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doi:10.2204/iodp.proc.320321.201.2012

Revised composite depth scales and integration of IODP Sites U1331–U1334 and ODP Sites 1218–1220¹

Thomas Westerhold,² Ursula Röhl,² Roy Wilkens,³ Heiko Pälike,⁴ Mitch Lyle,⁵ Tom Dunkley Jones,⁶ Paul Bown,⁷ Ted Moore,⁸ Shin-ichi Kamikuri,⁹ Gary Acton,¹⁰ Christian Ohneiser,¹¹ Yuhji Yamamoto,¹² Carl Richter,¹³ Peter Fitch,⁶ Howie Scher,¹⁴ Diederik Liebrand,⁴ and the Expedition 320/321 Scientists¹⁵

Abstract

To reconstruct the climate history of the equatorial Pacific, one major objective of the Pacific Equatorial Age Transect (PEAT) program is to compile a Cenozoic megasplice that integrates all available bio-, chemo-, and magnetostratigraphic data including key records from Ocean Drilling Program (ODP) Leg 199. In order to do so, extended postcruise refinements of the shipboard composite depth scales and composite records are required. Here, we present a revised depth scale of Integrated Ocean Drilling Program (IODP) Expedition 320 Sites U1331, U1332, U1333, and U1334 as well as Leg 199 Sites 1218, 1219, and 1220. The revised composite records were used to perform site-to-site correlation and integration of Leg 199 and Expedition 320 sites. Based on this decimeter-scale correlation, a high-resolution integrated paleomagnetic, calcareous nannofossil, and radiolarian stratigraphy for the equatorial Pacific is established that covers the time from 20 to 40 Ma. This sedimentary compendium from the equatorial Pacific will be the backbone for paleoceanographic reconstructions for the late Paleogene.

¹ Westerhold, T., Röhl, U., Wilkens, R., Pälike, H., Lyle, M., Jones, T.D., Bown, P., Moore, T., Kamikuri, S., Acton, G., Ohneiser, C., Yamamoto, Y., Richter, C., Fitch, P., Scher, H., Liebrand, D., and the Expedition 320/321 Scientists, 2012. Revised composite depth scales and integration of IODP Sites U1331–U1334 and ODP Sites 1218–1220. In Pälike, H., Lyle, M., Nishi, H., Raffi, I., Gamage, K., Klaus, A., and the Expedition 320/321 Scientists, Proc. IODP, 320/321: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.320321.201.2012

² Center for Marine Environmental Sciences, University of Bremen, 28359 Germany. Correspondence author: twesterhold@marum.de

³ Institute of Geophysics and Planetology, Univ. Hawaii, Honolulu HI 96822, USA.

⁴ School of Ocean & Earth Sci., Univ. Southampton S014 3ZH, UK.

⁵ Dept. of Oceanography, Texas A&M Univ., College Station TX 77845, USA.

⁶ Dept. of Earth Sci. and Engineering, Imperial College, London SW7 2AZ, UK.

⁷ Dept. of Earth Sci., Univ. College, London WC1E 6BT, UK.

⁸ Dept. of Geological Sci., Univ. Michigan, Ann Arbor MI 48109, USA.

⁹ Univ. Tsukuba, Ibaraki 305-8572, Japan.

¹⁰ Dept. of Geology, Univ. California, Davis CA 95616, USA.

¹¹ Geology Dept., Univ. Otago, Dunedin, NZ.

¹² Marine and Core Research Center, Kochi Univ., Kochi 783-8502, Japan.

¹³ Dept. of Geology and Energy Institute, Univ. Louisiana, Lafayette LA 70504, USA.

¹⁴ Dept. of Earth and Ocean Sci., Univ. South Carolina, Columbia SC 29208, USA.

¹⁵ Expedition 320/321 Scientists’ addresses.

Initial receipt: 3 February 2011
Acceptance: 29 June 2011
Publication: 2 January 2012
MS 320321-201

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