GLACIO-EUSTATIC VARIATIONS RELATED TO MILANKOVITCH CYCLE BAND CONTROLLING THE UPPER MIOCENE CARBONATE SEDIMENTATION IN THE SOUTHERN PART OF THE SANTOS BASIN.The geological record of orbital-driven cycles in a succession of the upper Miocene carbonate rocks present in the Santos Basin, sotheastern Brazil, were studied in detail using geophysical logs, seismic sections, isotopic and biostratigraphic data. Spectral analyses performed on gamma-ray revealed 5 cycles interpreted to be related to eccentricity (100 and 410 ka), the time span of that carbonated deposits were estimated 2.05 Ma following an accumulation rate that ranges from 18.8 to 28.1 cm/ka. The accumulation rate changes were connected with the relative position ofthe wells on the Platform. These glacio-eustatic cycles are associated with a geological setting of relatively constant subsidence and sea level increase (Highstand Sistem Tract).Keywords: Cyclostratigraphy, Carbonate sedimentation, glacio-eustatic cycles, Santos Basin.
Resumo 0 registro de ciclos de Milankovitch em uma sucessao sedimentar carbonatica do Mioceno superior da Bacia deSantos foi estudado em detalhe por meio da integracao de perfis geofisicos, dados sismicos e bioestratignificos. Atraves da analise espectral dos perfis de raios gama foi possivel caracterizar 5 ciclos que foram interpretados como de excentricidade (410 e 100 ka), estimando urn periodo de 2,05 Ma para a sedimentacao destes dep6sitos carbonaticos, As taxas de acumulacao calculadas variam de 18,8 a 28,1 cm/ka e estao diretamente relacionadas as diferentes posicoes amostradas pelos pecos na plataforma. Esses ciclos de origem glacio-eustatica sao interpretados como formados em urn contexto geol6gico de subida relativa do nivel do mar (Trato de Sistema de Mar Alto) e de subsidencia relativamente constante.Palavras-chave: Cicloestratigrafia, Sedimentacao carbonatica, ciclos glacio-eustaticos, Bacia de Santos.
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