noaa-ocean-22811 Late Eocene marine Osmium isotope record from Italy, the Southern Atlantic, and the Eastern Pacific Paquay, F.S.; Ravizza, G.; Coccioni, R. Late Eocene marine Osmium isotope record from Italy, the Southern Atlantic, and the Eastern Pacific 2017-10-11 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22811 Investigator F.S. Paquay Investigator G. Ravizza Investigator R. Coccioni earth science paleoclimate paleoceanography 187Os/188Os,null,two standard error,dimensionless,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,Bulk Sediment Digestion by NiS Fire Assay earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,ODP site-core-section-depth designation earth science paleoclimate paleoceanography platinum,null,null,picogram per gram,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,bulk sediment; by isotope dilution earth science paleoclimate paleoceanography 187Os/188Os,null,null,dimensionless,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,Bulk Sediment Digestion by NiS Fire Assay earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,meters below seafloor earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,ODP site-core-section-depth designation. This study (30X-1W-15/17 to 30X-3W-144/146 and 30X-5W-97/98 to 30X-5W-113.5/115.5) and from Paquay et al. (2008). “R” indicates a duplicate analysis (different sample powder). earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,meters composite depth earth science paleoclimate paleoceanography 187Os/188Os,null,null,dimensionless,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,bulk sediment; Digestion by NiS fire assay earth science paleoclimate paleoceanography osmium,null,null,picogram per gram,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,bulk sediment; by isotope dilution; picogram Os per gram of dry sediment earth science paleoclimate paleoceanography iridium,null,null,picogram per gram,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,bulk sediment; by isotope dilution earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,Data source: This Study Or Dalai et al. 2006 EPSL 241:477-492 earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,meters section level earth science paleoclimate paleoceanography 187Os/188Os,null,two standard error,dimensionless,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,bulk sediment; Digestion by NiS fire assay earth science paleoclimate paleoceanography osmium,null,null,picogram per gram,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,bulk sediment; by isotope dilution earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean radiogenic isotope geoscientificInformation 36620000 cal yr BP 32843000 cal yr BP Complete -42.913687 43.5355 -135.3667 13.589333 -4828 -3702 Ocean Atlantic Ocean South Atlantic Ocean ODP 1090B>LATITUDE -42.913687>LONGITUDE 8.899737 Continent Europe Southern Europe Italy Massignano, Italy>LATITUDE 43.5355>LONGITUDE 13.589333 Ocean Pacific Ocean North Pacific Ocean ODP 1218>LATITUDE 8.8894>LONGITUDE -135.3667 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 Paquay, Francois S., Greg Ravizza, and Rodolpho Coccioni 2014 Geochimica et Cosmochimica Acta 144 238-257 10.1016/j.gca.2014.08.024

A reconstruction of seawater 187Os/188Os ratios during the late Eocene (∼36–34 Ma), based upon bulk sediment analyses from the sub-Antarctic Southern Atlantic Ocean (Ocean Drilling Program (ODP) Site 1090), Eastern Equatorial Pacific Ocean (ODP Sites 1218 and 1219) and the uplifted (land-based) Tethyan section (Massignano, Italy), confirms that the previously reported abrupt shift to lower 187Os/188Os is a unique global feature of the marine Os isotope record that occurs in magnetochron C16n.1n. This feature is interpreted to represent the change in seawater 187Os/188Os caused by the Popigai impact event. Higher in the Massignano section, two other iridium anomalies previously proposed to represent additional impact events do not show a comparable excursion to low 187Os/188Os, suggesting that these horizons do not record multiple large impacts. Comparison of records from three different ocean basins indicates that seawater 187Os/188Os begins to decline in advance of the Popigai impact event. At Massignano this decline coincides with a previously reported episode of elevated 3He flux, suggesting that increased influx of interplanetary dust particles (IDPs) contributed to the pre-impact shift in 187Os/188Os and not to the longer-term latest Eocene 187Os/188Os decline that occurred ∼1 million year after the Popigai impact event. STUDY NOTES: Provided Keywords: Osmium Isotope, Eocene

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-odp1218.txt NOAA Template File; ODP 1218 Osmium Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-odp1090b.txt NOAA Template File; ODP 1090B Osmium Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-massignano.txt NOAA Template File; Massignano Osmium Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11