noaa-ocean-17396 Central Pacific ODP865 d18O measurements covering the Early Paleogene Kozdon, R.; Kelly, D.C.; Kita, N.T.; Fournelle, J.H.; Valley, J.W. Central Pacific ODP865 d18O measurements covering the Early Paleogene 2014-11-04 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17396 Investigator R. Kozdon Investigator D.C. Kelly Investigator N.T. Kita Investigator J.H. Fournelle Investigator J.W. Valley earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,meters below sea floor earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,averaged,secondary ion mass spectrometry,N,Morozovella allisonensis and diagenetic carbonate; in situ measurements earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,null earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,averaged,secondary ion mass spectrometry,N,Morozovella subbotinae and diagenetic carbonate; in situ measurements earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,secondary ion mass spectrometry,N,Morozovella subbotinae and diagenetic carbonate; in situ measurements earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,secondary ion mass spectrometry,N,Morozovella allisonensis and diagenetic carbonate; in situ measurements earth science paleoclimate paleoceanography age,null,null,million years ago,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,secondary ion mass spectrometry,N,Morozovella aragonensis and diagenetic carbonate; in situ measurements earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,secondary ion mass spectrometry,N,Morozovella velascoensis and diagenetic carbonate; in situ measurements earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,averaged,secondary ion mass spectrometry,N,Morozovella velascoensis and diagenetic carbonate; in situ measurements earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,averaged,secondary ion mass spectrometry,N,Morozovella aragonensis and diagenetic carbonate; in situ measurements earth science paleoclimate paleocean oxygen isotopes geoscientificInformation 55200000 cal yr BP 48800000 cal yr BP Complete 18.440167 18.440167 -179.555667 -179.555667 -1530 -1530 Ocean Pacific Ocean Central Pacific Ocean ODP 865>LATITUDE 18.440167>LONGITUDE -179.555667 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Kozdon, R., D.C. Kelly, N.T. Kita, J.H. Fournelle, and J.W. Valley 2011 Paleoceanography 26 PA3206 10.1029/2010PA002056

Cool tropical sea surface temperatures (SSTs) are reported for warm Paleogene greenhouse climates based on the d18O of planktonic foraminiferal tests. These results are difficult to reconcile with models of greenhouse gas–forced climate. It has been suggested that this “cool tropics paradox” arises from postdepositional alteration of foraminiferal calcite, yielding erroneously high d18O values. Recrystallization of foraminiferal tests is cryptic and difficult to quantify, and the compilation of robust d18O records from moderately altered material remains challenging. Scanning electron microscopy of planktonic foraminiferal chamber-wall cross sections reveals that the basal area of muricae, pustular outgrowths on the chamber walls of species belonging to the genus Morozovella, contain no mural pores and may be less susceptible to postdepositional alteration. We analyzed the d18O in muricae bases of morozovellids from the central Pacific (Ocean Drilling Program Site 865) by ion microprobe using 10 µm pits with an analytical reproducibility of ±0.34‰ (2 standard deviations). In situ measurements of d18O in these domains yield consistently lower values than those published for conventional multispecimen analyses. Assuming that the original d18O is largely preserved in the basal areas of muricae, this new d18O record indicates Early Paleogene (~49–56 Ma) tropical SSTs in the central Pacific were 4°–8°C higher than inferred from the previously published d18O record and that SSTs reached at least ~33°C during the Paleocene-Eocene thermal maximum. This study demonstrates the utility of ion microprobe analysis for generating more reliable paleoclimate records from moderately altered foraminiferal tests preserved in deep-sea sediments. STUDY NOTES: In situ oxygen isotope data were acquired between 2009 and 2011 in the WiscSIMS Laboratory at UW-Madison by a CAMECA ims-1280 large radius ion microprobe. A 133Cs+ primary ion beam with an intensity of ~1.8 nA was focused to a diameter of ~10 µm. The typical secondary 16O- ion intensity was 3.0 x 10^9 cps, and 18O- and 16O- ions were simultaneously collected by two Faraday Cup detectors. Charging of the sample surface was compensated by Au-coating and an electron flood gun. Grains of UWC-3 calcite standard (d18O = 12.49 per mill V-SMOW, Kozdon et al. 2009) were cast in the center of each epoxy mount. Four to five consecutive measurements of UWC-3 calcite standard were performed before and after every set of 9-15 sample analyses. The average precision (reproducibility) for a set of bracketing standard analyses is ±0.34 per mil (2 SD). Detailed analytical protocols are described by Kita et al. 2009. A total of 283 measurements were performed, including 95 bracketing standard analyses.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kozdon2011/kozdon2011-865.txt Formatted Text File; d18O Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11