation of magnetic domains corresponding to main lithological units of the Sergipano Belt and its basement and the definition of first to fourth order lineaments. Matched filter and Euler deconvolution results allowed to observe the magnetic behavior of both domains and lineaments in depth. The data suggest that the Marancó and Poço Redondo domains are two distinct lithotectonic units and that the Jirau do Ponciano dome, extreme NE of the Sergipano Belt, is likely a structural window of the São Francisco paleoplate reworked basement. Interpretation of these results combined with existent geological data allowed to highlight at least two possible terrane boundaries in the northern margin of the São Francisco Craton, represented by the São Miguel do Aleixo and Belo Monte-Jeremoabo shear zones, and the definition of the High-Intensity Magnetic Zone, which comprises a ca. 10 km wide and 140 km long corridor of mafic and ultramafic rocks, and represents the main suture zone within the SB. The data imply that the Sergipano Belt evolved as an accretionary orogen during West Gondwana assembly. © 2021 Elsevier B.V.
关键词	Borborema Province Brasiliano Orogeny Geodynamic evolution Gondwana reconstruction Sergipano Belt Suture zone
英文关键词	Buildings; Lithology; Magnesite; Magnetic domains; Aeromagnetic data; Domain boundary; Euler deconvolution; Geological data; High intensity; Magnetic behavior; Magnetic intensities; Ultramafic rocks; Matched filters; accretion; aeromagnetic survey; geodynamics; Gondwana; orogeny; Proterozoic; reconstruction; suture zone; tectonic evolution; Borborema; Brazil; Sao Francisco Craton
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207934
作者单位	Instituto de Geociências, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasília, DF 70910-900, Brazil
推荐引用方式 GB/T 7714	Almeida G.M.,Fuck R.A.,de Lima D.P.D.,et al. Accretion tectonics in Western Gondwana highlighted by the aeromagnetic signature of the Sergipano Belt, NE Brazil[J],2021,802.
APA	Almeida G.M.,Fuck R.A.,de Lima D.P.D.,&Dantas E.L..(2021).Accretion tectonics in Western Gondwana highlighted by the aeromagnetic signature of the Sergipano Belt, NE Brazil.Tectonophysics,802.
MLA	Almeida G.M.,et al."Accretion tectonics in Western Gondwana highlighted by the aeromagnetic signature of the Sergipano Belt, NE Brazil".Tectonophysics 802(2021).