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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 3
Clim. Past, 14, 255–270, 2018
https://doi.org/10.5194/cp-14-255-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Clim. Past, 14, 255–270, 2018
https://doi.org/10.5194/cp-14-255-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 05 Mar 2018

Research article | 05 Mar 2018

Astronomical tunings of the Oligocene–Miocene transition from Pacific Ocean Site U1334 and implications for the carbon cycle

Helen M. Beddow et al.

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Cited articles

Barckhausen, U., Ranero, C. R., Cande, S. C., Engels, M., and Weinrebe, W.: Birth of an intraoceanic spreading center, Geology, 36, 767–770, 2008.
Beddow, H. M., Liebrand, D., Sluijs, A., Wade, B. S., and Lourens, L. J.: Global change across the Oligocene-Miocene transition: High-resolution stable isotope records from IODP Site U1334 (equatorial Pacific Ocean), Paleoceanography, 31, 81–97, https://doi.org/10.1002/2015PA002820, 2016.
Berner, R. A., Lasaga, A. C., and Garrels, R. M.: The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years, Am. J. Sci., 283, 641–683, https://doi.org/10.2475/ajs.283.7.641, 1983.
Billups, K., Pälike, H., Channell, J. E. T., Zachos, J. C., and Shackleton, N. J.: Astronomic calibration of the late Oligocene through early Miocene geomagnetic polarity time scale, Earth Planet. Sc. Lett., 224, 33–44, https://doi.org/10.1016/j.epsl.2004.05.004, 2004.
Broecker, W. S.: Glacial to interglacial changes in ocean chemistry, Prog. Oceanogr., 11, 151–197, 1982.
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Short summary
We present two astronomy-based timescales for climate records from the Pacific Ocean. These records range from 24 to 22 million years ago, a time period when Earth was warmer than today and the only land ice was located on Antarctica. We use tectonic plate-pair spreading rates to test the two timescales, which shows that the carbonate record yields the best timescale. In turn, this implies that Earth’s climate system and carbon cycle responded slowly to changes in incoming solar radiation.
We present two astronomy-based timescales for climate records from the Pacific Ocean. These...
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