Paleomagnetism and geochronology of early Middle Pleistocene depositional sequences near Rome: comparison with the deep-sea 18 O record

Details Paleomagnetism and geochronology of early Middle Pleistocene depositional sequences near Rome: comparison with the deep-sea 18 O record Paleomagnetism and geochronology of early Middle Pleistocene depositional sequences near Rome: comparison with the deep-sea 18 O record

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.159..147m&link_type=abstract

Earth and Planetary Science Letters, vol. 159, Issue 3-4, pp.147-164

Astronomy and Astrophysics

Astronomy

3

Sequence Stratigraphy, Paleomagnetism, Sea-Level Changes, Brunhes Epoch, Matuyama Epoch, Reversals, Mediterranean Region

Scientific paper

A sequence-stratigraphic analysis was carried out on clastic coastal deposits (Ponte Galeria Formation - PGF) of the Tiber River delta, cropping out to the southwest of Rome, in order to correlate these sequences to Pleistocene eustasy. Tectonic subsidence affected sedimentation, but is distinguished from the glacio-eustatic signal, showing that the PGF consists of four depositional sequences that correlate to two fourth-order cycles. A paleomagnetic investigation of clay horizons deposited before and after the Brunhes-Matuyama reversal, combined with 40 Ar/ 39 Ar ages from a tuff horizon within the PGF, constrain the timing of the relative sea-level changes and allow us to tie it to the astronomically calibrated deep-sea 18 O record. The Brunhes-Matuyama boundary in the PGF postdates a set of highstand systems tract sediments, suggesting that the reversal occurs late in 18 O stage 19. This position is consistent with the recent study of deep-sea cores by Bassinot et al. [Earth Planet. Sci. Lett. 126 (1994) 91-108]. The assumption of a common continental stage marking the start of the Middle Pleistocene ( 18 O stage 22) in the Mediterranean region is not supported by the Tiber River sections which, in our interpretation, begin at stage 20.

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