noaa-ocean-21770 Antarctic Geochemistry Data and Mean Annual Temperature Reconstruction through the Eocene-Oligocene transition Passchier, S.; Ciarletta, D.J.; Miriagos, T.E. Antarctic Geochemistry Data and Mean Annual Temperature Reconstruction through the Eocene-Oligocene transition 2017-03-23 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/21770 Investigator S. Passchier Investigator D.J. Ciarletta Investigator T.E. Miriagos earth science paleoclimate climate reconstructions|paleoceanography depth,null,null,meter,null,climate reconstructions|paleoceanography,null,null,N,sample top below seafloor earth science paleoclimate climate reconstructions|paleoceanography depth,null,null,meter,null,climate reconstructions|paleoceanography,null,null,N,Meter composite depth top earth science paleoclimate paleoceanography inorganic compound index,sediment,null,dimensionless,null,paleoceanography,null,null,N,"chemical index of alteration: 100 times the molar ratio of Al2O3 and the sum of Al2O3, CaO, Na2O and K2O (Nesbitt and Young 1982)" earth science paleoclimate climate reconstructions|paleoceanography sample identification,null,null,null,null,climate reconstructions|paleoceanography,null,null,C,null earth science paleoclimate climate reconstructions|paleoceanography age,null,null,million years ago,null,climate reconstructions|paleoceanography,null,null,N,GTS2012 timescale earth science paleoclimate paleoceanography iron oxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography inorganic compound index,sediment,null,dimensionless,null,paleoceanography,null,null,N,S index: molar ratio of Na2O and K2O to Al2O3 (Sheldon et al 2002) earth science paleoclimate paleoceanography aluminum oxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography sodium oxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography potassium oxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography phosphorus pentoxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography titanium dioxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography magnesium oxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography calcium oxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate climate reconstructions|paleoceanography temperature,null,null,degree Celsius,annual,climate reconstructions|paleoceanography,null,null,N,calibraton of Sheldon et al. 2004 earth science paleoclimate paleoceanography silicon dioxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleoceanography manganese oxide,sediment,null,weight percent,null,paleoceanography,normalized,inductively-coupled plasma atomic emission spectroscopy,N,null earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean reconstruction geoscientificInformation Air Temperature Reconstruction 35850000 cal yr BP 32910000 cal yr BP Complete -67.696167 -67.276167 74.787 75.4045 -475 -412 Continent Antarctica ODP 739>LATITUDE -67.276167>LONGITUDE 75.081833 Continent Antarctica ODP 742>LATITUDE -67.549667>LONGITUDE 75.4045 Continent Antarctica ODP 1166>LATITUDE -67.696167>LONGITUDE 74.787 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 Passchier, S., Ciarletta, D.J., Miriagos, T.E., Bijl, P.K., and Bohaty, S.M. 2017 Geological Society of America Bulletin 129 3-4 318-330 10.1130/B31482.1

Earth’s current icehouse phase began ~34 m.y. ago with the onset of major Antarctic glaciation at the Eocene-Oligocene transition. Changes in ocean circulation and a decline in atmospheric greenhouse gas levels were associated with stepwise cooling and ice growth at southern high latitudes. The Antarctic cryosphere plays a critical role in the ocean-atmosphere system, but its early evolution is still poorly known. With a near-field record from Prydz Bay, Antarctica, we demonstrate that Antarctic ice growth was stepwise and had an earlier onset than previously suggested. Prydz Bay lies downstream of a major East Antarctic Ice Sheet drainage system, and its sedimentary records uniquely constrain the timing of ice-sheet advance onto the continental shelf. We investigated a detrital record extracted from three Ocean Drilling Program drill holes within a new depositional and chronological framework spanning the late Eocene to early Oligocene (ca. 36–33 Ma). The chemical index of alteration (CIA) and the S index, calculated from the major-element geochemistry of bulk samples, yielded estimates of chemical weathering intensities and mean annual temperature on the East Antarctic continent. We document evidence for late Eocene mountain glaciation along with transient warm events at 35.8–34.8 Ma. From 34.4 Ma, associated with the Eocene-Oligocene transition precursor d18O excursion, glaciers advanced into Prydz Bay, coincident with a decline in chemical weathering and temperature. We conclude that Antarctic continental ice growth commenced with the Eocene-Oligocene transition “precursor” glaciation, during a time of Subantarctic surface ocean cooling and a decline in atmospheric pCO2. These results call for dynamic high-latitude feedbacks that are currently poorly represented in Earth system models and emphasize the need for additional near-field glacio-sedimentological, high-latitude sea-surface temperature and pCO2 records across the Eocene-Oligocene transition. STUDY NOTES: ODP Sites 739 (-67.276167 S, 75.081833 E, -412.4 m), 742 (-67.549667 S, 75.4045 E, -415.7 m) and 1166 (-67.696167 S, 74.787 E, -475.4 m) together encompass a composite record; the standard error on the MAT is 3.6 degrees Celsius Provided Keywords: Antarctica, chemical index of alteration, Eocene

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/passchier2017/passchier2017-ODP739_742_1166.xlsm Originally Contributed Excel File; Composite Core Data in Excel GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/passchier2017/passchier2017.txt Formatted Text File; Composite Core Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11