Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform
The crust of the South American platform recorded imprints of dynamic processes related with the opening of the Central and South Atlantic but has not been well measured. Crustal structure can be retrieved from teleseismic receiver functions using H–κ stacking, but nearly parallel stripes of high st...
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| Language: | English |
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2024
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| Online Access: | https://hdl.handle.net/20.500.12008/51079 |
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| _version_ | 1868890194096160768 |
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| author | Meijian, An |
| author2 | Feng, Mei Assumpçao, Marcelo S Bianchi, Marcelo B França, George S Rocha, Marcelo P Sánchez Bettucci, Leda |
| author2_role | author author author author author author |
| author_browse | Assumpçao, Marcelo S Bianchi, Marcelo B Feng, Mei França, George S Meijian, An Rocha, Marcelo P Sánchez Bettucci, Leda |
| author_facet | Meijian, An Feng, Mei Assumpçao, Marcelo S Bianchi, Marcelo B França, George S Rocha, Marcelo P Sánchez Bettucci, Leda |
| author_role | author |
| collection | COLIBRI |
| dc.contributor.none.fl_str_mv | Meijian An Feng Mei Assumpçao Marcelo S Bianchi Marcelo B França George S Rocha Marcelo P Sánchez Bettucci Leda, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ciencias Geológicas. |
| dc.coverage.none.fl_str_mv | South America |
| dc.creator.none.fl_str_mv | Meijian, An Feng, Mei Assumpçao, Marcelo S Bianchi, Marcelo B França, George S Rocha, Marcelo P Sánchez Bettucci, Leda |
| dc.date.none.fl_str_mv | 2024 2025-08-18T15:56:00Z 2025-08-18T15:56:00Z |
| dc.format.none.fl_str_mv | 18 h application/pdf |
| dc.identifier.none.fl_str_mv | Meijian, A, Feng, M, Assumpçao, M [y otros autores]. "Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform". Geophysical Journal International. [en línea] 2024, 239(1): 258-275. 18 h. DOI: 10.1093/gji/ggae260 1365-246X https://hdl.handle.net/20.500.12008/51079 10.1093/gji/ggae260 |
| dc.language.none.fl_str_mv | en eng |
| dc.publisher.none.fl_str_mv | Oxford |
| dc.relation.none.fl_str_mv | Geophysical Journal International, 2024, 239(1): 258-275. |
| dc.rights.none.fl_str_mv | info:eu-repo/semantics/openAccess Licencia Creative Commons Atribución (CC - By 4.0) |
| dc.source.none.fl_str_mv | reponame:COLIBRI instname:Universidad de la República instacron:Universidad de la República |
| dc.subject.none.fl_str_mv | Seismic discontinuities Crustal structure Large igneous provinces |
| dc.title.none.fl_str_mv | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform |
| dc.type.none.fl_str_mv | Artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| description | The crust of the South American platform recorded imprints of dynamic processes related with the opening of the Central and South Atlantic but has not been well measured. Crustal structure can be retrieved from teleseismic receiver functions using H–κ stacking, but nearly parallel stripes of high stacking values existing in stacking images for seismic stations in sedimentary area cause difficulties in identifying solutions. We show that some seemingly spurious stripes that do not point to any layer solution are helpful in the identification of the solution position. With the aid of the auxiliary stripes, we retrieved thicknesses and Vp/Vs of sedimentary and crystalline crust for 65 permanent stations of the Brazilian Seismographic Network and six new portable seismic stations in Brazil and Uruguay. The resulted sedimentary thickness and Vp/Vs exhibit a good correlation with the Phanerozoic sediments in the South American basins. The crust of Parana–Etendeka ´ Large Igneous Province (LIP) had been expected to be more mafic since it had ever been penetrated by mantle magma in the Cretaceous related to the south Atlantic opening. However, we found very low Vp/Vs (1.67) in the crystalline crust beneath the LIP, implying a more felsic crust and that no significant mafic intruding/underplating has occurred in the region. The more felsic crust may be formed in a special evolution early than the magmatic event, or during the magmatic event by releasing crustal volatiles. The resulted sedimentary thickness and Vp/Vs ratios exhibit a good correlation with the Phanerozoic sediments in the South American basins, which implies that Triassic–Jurassic and Cretaceous magmatism did not cause significant metamorphism in sediments formed before the magmatic events. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | anni_cc57be70e40d4fce8d2d6408fe01811b |
