The Oligocene-Miocene succession of Campos Basin consists of rhythmical interbedding of marlstones and mudstones, with few chalk and turbidite layers, deposited in a bathyal environment. The hemipelagic sedimentation has recorded the orbital beat of precession, obliquity and eccentricity, based on spectral analyses of calcium carbonate content data, taken from core samples. A study of oxygen stable isotopes has allowed the recognition of significant fluctuations in d (super 18) O values for the Oligocene/lower Miocene succession. These sediments have recorded important oceanographic events such as the Oi1, Oi2, and Oi2a recognized by Miller et al. (1991) in DSDP boreholes, and the influence of the Antarctic glaciations. The results of this study confirm that global geochemical changes in the marine environment provide means for reliable chronostratigraphic correlations between oceanic and marginal basins, which is thought to contribute to a more accurate evaluation of biologic, sedimentologic and tectonic events. The existence of intervals with in-and out-of-phase d (super 18) O related to %CaCO (sub 3) , reflects the importance of regional events of carbonate productivity versus siliciclastic dilution in the deep-water and its relationship with the global oscillations of the d (super 18) O record. The combination of cyclostratigraphy and chemostratigraphy has shown that there still is a vast area to be explored in order to understand ancient sedimentary records.

West: -74.0000 East: -34.0000 North: 5.1500 South: -34.0000

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Provider: SEDIS Publication Catalogue

Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=1997-016396 (c.f. for more detailed metadata)

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