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- W2488943072 abstract "Stable isotopic analyses of bulk carbonates recovered from Ontong Java Plateau during Ocean Drilling Program (ODP) Leg 192 (Holes 1183A and 1186A) show an ~0.5‰ increase in δ18O values from the upper Campanian/lower Maastrichtian to the upper Maastrichtian. This shift is consistent with widespread evidence for cooling at this time. Similar shifts were found at other localities on Ontong Java Plateau (Deep Sea Drilling Project [DSDP] Sites 288 and 289 and ODP Site 807) and at DSDP Site 317 on Manihiki Plateau. These data extend evidence for Maastrichtian cooling into the southwestern tropical and subtropical Pacific. The record of apparent cooling survives despite a significant diagenetic overprint at all sites. Comparing average Maastrichtian δ18O values among sites suggests that diagenesis caused δ18O to first be shifted toward higher values and then back toward lower values as burial depth increased. Carbon isotopes at the six sites show no apparent primary shifts, but at four sites, the Cretaceous/Tertiary boundary interval coincides with a negative excursion attributed to alteration of sediments near the boundary. 1MacLeod, K.G., and Bergen, J.A., 2004. Apparent cooling in the tropical Pacific during the Maastrichtian and diagenetic artifacts in Late Cretaceous stable isotopic trends in bulk carbonate from Ontong Java Plateau. In Fitton, J.G., Mahoney, J.J., Wallace, P.J., and Saunders, A.D. (Eds.), Proc. ODP, Sci. Results, 192, 1–15 [Online]. Available from World Wide Web: . [Cited YYYYMM-DD] 2Department of Geological Sciences, University of Missouri, Columbia MO 65211-1380, USA. macleodk@missouri.edu 3BP America, 501 Westlake Park Boulevard, Houston TX 77079, USA. Initial receipt: 31 July 2003 Acceptance: 29 January 2004 Web publication: ## Month 2004" @default.
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- W2488943072 date "2004-04-16" @default.
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- W2488943072 title "Apparent Cooling in the Tropical Pacific during the Maastrichtian and Diagenetic Artifacts in Late Cretaceous Stable Isotopic Trends in Bulk Carbonate from Ontong Java Plateau" @default.
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- W2488943072 doi "https://doi.org/10.2973/odp.proc.sr.192.108.2004" @default.
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