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Data report: regional stratigraphic correlation and a revised composite depth scale for IODP Expedition 3021

Matt O’Regan,2 Tatsuhiko Sakamoto,3 and John King2


Expedition 302 of the Integrated Ocean Drilling Program (IODP), also known as the Arctic Coring Expedition (ACEX), successfully penetrated a sequence of Cenozoic sediments draping the crest of the Lomonosov Ridge in the central Arctic Ocean. The cumulative sedimentary record spans the last 57 m.y. and was recovered from three sites located within 15 km of each other. Merging the recovered cores onto a common depth scale that accurately reflects their stratigraphic placement below the seafloor is a fundamental step toward interpreting this unique sedimentary record. However, the lack of overlapping recovery in adjacent holes and intervals of high core disturbance complicated traditional methods of stratigraphic correlation. Here we present a revised composite depth scale for the ACEX sediments, generated in part by performing a regional stratigraphic correlation with sediments recovered from previous expeditions to the Lomonosov Ridge. The revised depth scale also reassesses the offsets for cores in the upper 55 meters below seafloor, where no overlapping recovery was acquired, and proposes modifications to these depths.

1O’Regan, M., Sakamoto, T., and King, J., 2008. Data report: regional stratigraphic correlation and a revised composite depth scale for IODP Expedition 302. In Backman, J., Moran, K., McInroy, D.B., Mayer, L.A., and the Expedition 302 Scientists, Proc. IODP, 302: Edinburgh (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/​iodp.proc.302.202.2008

2Graduate School of Oceanography, University of Rhode Island, Narragansett RI 02882, USA.

3Institute For Research on Earth Evolution (IFREE), Japan Agency for Marine Earth Science and Technology (JAMSTEC), 2-15 Natsushima-Cho, Yokosuka-city, Kanagawa 237-0061, Japan.

Initial receipt: 24 September 2007
Acceptance: 11 March 2008
Publication: 17 June 2008
MS 302-202