Zoneamento paleoclimático do Quaternário da bacia de Santos com base em foraminíferos planctônicos

Abstract

The climatic zones based on planktonic foraminifera recovered from two piston cores collected on the slope of the Santos Basin, has shown the record of climate oscillations over the last ~620 ka. Seven zones and 14 subzones were recognized, represented by glacial (zones U, W and Y; subzones U2, U1, W2, W1, Y2, Y1B, Y1A) and interglacial intervals (zones T, V and X; subzones V3, V2B, V2A, V1, X1 to X3) of Pleistocene and the Holocene (zone Z). The Pulleniatina plexus allowed the division of subzone V2 in two (V2B and V2A) and provided eight regional correlation horizons along the subzones V3 and V2. The coiling direction of Globorotalia truncatulinoides helped the recognition of boundaries between subzones U2/U1, V2B/V2A, X3/X2 and X2/X1, showing as a useful tool for the refinement of the zones and subzones of the Quaternary. The permanent presence of suggests a constant influence of cold and productive waters over the past ~620 ka, especially in the southern part of the study area. © 2012 by the Sociedade Brasileira de Paleontologia.