Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.121..533k&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 121, no. 3/4, p. 533-547
Astronomy and Astrophysics
Astronomy
19
Geochronology, Paleomagnetism, Stratigraphy, Tertiary Period, Demagnetization, Mediterranean Sea, Polarity, Polarization Characteristics, Sedimentary Rocks
Scientific paper
The Tortonian/Messinian boundary is marked by the first occurence datum (FOD) of Globorotalia conomiozea which is found all over Crete in open-marine marls with good paleomagnetic properties. Within the framework of the MIOMAR project, the previously studied sections of Langereis et al. have been extended and (partly) resampled. Here, we present new magnetostratigraphic and biostratigraphic results from sections on eastern Crete (Faneromeni), central Crete (Kastelli) and western Crete (Potamida and Skouloudhiana) supplemented by cyclostratigraphic data. The recently developed geomagnetic polarity time scale (CK92) of Cande and Kent allows an unambiguous correlation of the polarity sequences on Crete. The FOD of G. conomiozea occurs in the reversed interval of anomaly C3Bn.1r. This leads to a new age determination of 6.92 Ma for the Tortonian/Messinian boundary and a duration of 1.76 Myr for the Messinian. A slightly modified version of CK92-if we use more recent age estimates-provides an age of 7.10 Ma and a duration of 1.78 Myr, respectively. Bipartite sedimentary cycles are distinctly present in the Cretan sections studied. Assuming that these cycles are precession-induced and using an average periodicity of 21.7 kyr enables us to independently estimate the duration of the successive individual polarity zones. The astronomically derived durations of the Cretan polarity zones are in good agreement with CK92, but are approximately 10% shorter.
Hilgen Frederik J.
Krijgsman Wout
Langereis Cor G.
Zachariasse Willem Jan
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