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Direct U–Th dating of marine sediments from the two most recent interglacial periods

Nature volume 383, pages 242–244 (1996)Cite this article

Abstract

A KNOWLEDGE of the age of marine sediments is necessary to determine the timing of events and rates of processes in the marine realm, and the relationships among marine and other climatically sensitive records. The establishment of an accurate chronology for Pleistocene marine sediments beyond the range of radiocarbon dating (approximately the past 45 kyr) has therefore been a goal of palaeoceanographers for decades. Early attempts1,2 based on measurements of the radionuclides 230Th and 231Pa were beset with problems, and subsequent studies focused on tying fluctuations in marine sediment oxygen-isotope records to events such as the formation of coral reef terraces and changes in the Earth's magnetic polarity3,4, and tuning the resultant chronologies to the Earth's orbitally driven insolation variations5–8. But these chronologies (especially the age and duration of the last interglacial period) have been challenged by several studies9–12, raising questions about the fundamental cause of Pleistocene climate fluctuations. Here we report the direct U–Th dating of aragonite-rich marine sediments from the Bahamas, and present an accurately dated marine oxygen-isotope record for the last two interglacials. We obtain dates of 120–127 kyr BP for the last interglacial and 189–190 kyr BP for the late stage 7 interglacial. These dates are in accord with the general theory of orbitally forced climate fluctuations and demonstrate the potential of our direct-dating approach for developing an absolute chronology for the Pleistocene marine oxygen-isotope record.

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Author information

Authors and Affiliations

  1. Department of Oceanography, Texas A&M University, College Station, Texas, 77843, USA

    Niall C. Slowey

  2. Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York, 10964, USA

    Gideon M. Henderson

  3. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, 02543, USA

    William B. Curry

Authors
  1. Niall C. Slowey
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  2. Gideon M. Henderson
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  3. William B. Curry
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Slowey, N., Henderson, G. & Curry, W. Direct U–Th dating of marine sediments from the two most recent interglacial periods. Nature 383, 242–244 (1996). https://doi.org/10.1038/383242a0

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