Quaternary stable oxygen isotope record of planktonic foraminifera from ODP Site 806 on the Ontong Java Plateau ...

• Main Authors: Berger, Wolfgang H, Bickert, Torsten, Schmidt, Heike, Wefer, Gerold
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1993
• Subjects: Drilling/drill rig; Leg130; Joides Resolution; Ocean Drilling Program ODP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.696434; https://doi.pangaea.de/10.1594/PANGAEA.696434

We present an oxygen isotope record that can serve as a new standard for Quaternary chronology in the western Pacific. The record is not entirely without problems. A coring gap misses Isotope Stage 19, which contains the Brunhes/Matuyama boundary. We bridged the gap by importing the corresponding portion of the record from adjacent Hole 805C. By counting the cycles related to obliquity, within the completed delta18O record, we date the Brunhes/Matuyama boundary at 792 ka (+/-10 k.y.), in excellent agreement with previous estimates based on tuning to astronomical signals and with recent radiometric determinations. Thus, the conventional age of 730 ka for this boundary should be abandoned.The major feature of the record is the appearance of a strong component in the band centered on 100 k.y., near 900 ka. At this time, the obliquity-dominated fluctuations give way to eccentricity-dominated fluctuations (whereas precession-related signals remain insignificant throughout). It is not necessary to call for a ... : Supplement to: Berger, Wolfgang H; Bickert, Torsten; Schmidt, Heike; Wefer, Gerold (1993): Quaternary oxygen isotope record of pelagic foraminifers: Site 806, Ontong Java Plateau. In: Berger, WH; Kroenke, LW; Mayer, LA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 130, 381-395 ...