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Geological Society, London, Special Publications; 2004; v. 229; p. 83-111;
DOI: 10.1144/GSL.SP.2004.229.01.07
© 2004 Geological Society of London

Biostratigraphy

Lower Cretaceous planktonic foraminiferal and nannofossil biostratigraphy of Ontong Java Plateau sites from DSDP Leg 30 and ODP Leg 192

P. J. Sikora1 & J. A. Bergen2

1 Energy and Geoscience Institute at the University of Utah, 423 Wakara Way, Ste 300, Salt Lake City, UT 84108, USA psikora{at}egi.utah.edu
2 BP Exploration, 501 Wetlake Park Boulevard, P.O. Box 3092, Houston, TX 77253-3092, USA

The Lower Cretaceous sediments of the Ontong Java Plateau of the SW Pacific Ocean provide a depositional history for the period immediately following the termination of one of the largest extrusive igneous events of the Phanerozoic eon. A more complete stratigraphic record is formulated of this critical event in Earth’s history than previously available by integration of previous data and new analyses from DSDP Leg 30 sites combined with shipboard and post-cruise analyses from ODP Leg 192. The oldest sediment occurs within the upper part of the Leupoldina cabri planktonic foraminiferal zone, indicating equivalence with the last half of Oceanic Anoxic Event (OAE) 1a of which the Ontong Java eruption is a postulated cause. The remainder of the Aptian section is marked by major disconformities, with little section in common between central and marginal plateau sites. The Aptian-Albian boundary is conformable at both Leg 192 Sites 1183 and 1186 based on integration of biostratigraphy and preliminary {delta}13C data. However, the overall Albian interval is very incomplete, with regional distribution noted for only the lowermost and upper Albian sections.