| identifier_str_mv | Meijian, A, Feng, M, Assumpçao, M [y otros autores]. "Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform". Geophysical Journal International. [en línea] 2024, 239(1): 258-275. 18 h. DOI: 10.1093/gji/ggae260 1365-246X 10.1093/gji/ggae260 |
| instacron_str | Universidad de la República |
| institution | Universidad de la República |
| instname_str | Universidad de la República |
| language | eng |
| language_invalid_str_mv | en |
| network_acronym_str | anni |
| network_name_str | oai-lr-anni |
| oai_identifier_str | oai:colibri.udelar.edu.uy:20.500.12008/51079 |
| publishDate | 2024 |
| publishDateSort | 2024 |
| publisher.none.fl_str_mv | Oxford |
| reponame_str | COLIBRI |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | Licencia Creative Commons Atribución (CC - By 4.0) |
| spelling | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platformMeijian, AnFeng, MeiAssumpçao, Marcelo SBianchi, Marcelo BFrança, George SRocha, Marcelo PSánchez Bettucci, LedaSeismic discontinuitiesCrustal structureLarge igneous provincesThe crust of the South American platform recorded imprints of dynamic processes related with the opening of the Central and South Atlantic but has not been well measured. Crustal structure can be retrieved from teleseismic receiver functions using H–κ stacking, but nearly parallel stripes of high stacking values existing in stacking images for seismic stations in sedimentary area cause difficulties in identifying solutions. We show that some seemingly spurious stripes that do not point to any layer solution are helpful in the identification of the solution position. With the aid of the auxiliary stripes, we retrieved thicknesses and Vp/Vs of sedimentary and crystalline crust for 65 permanent stations of the Brazilian Seismographic Network and six new portable seismic stations in Brazil and Uruguay. The resulted sedimentary thickness and Vp/Vs exhibit a good correlation with the Phanerozoic sediments in the South American basins. The crust of Parana–Etendeka ´ Large Igneous Province (LIP) had been expected to be more mafic since it had ever been penetrated by mantle magma in the Cretaceous related to the south Atlantic opening. However, we found very low Vp/Vs (1.67) in the crystalline crust beneath the LIP, implying a more felsic crust and that no significant mafic intruding/underplating has occurred in the region. The more felsic crust may be formed in a special evolution early than the magmatic event, or during the magmatic event by releasing crustal volatiles. The resulted sedimentary thickness and Vp/Vs ratios exhibit a good correlation with the Phanerozoic sediments in the South American basins, which implies that Triassic–Jurassic and Cretaceous magmatism did not cause significant metamorphism in sediments formed before the magmatic events.OxfordMeijian AnFeng MeiAssumpçao Marcelo SBianchi Marcelo BFrança George SRocha Marcelo PSánchez Bettucci Leda, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ciencias Geológicas.2025-08-18T15:56:00Z2025-08-18T15:56:00Z2024Artículoinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion18 happlication/pdfMeijian, A, Feng, M, Assumpçao, M [y otros autores]. "Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform". Geophysical Journal International. [en línea] 2024, 239(1): 258-275. 18 h. DOI: 10.1093/gji/ggae2601365-246Xhttps://hdl.handle.net/20.500.12008/5107910.1093/gji/ggae260reponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaenengGeophysical Journal International, 2024, 239(1): 258-275.South AmericaLas obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad de la República.(Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución (CC - By 4.0)oai:colibri.udelar.edu.uy:20.500.12008/510792026-04-14T10:10:56Z |
| spellingShingle | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform Meijian, An Seismic discontinuities Crustal structure Large igneous provinces |
| status_str | publishedVersion |
| title | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform |
| title_full | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform |
| title_fullStr | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform |
| title_full_unstemmed | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform |
| title_short | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform |
| title_sort | Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform |
| topic | Seismic discontinuities Crustal structure Large igneous provinces |
| url | https://hdl.handle.net/20.500.12008/51079 |