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• W1498587748 abstract "Ocean Drilling Program (ODP) Leg 202 has opened a new window into understanding late Paleogene and Neogene global environmental change by providing high-quality sediment sequences from a previously unsampled region, the eastern South Pacific. Eleven sites (1232– 1242) that record variations on timescales ranging from decades to tens of millions of years were drilled and investigated on transects of both depth (489–4072 m) and latitude (41°S–8°N). Building on the shipboard results presented in the Leg 202 Initial Reports volume, postcruise research has significantly improved the stratigraphic framework and provided new insights into climate-related processes, which operate on different timescales and are relevant to hypotheses concerning the bipolar “see-saw” climate mechanism, orbitally driven changes in the continent-ocean-ice-atmosphere system and tectonic processes associated with the uplift of the Andes, closure of the Central American Seaway, and major expansions of polar ice sheets. Stable isotope records and refinements in bioand magnetostratigraphy in combination with orbitally tuned cyclostratigraphy significantly improved the Pleistocene stratigraphy at Sites 1233 and 1234, the Miocene–Pliocene stratigraphy at Sites 1236, 1237, 1239, and 1241, and the Oligocene stratigraphy around the late Oligocene climate optimum at Site 1237. Site 1233 filled a crucial gap in the stratigraphic and paleoceanographic archive of the South Pacific sector of the Southern Ocean by providing an outstanding reproducible accelerator mass spectrometry (AMS) 14C-dated paleomagnetic record of centennialand millennial-scale variability, representing regional variations in environmental/climatic conditions for the past 70,000 yr. With regard to the Cenozoic timetable, the continuous and complete sedimentary 1Tiedemann, R., and Mix, A., 2007. Leg 202 synthesis: southeast Pacific paleoceanography. In Tiedemann, R., Mix, A.C., Richter, C., and Ruddiman, W.F. (Eds.), Proc. ODP, Sci. Results, 202: College Station, TX (Ocean Drilling Program), 1–56. doi:10.2973/ odp.proc.sr.202.201.2007 2Alfred Wegener Institute for Polar and Marine Research, Section Marine Geology and Paleontology, Columbusstrasse, D-27568 Bremerhaven, Germany. rtiedemann@awi-bremerhaven.de 3College of Oceanic and Atmospheric Sciences, COAS Administration Building 104, Oregon State University, Corvallis OR 97331-5503, USA. Initial receipt: 14 June 2006 Acceptance: 12 February 2007 Web publication: 20 March 2007" @default.
• W1498587748 created "2016-06-24" @default.
• W1498587748 creator A5071535930 @default.
• W1498587748 creator A5074027743 @default.
• W1498587748 date "2007-03-20" @default.
• W1498587748 modified "2023-09-25" @default.
• W1498587748 title "Leg 202 synthesis: southeast Pacific paleoceanography" @default.
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