气候变化领域集成服务门户(CCPortal): Lithosphere of South American intracratonic basins: Electromagnetic and potential field data reveal cratons, terranes, and sutures

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DOI	10.1016/j.tecto.2021.228884
	Lithosphere of South American intracratonic basins: Electromagnetic and potential field data reveal cratons, terranes, and sutures
	Dragone G.N.; Bologna M.S.; Ussami N.; Giménez M.E.; Alvarez O.; Lince Klinger F.G.; Correa-Otto S.
发表日期	2021
ISSN	00401951
卷号	811
英文摘要	A magnetotelluric survey comprising 18 broadband stations disposed along a 450 km-long profile was carried out at the transition between the Chaco-Paraná (CPB) and the Paraná (PB) intracratonic basins in northeastern Argentina. Three-dimensional inversions of the responses show that the CPB and southern PB lithospheres are resistive (~103 Ω m) down to 120 km, but with distinct crustal and upper mantle electrical properties. Also, Bouguer gravity and density anomalies are positive at CPB, whereas they are negative at PB. We associate the CPB lithosphere with the Paleoproterozoic Rio Tebicuary craton and the southern PB lithosphere with an ancient and buried piece of craton, the Southern Paraná craton. Geochemical data of mantle xenoliths from the Cenozoic alkaline/carbonatitic province within the Rio Tebicuary craton suggest a subcontinental lithospheric mantle affected by metasomatic processes, which explains its lower resistivity (reaching values as low as 300 Ω m) and higher density (#Mg = 0.87). In contrast, the Southern Paraná craton is more resistive (>103 Ω m) and less dense, suggesting a de-hydrated, depleted, and thicker craton. These cratons are separated by a crustal conductor (15 to 20 km depth; 1–10 Ω m) that we interpret as a southward continuation of a linear anomaly (Paraná Axial Anomaly) defined in former induction studies within the PB in Brazil. Hence, we redefined the trace of this conductive lineament: instead of bending towards the Torres Syncline, it continues inside the CPB. We propose the lineament to be an Early Neoproterozoic suture zone that controlled the location of maximum subsidence in the intracratonic basins during the Paleozoic. In the Early Cretaceous, the Paraná Axial Anomaly was the site of maximum extrusion and deposition of Serra Geral basalts. This anomaly separates compositionally distinct cratonic lithospheres along its path. Melting of this heterogeneous and enriched mantle created the Paraná igneous province. © 2021 Elsevier B.V.
关键词	Cratons Density Magnetotellurics Paraná Rio Tebicuary Sutures
英文关键词	Geophysics; Physics; Broadband station; Crustal conductors; Density anomalies; Magnetotelluric surveys; Mantle xenoliths; Metasomatic process; Potential field datum; Sub-continental lithospheric mantles; Structural geology; electrical resistivity; electromagnetic field; igneous province; intracratonic basin; magnetotelluric method; potential field; subsidence; suture zone; upper mantle; Brazil; Parana [Brazil]
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/207965
作者单位	Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Departamento de Geofísica, São Paulo, Brazil; Instituto Geofísico Sismológico Volponi (IGSV), Universidad Nacional de San Juan, Facultad de Ciencias Exactas, Físicas y Naturales, San Juan, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
推荐引用方式 GB/T 7714	Dragone G.N.,Bologna M.S.,Ussami N.,et al. Lithosphere of South American intracratonic basins: Electromagnetic and potential field data reveal cratons, terranes, and sutures[J],2021,811.
APA	Dragone G.N..,Bologna M.S..,Ussami N..,Giménez M.E..,Alvarez O..,...&Correa-Otto S..(2021).Lithosphere of South American intracratonic basins: Electromagnetic and potential field data reveal cratons, terranes, and sutures.Tectonophysics,811.
MLA	Dragone G.N.,et al."Lithosphere of South American intracratonic basins: Electromagnetic and potential field data reveal cratons, terranes, and sutures".Tectonophysics 811(2021).