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Geology; May 1994; v. 22; no. 5; p. 463-467; DOI: 10.1130/0091-7613(1994)022<0463:QTSFTO>2.3.CO;2
© 1994 Geological Society of America
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Quaternary time scale for the Ontong Java Plateau: Milankovitch template for Ocean Drilling Program Site 806

Wolfgang H. Berger1, Memorie K. Yasuda1, Torsten Bickert2, Gerold Wefer2 and Toshiaki Takayama3

1 Scripps Institution of Oceanography, University of California, La Jolla, California 92093
2 Fachbereich Geowissenschaften, Universität Bremen, 28334 Bremen, Germany
3 Department of Geology, Kanazawa University, Kanazawa 920, Japan

A 2 m.y. oxygen isotope record of Globigerinoides sacculifer from the Ontong Java Plateau, based on cores from Ocean Drilling Program Leg 130, is dated by matching variations to an orbital template. The procedure allows us to present the most complete Quaternary record available for the western equatorial Pacific. The template-generating algorithm describes a balance between growth and melting of ice. Following basic Milankovitch theory, ice growth is taken as constant, while melting is taken to depend on summer insolation, current ice mass, and average past ice mass. Template settings must be changed once, between 1 and 1.2 Ma, to reflect a major shift in climate. Template fits are strikingly good over much of the record and can be used to detect and fill gaps from core breaks and other disturbances. One result of template dating is an exact age for the Brunhes-Matuyama magnetic reversal boundary, at 790 ±5 ka, as well as several other precise dates (900 ka for the middle Pleistocene climate shift; 1070, 1240, and 1450 ka for isotope stages 31, 37, and 47, respectively). Sedi- mentation rates fluctuate between 18 and 28 m/m.y., a ca. 400 ka cycle being the most prominent. Major anomalies arise within the transitional regime (1.2 to 1 Ma). The origin of the cycles is unknown; we propose productivity variations in the western equatorial Pacific.




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