The role of tectonic inheritance in the development of an Andean retroarc foreland basin system: The Acre Basin (NW Brazil)

Souza de Oliveira, Rick; Mary Vidotti, Roberta

doi:10.1016/j.marpetgeo.2023.106645

Marine and Petroleum Geology

2024

DOI: 10.1016/j.marpetgeo.2023.106645

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The role of tectonic inheritance in the development of an Andean retroarc foreland basin system: The Acre Basin (NW Brazil)

Rick Souza de Oliveira,

Roberta Mary Vidotti

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Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform

An,

Feng,

Assumpção

et al. 2024

Geophysical Journal International

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Summary 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 6 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 Paraná–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.

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Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform

An,

Feng,

Assumpção

et al. 2024

Geophysical Journal International

View full text Add to dashboard Cite

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The role of tectonic inheritance in the development of an Andean retroarc foreland basin system: The Acre Basin (NW Brazil)

Cited by 1 publication

References 84 publications

Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform

Influence of upwelling mantle magmas on cratonic crust implied from Vp/Vs beneath South America platform

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