Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.t21d..05a&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #T21D-05
Astronomy and Astrophysics
Astronomy
1520 Magnetostratigraphy, 1535 Reversals (Process, Timescale, Magnetostratigraphy), 1714 Geomagnetism And Paleomagnetism
Scientific paper
High-resolution carbonate and colour reflectance records are presented for middle Miocene cyclic shallow lacustrine to distal alluvial floodplain deposits of the Calatayud basin (NE Spain). Spectral analysis results and bandpass filters of the proxy records in the depth domain show a dominant peak at ~1.7 m which corresponds with the average thickness of the basic (small-scale) mudstone-carbonate cycle. The magnetostratigraphy of the composite section provided a GPTS-based age model that was used to transform the proxy depth-records into time series. Subsequent spectral analysis results reveal periodicities of 23, 41 and 400 kyr and to a lesser extent of 100 kyr, and hence unambiguously demonstrate an astronomical origin. Following the determination of inferred phase relations between the different scales of sedimentary and astronomical cycles, an astronomical tuning of the sedimentary cycles to the astronomical time-series is presented. The tuning provides astronomical ages for the polarity reversals (and potential cryptochrons) in the time interval between 12.9 and 10.6 Ma. These ages are independently confirmed by sea-floor spreading rates.
Abdul Aziz Hayfaa
Hilgen Frits
Krijgsman Wout
Langereis C.
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