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Authors: | Galeotti, Simone* Florindo, Fabio* Lanci, Luca* |
Title: | Cyclochronology of the Global Stratotype Section and Point for the Eocene/Oligocene boundary | Journal: | Palaeogeography, Palaeoclimatology, Palaeoecology | Series/Report no.: | /594 (2022) | Publisher: | Elsevier | Issue Date: | 15-May-2022 | DOI: | 10.1016/j.palaeo.2022.110958 | Abstract: | Spectral analyses of high-resolution records from the upper Eocene-lower Oligocene from the Massignano section, GSSP for the Eocene/Oligocene (E/O) boundary, and the nearby Massicore reveal orbitally controlled fluctuations in the percent concentration of calcium carbonate (wt% CaCO3) and magnetic susceptibility. Extraction of orbital components provides a consistent cyclochronology for the two sites that straddles the E/O boundary. Detection of longer-term modulation in the short eccentricity enabled tuning to the astronomical solution and development of a robust astrochronology for the E/O boundary transition in the GSSP section. Correlation with astrochronologically dated records allowed us to identify the local sedimentary response to the global paleoclimatic and palaeoceanographic events that characterize the greenhouse-icehouse transition during the late Eocene-early Oligocene. |
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