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@InProceedings{RiesselmanBESMMRSSVSZLWZ:2019:InReIO,
               author = "Riesselman, Christina R. and Bromcacher, Anieke and Esper, Oliver 
                         and Souza, Alexandre and Malinverno, Elisa and Middleton, Jennifer 
                         L. and Ravelo, Ana Christina and Saavedra, Mariem and Singh, Raj 
                         K. and Venancio, Igor Martins and Stoner, Joseph Stephen and Zhao, 
                         Xiangyu and Lamy, Frank and Winckler, Gisela and Zarikian, Carlos 
                         A. Alvarez",
          affiliation = "{University of Otago} and {National Oceanographic Centre} and 
                         Alfred Wegener Institute, Helmholtz Center for Polar and Marine 
                         Research (AWI) and {Universidade Federal Fluminense (UFF)} and 
                         {University of Milano-Bicocca} and {Lamont Doherty Earth 
                         Observatory} and {University of California-Santa Cruz} and 
                         {University of Birmingham} and {Indian Institute of Technology 
                         Bhubaneshwar} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Oregon State University} and {NIPR National Institute 
                         of Polar Research} and {AWI Bremerhaven} and {Columbia University} 
                         and {Integrated Ocean Drilling Program}",
                title = "Magneto-biostratigraphic integration of Neogene sequences from the 
                         subantarctic Pacific Ocean: Initial results from IODP Exp. 383",
                 year = "2019",
         organization = "AGU Fall Meeting",
             abstract = "Excellent chronostratigraphic control is essential for the 
                         development and comparison of paleoceanographic reconstructions 
                         across key climate transitions of the Neogene. However, the 
                         calibration of Miocene and Pliocene biostratigraphic datums in the 
                         Southern Ocean has historically been hampered by the presence of 
                         hiatuses in many existing records and the limited distribution of 
                         sediment cores with suitable lithologies to support the 
                         development of high-fidelity magnetostratigraphies. From May-July, 
                         2019, IODP Exp. 383 collected sediment cores from four pelagic and 
                         hemipelagic sites comprising a zonal transect along the northern 
                         flank of the Pacific Antarctic Circumpolar Current, from 76°41 W 
                         to 125°26 W. Diatoms, radiolarians, calcareous nannofossils, and 
                         planktonic foraminifers provide excellent primary biostratigraphic 
                         control for these four sites (U1539, U1540, U1541, and U1543), all 
                         of which record continuous accumulation. The oldest, central South 
                         Pacific Site U1541 (54°13 S, ~3600 m water depth), spans >8.2 Myr, 
                         constrained by 74 biostratigraphic events, anchored by 27 
                         well-defined polarity reversals observed within cores. Eastern 
                         South Pacific Site U1543, situated on an elevated ridge west of 
                         the Chile Trench (54°35 S, ~3860 m water depth) spans >7.2 Myr and 
                         is constrained by 54 biostratigraphic events, anchored by 29 
                         well-defined polarity reversals observed within cores. While 
                         shipboard biostratigraphic age assignments from all sites are 
                         generally in good agreement with the paleomagnetic reversal 
                         stratigraphy throughout the Pleistocene, systematic offsets and 
                         increasing age uncertainties were identified in the Pliocene and 
                         Miocene. Here, we use the exceptional shipboard paleomagnetic 
                         records from U1541 and U1543 to recalibrate select 
                         biostratigraphic datums, a first step towards providing a new 
                         Southern Ocean reference section for key intervals of the geologic 
                         timescale.",
  conference-location = "San Francisco, CA",
      conference-year = "09-13 dec.",
             language = "en",
           targetfile = "riesselman_magneto.pdf",
        urlaccessdate = "29 mar. 2024"
}


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