noaa-ocean-26090 Global Ocean Neodymium Isotope Data during the Campanian-Maastrichtian Haynes, S.J.; MacLeod, K.G.; Vande Guchte, A.; Rostami, M.A.; Poulsen, C.J.; Martin, E.E. Global Ocean Neodymium Isotope Data during the Campanian-Maastrichtian 2019-02-11 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/26090 Investigator S.J. Haynes Investigator K.G. MacLeod Investigator A. Vande Guchte Investigator M.A. Rostami Investigator C.J. Poulsen Investigator E.E. Martin earth science paleoclimate paleocean geochemistry geoscientificInformation 100000000 cal yr BP 60000000 cal yr BP Complete -51.533 48.516 -162.263 174.668 -5117 800 Ocean Atlantic Ocean North Atlantic Ocean ODP 1276A>LATITUDE 45.40533>LONGITUDE -44.785827 Ocean Pacific Ocean Western Pacific Ocean DSDP 289>LATITUDE -.499>LONGITUDE 158.512 Ocean Atlantic Ocean South Atlantic Ocean DSDP 358>LATITUDE -37.655>LONGITUDE -35.964 Ocean Atlantic Ocean North Atlantic Ocean DSDP 386>LATITUDE 31.187>LONGITUDE -64.249 Ocean Atlantic Ocean South Atlantic Ocean ODP 698A>LATITUDE -51.459>LONGITUDE -33.099 Ocean Atlantic Ocean South Atlantic Ocean DSDP 357>LATITUDE -30.42>LONGITUDE -35.57 Continent Africa Eastern Africa Tanzania TZ_2014>LATITUDE -8.949>LONGITUDE 39.333 Ocean Pacific Ocean Central Pacific Ocean DSDP 317A>LATITUDE -11.002>LONGITUDE -162.263 Ocean Atlantic Ocean South Atlantic Ocean DSDP 530A>LATITUDE -19.188>LONGITUDE 9.386 Ocean Atlantic Ocean North Atlantic Ocean ODP 1001A>LATITUDE 15.757>LONGITUDE -74.911 Ocean Pacific Ocean Western Pacific Ocean ODP 1186A>LATITUDE -.68>LONGITUDE 159.844 Ocean Atlantic Ocean South Atlantic Ocean DSDP 516>LATITUDE -30.2765>LONGITUDE -35.285 Ocean Atlantic Ocean South Atlantic Ocean ODP 1267>LATITUDE -28.098>LONGITUDE 1.711 Ocean Pacific Ocean Central Pacific Ocean DSDP 463>LATITUDE 21.35>LONGITUDE 174.668 Ocean Atlantic Ocean South Atlantic Ocean ODP 700B>LATITUDE -51.533>LONGITUDE -30.278 Ocean Atlantic Ocean North Atlantic Ocean DSDP 387>LATITUDE 32.3167>LONGITUDE -67.6667 Ocean Atlantic Ocean North Atlantic Ocean DSDP 550B>LATITUDE 48.516>LONGITUDE -13.438667 Ocean Atlantic Ocean South Atlantic Ocean DSDP 356>LATITUDE -28.287>LONGITUDE -41.088 Ocean Atlantic Ocean South Atlantic Ocean DSDP 361>LATITUDE -35.066>LONGITUDE 15.449 Ocean Atlantic Ocean South Atlantic Ocean ODP 1262>LATITUDE -27.186>LONGITUDE 1.577 Ocean Atlantic Ocean South Atlantic Ocean DSDP 525A>LATITUDE -29.071>LONGITUDE 2.985 Ocean Indian Ocean ODP 761B>LATITUDE -16.737>LONGITUDE 115.535 Ocean Pacific Ocean Western Pacific Ocean ODP 807C>LATITUDE 3.606>LONGITUDE 156.625 Continent Europe Southern Europe Spain Caravaca>LATITUDE 38.076>LONGITUDE -1.878 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 Haynes, S.J., MacLeod, K.G., Vande Guchte, A., Rostami, M.A., Poulsen, C.J., Martin, E.E. 2019 Geology in review Haynes, S.J., MacLeod, K.G., Vande Guchte, A., Rostami, M.A., Poulsen, C.J., and Martin, E.E. 2019 in preparation

Models for changing patterns of ocean circulation during the last 10 million years of the Cretaceous (late Campanian–Maastrichtian) have suggested increased downwelling occurred in the Southern Ocean and/or the North Atlantic as well as alternating between northern and southern high-latitude Pacific source regions across the interval. Existing data do not allow simple confirmation or rejection of any of the proposed models, and this uncertainty compromises investigations of the relationship between ocean circulation and climate. Here we use neodymium isotopes (eNd) preserved in fossilized fish debris to examine changes in Pacific circulation by comparing trends from the late Campanian through the Maastrichtian to patterns during a well-documented early Maastrichtian cooling pulse (EMCP). Pacific eNd data have similar values in late Campanian and late Maastrichtian samples but show a small negative eNd excursion that closely correlates with the EMCP. These observations argue against export of southern component waters into the Pacific and, combined with new modeling results of subsurface water mass age, suggest the southwestern Pacific to have been the dominant source region for Pacific intermediate and deep waters throughout the late Campanian–Maastrichtian. We propose that changes in eNd values during the EMCP are related to an increased rate of overturning rather than a shift in the source of Pacific bottom waters. STUDY NOTES: Late Campanian to Maastrictian Nd isotopic data from DSDP Sites289, 217, 356, 357, 358, 361, 386, 387, 463, 516, 525, 530, 550, OPD Sites 698, 700, 761, 807, 1001, 1262, 1267, 1276 and field samples from Caravaca, Spain and southeast Tanzania Provided Keywords: Cretaceous, ocean circulation, Nd isotopes, Pacific, South Atlantic

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/haynes2019/haynes2019-nd.txt NOAA Template File; Neodymium Isotope Data USA/NOAA DIF Version 9.8.4 2019-03-05 2019-03-05