Late Aptian long-lived glacio-eustatic lowstand recorded on the Arabian Plate

Authors


Florian Maurer, Maersk Olie og Gas A/S, Esplanaden 50, 1263 Copenhagen K, Denmark. Tel.: +45 3363 1790; fax: +45 3314 1554; e-mail: florian.maurer@maerskoil.com

Abstract

Terra Nova, 25, 87–94, 2013

Abstract

Compelling physical evidence for a Late Aptian lowstand with an amplitude of at least 50 m is presented in subsurface seismic and core data from the Arabian Plate. Biostratigraphic dating indicates that the fall and rise bracketing this lowstand were rapid, and that the lowstand lasted for around 5 ma with distinctly cyclic sedimentation at the 0.4–0.5 ma scale (eccentricity band). A glacio-eustatic mechanism is invoked as the most likely cause, which is supported by cooling indicated in oxygen isotope shifts and by evidence for a global expression of this lowstand from a number of locations at the mid and high latitudes. Hence, the Late Aptian data presented here document the longest Cretaceous sea-level lowstand, interpreted as the longest cooling phase during the Cretaceous greenhouse.

Ancillary