Chronostratigraphic framework for the IODP Expedition 318 co

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TitleChronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstructionAbstractThe Integrated Ocean Drilling Program Expedition 318 to the Wilkes Land margin of Antarctica recovered a sedimentary succession ranging in age from lower Eocene to the Holocene. Excellent stratigraphic control is key to understanding the timing of paleoceanographic events through critical climate intervals. Drill sites recovered the lower and middle Eocene, nearly the entire Oligocene, the Miocene from about 17Ma, the entire Pliocene and much of the Pleistocene. The paleomagnetic properties are generally suitable for magnetostratigraphic interpretation, with well-behaved demagnetization diagrams, uniform distribution of declinations, and a clear separation into two inclination modes. Although the sequences were discontinuously recovered with many gaps due to coring, and there are hiatuses from sedimentary and tectonic processes, the magnetostratigraphic patterns are in general readily interpretable. Our interpretations are integrated with the diatom, radiolarian, calcareous nannofossils and dinoflagellate cyst (dinocyst) biostratigraphy. The magnetostratigraphy significantly improves the resolution of the chronostratigraphy, particularly in intervals with poor biostratigraphic control. However, Southern Ocean records with reliable magnetostratigraphies are notably scarce, and the data reported here provide an opportunity for improved calibration of the biostratigraphic records. In particular, we provide a rare magnetostratigraphic calibration for dinocyst biostratigraphy in the Paleogene and a substantially improved diatom calibration for the Pliocene. This paper presents the stratigraphic framework for future paleoceanographic proxy records which are being developed for the Wilkes Land margin cores. It further provides tight constraints on the duration of regional hiatuses inferred from seismic surveys of the region. â"' 2012 American Geophysical Union. All Rights Reserved.AcknowledgementsWe are deeply grateful for the hard work of the entire shipboard party of IODP Expedition 318, including scientific, technical, and support staff. In particular, we wish to thank Maggie Hastedt, whose tireless and cheerful help in the paleomagnetic laboratory was essential to the success of our investigations. We thank Joe Smoot, Jan Backman, two anonymous reviewers, and the Editor, Rainer Zahn, for careful review which greatly improved the manuscript. This research used samples and data provided by the Integrated Ocean Drilling Program (IODP). Funding for this research was provided by NSF grants OCE1058858 and OCE1054497 to L.T.

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1st AuthorTauxe, L.AuthorTauxe, L.Stickley, C.Sugisaki, S.Bijl, P.Bohaty, S.Brinkhuis, H.Escutia, C.Flores, J.Houben, A.Iwai, M.JimÃ©nez-Espejo, F.McKay, R.Passchier, S.Pross, J.Riesselman, C.Rhl, U.Sangiorgi, F.Welsh, K.Klaus, A.Fehr, A.Bendle, J.Dunbar, R.Gonzlez, J.Hayden, T.Katsuki, K.Olney, M.Pekar, S.Shrivastava, P.Van De Flierdt, T.Williams, T.Yamane, M.Year2012JournalPaleoceanographyVolume27Number2DOI10.1029/2012PA002308URLhttps://www.scopus.com/inward/recor.....1d36141fc24a4ed0876867830Keywordsbiostratigraphychronostratigraphydemagnetizationdiatomdinoflagellate cystEocenehiatusHolocenemagnetostratigraphynanofossilOcean Drilling ProgrampaleoceanographyPaleogenepaleomagnetismradiolariareconstructionsediment coresedimentary sequenceseismic survey, AntarcticaEast AntarcticaWilkes Land, BacillariophytaDinophyceae, rank1

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TypeArticleCitationTauxe, L., Stickley, C., Sugisaki, S., Bijl, P., Bohaty, S., Brinkhuis, H., Escutia, C., Flores, J., Houben, A., Iwai, M., Jimenez-Espejo, F., McKay, R., Passchier, S., Pross, J., Riesselman, C., Rhl, U., Sangiorgi, F., Welsh, K., Klaus, A., Fehr, A., Bendle, J., Dunbar, R., Gonzlez, J., Hayden, T., Katsuki, K., Olney, M., Pekar, S., Shrivastava, P., Van De Flierdt, T., Williams, T. and Yamane, M. (2012) Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstruction. Paleoceanography, 27(2) doi:10.1029/2012PA002308 IdentifierTauxe2012Relevancerank1