Abstract
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.
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