@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"
}