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Changes in prevailing surface-palaeowinds of western Gondwana during Early Cretaceous

2020; Elsevier BV; Volume: 116; Linguagem: Inglês

10.1016/j.cretres.2020.104598

1095-998X

Claiton Marlon dos Santos Scherer, Raquel Gewehr de Mello, João Pedro Formolo Ferronatto, Francyne Bochi do Amarante, Adriano Domingos dos Reis, Ezequiel Galvão de Souza, Karin Goldberg,

Aeolian processes and effects

The comparison between reconstructed paleocurrent data from eolian dune deposits and models for atmospheric circulation shows that a monsoonal circulation pattern operated in the low latitudes of Gondwana until the Hauterivian. Trade winds from the Northern Hemisphere crossed the Equator and were re-oriented to the south, shifting the Intertropical Convergence Zone to paleolatitudes around 25° S, where the convergence with westerlies winds occurred. The rupture of the monsoonal pattern and the establishment of a zonal pattern, characterized by dry trade winds blowing to NW in the low latitudes of Gondwana, occurred in the Barremian as a result of the fragmentation of Gondwana.