Late Eocene marine Osmium isotope record from Italy, the Southern Atlantic, and the Eastern Pacific Paquay, F.S.; Ravizza, G.; Coccioni, R. Paquay, F.S. Ravizza, G. Coccioni, R. 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 earth science/paleoclimate/paleocean (ODP 1090B>LATITUDE -42.913687>LONGITUDE 8.899737) (Massignano, Italy>LATITUDE 43.5355>LONGITUDE 13.589333) (ODP 1218>LATITUDE 8.8894>LONGITUDE -135.3667) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Paquay, F.S. Investigator : Ravizza, G. Investigator : Coccioni, R. 2017-10-11 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22811 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-odp1218.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-odp1090b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-massignano.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-odp1218.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-odp1090b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-massignano.txt English https://www.ncdc.noaa.gov/paleo/study/22811 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-odp1218.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-odp1090b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/paquay2014/paquay2014-massignano.txt Paquay, Francois S., Greg Ravizza, and Rodolpho Coccioni2014The influence of extraterrestrial material on the late Eocene marine Os isotope recordGeochimica et Cosmochimica Acta144238-25710.1016/j.gca.2014.08.024 START YEAR: 36620000 cal yr BP * END YEAR: 32843000 cal yr BP -135.3667 -42.913687 13.589333 43.5355