Calibration of Cycladophora davisiana events versus oxygen isotope stratigraphy in the subantarctic Atlantic Ocean - a stratigraphic tool for carbonate-poor Quaternary sediments

Brathauer, U, Abelmann, A, Gersonde, R, Niebler, HS and Fütterer, DK (2001) Calibration of Cycladophora davisiana events versus oxygen isotope stratigraphy in the subantarctic Atlantic Ocean - a stratigraphic tool for carbonate-poor Quaternary sediments. Marine Geology, 175(1-4). 167-181. doi:10.1016/S0025-3227(01)00141-4

Abstract

We calibrated the Cycladophora davisiana abundances versus oxygen isotope stratigraphy back to220ka for the subantarctic Atlantic Ocean. The relative abundances of C. davisiana and 18Omeasurements of benthic and planktic foraminifera have been determined in two sediment cores.Oxygen isotope stratigraphy has been used to date the C. davisiana records and to assignSPECMAP ages to the C. davisiana events. Comparisons with an existing calibration from thesubantarctic Indian Ocean show, that the C. davisiana events `b2, c1, c2, d, e1, e2, e3, f, h, i1 and i2occur synchronous within the errors of the oxygen isotope stratigraphy in the Indian and the Atlanticsectors of the Southern Ocean. Larger deviations occur only for events `b1 and `g. Furthermore,the long-term fluctuations in C. davisiana abundances have been studied in a sediment core coveringthe last 700kyr. Based on biostratigraphic extinction levels, ages for early Brunhes C. davisianaevents have been estimated. Major C. davisiana abundance maxima occur approximately every100ka in conjunction with glacial/interglacial cycles over the entire record.

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