An orbital origin for large oxygen isotopic shifts and sea-level changes during the Oligocene

Details An orbital origin for large oxygen isotopic shifts and sea-level changes during the Oligocene An orbital origin for large oxygen isotopic shifts and sea-level changes during the Oligocene

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmpp11a0555p&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #PP11A-0555

Astronomy and Astrophysics

Astronomy

9310 Antarctica, 9604 Cenozoic, 4267 Paleoceanography, 4556 Sea Level Variations

Scientific paper

Recently, it was shown that a relatively rare orbital congruence involving low-amplitude variance in obliquity and a minimum in eccentricity coincides at the Miocene/Oligocene boundary with a large increase in oxygen isotopes (Mi1 event) and ice volume, suggesting a possible causal mechanism for such events at the million-year timescale. We tested this idea against the Oligocene oxygen isotopic and sea-level records and the astronomical timescale of Shackleton et al. (1999). As in the Miocene, large isotopic shifts (Oi events; δ 18O >0.5\permil, with maximum values >2.7\permil) and sea-level changes (30-70 m) occurred in the Oligocene at the million-year timescale. Smaller variations in sea level (and corresponding isotopic values) characterize obliquity (104 years) and eccentricity (105 years) timescales: 15-20 m and 20-30 m, respectively. Our analysis shows that, as with the Mi1 event, Oi events relate to the anticipated orbital congruence - resolving one of the outstanding conundrums of the late Paleogene paleoclimate. It also provides support for the robustness of the astronomical time scale of Shackleton et al. (1999) for the Oligocene Epoch.

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