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      The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance

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          Abstract

          Abstract Sedimentologic and stratigraphic studies of paleo-deserts from the Brazilian Cretaceous are of great potential to understand the paleoclimate and paleogeography of Gondwana during its final rifting stage. Herein, we describe and discuss two depositional units characterized by two distinct eolian systems that are bounded by a long-lived unconformity. The Lower Unit (Barremian/Aptian) encompasses a wet eolian system composed of dune, interdunes, and ephemeral alluvial deposits. A continuous paleosol horizon in the upper part of the Lower Unit records dune stabilization and end of eolian accumulation, in a period of climate amelioration possibly in the late Aptian. The stratigraphic gap proposed for the unconformity (Cenomanian to Coniacian) coincides with the Cretaceous Thermal Maximum. The Upper Unit (Santonian?/Campanian) comprises dune fields of a dry eolian system capped by the Mata da Corda volcanic rocks. Cross stratification dip directions from both eolian systems shows transport towards SSW. Paleo-winds coming from the northeast quadrant reveal that the continental breakup and drifting had little influence on the surface winds in this Gondwana sector. The Upper Cretaceous paleo-winds are coherent with global paleo-circulation models, based on a high-pressure cell over the South Atlantic proto-ocean, favoring desertification in the inner portion of the southwestern Gondwana.

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          Most cited references 69

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          Bathymetry of trace fossils

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            Middle–Late Cretaceous climate of the southern high latitudes: Stable isotopic evidence for minimal equator-to-pole thermal gradients

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              Basic types of stratification in small eolian dunes

               RALPH HUNTER (1977)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                bjgeo
                Brazilian Journal of Geology
                Braz. J. Geol.
                Sociedade Brasileira de Geologia (São Paulo, SP, Brazil )
                2317-4889
                2317-4692
                2019
                : 49
                : 3
                Affiliations
                [3] São Paulo São Paulo orgnameUniversidade de São Paulo orgdiv1Instituto de Geociências Brazil pcgianni@ 123456usp.br
                [2] Campinas São Paulo orgnameUniversidade Estadual de Campinas orgdiv1Instituto de Geociências Brazil ladeira@ 123456unicamp.br
                [1] Rio Claro São Paulo orgnameUniversidade Estadual Paulista orgdiv1Instituto de Geociências e Ciências Exatas Brazil pamescolotti@ 123456outlook.com
                Article
                S2317-48892019000300309
                10.1590/2317-4889201920190057
                515651d9-ab2b-47fe-8935-78d6426b0d4c

                This work is licensed under a Creative Commons Attribution 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 98, Pages: 0
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