Michele J.T. Estrada

Universidade Federal de Uberlândia

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Luciano Alessandretti

Universidade Federal de Uberlândia

Lucas V. Warren

Universidade Estadual Paulista (Unesp)

Mariana Nunes Marçal Silva

Universidade Federal de Uberlândia

João V.O. Cunha

Universidade Federal de Uberlândia

Fernando Resende Honorato

Universidade Estadual de Campinas (UNICAMP)

Maurício G. M. Santos

Universidade Federal do ABC

Filipe Giovanini Varejão

Universidade Federal de Ouro Preto

Raul Rassi

Universidade Federal de Uberlândia

Cooperative Institutions

Universidade Federal de Uberlândia

Universidade de São Paulo

Universidade Estadual Paulista (Unesp)

Instituto de Geociencias

Sociedade Brasileira de Geofísica

Novelis (Canada)

Diagnostics for the Real World (United Kingdom)

Universidade Federal do Rio Grande do Sul

Universidade Federal de Minas Gerais

National Council for Scientific and Technological Development

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Uplifting mountains and shaking deserts: volcano-tectonic earthquakes revealed by soft-sediment-deformation structures in Upper Cretaceous aeolian deposits

Journal of Sedimentary Research (2023)

Luciano Alessandretti Lucas V. Warren Filipe Giovanini Varejão Raul Rassi Maurício G. M. Santos

ABSTRACT During the last stages of Gondwana fragmentation, large regions of the newly formed South American continent were covered by extensive deserts. Some parts of this continental landmass were synchronously affected by pronounced tectonism and magmatism, which were responsible for reshaping the regional topography. In this context, the southwestern part of the Sanfranciscana Basin in central Brazil is a key area for understanding this particular period in the geodynamic evolution of the South American continent. Aeolian deposits of the Posse Formation in the basin occur in direct association with volcanic rocks of the Upper Cretaceous Mata da Corda Group. Here, we report evidence of synsedimentary magmatism in direct association with soft-sediment-deformation structures, including flame structures, load casts and pseudonodules, water-escape structures, convolute lamination, faults, breccias, and clastic dikes, developed exclusively in aeolian sandstone and siltstone facies. The deformation features are interpreted as indicative of liquefaction, fluidization, and brittle behavior of the loose to partially lithified, wet sandy–silty sediments. The Late Cretaceous aeolian sedimentation is contemporaneous with the uplift of the Paranaíba High and associated magmatism in the Minas–Goiás Alkaline Province. In this context, these significant volcano-tectonic activities are considered to have triggered ductile to brittle deformation in the reported aeolian deposits.

Siltstone

10.2110/jsr.2021.143

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