HR: 0800h
AN: PP41A-0624    [Abstracts]
TI: Geochemical and rock-magnetic analyses of kasten cores from the Joinville-d'Urville Trough, Northeastern Antarctic Peninsula: Results and correlation with the Western Antarctic Peninsula
AU: * Perez, R B
EM: rachelpez@yahoo.com
AF: Department of Earth and Environmental Studies, Montclair State University, 1 Normal Avenue, Montclair, NJ 07043 United States
AU: Brachfeld, S
EM: brachfelds@mail.montclair.edu
AF: Department of Earth and Environmental Studies, Montclair State University, 1 Normal Avenue, Montclair, NJ 07043 United States
AU: Gorring, M
EM: gorringm@mail.montclair.edu
AF: Department of Earth and Environmental Studies, Montclair State University, 1 Normal Avenue, Montclair, NJ 07043 United States
AU: Leventer, A
EM: aleventer@mail.colgate.edu
AF: Department of Geology, Colgate University, 13 Oak Drive, Hamilton, NY 13346 United States
AU: Maritz, J
EM: jmaritz@mail.colgate.edu
AF: Department of Geology, Colgate University, 13 Oak Drive, Hamilton, NY 13346 United States
AU: Domack, E W
EM: edomack@hamilton.edu
AF: Department of Geology, Hamilton College, 198 College Hill Road, Clinton, NY 13323 United States
AU: Ishman, S
EM: sishman@geo.siu.edu
AF: Department of Geology, Southern Illinois University, Mailcode 4324, Carbondale, IL 62901 United States
AU: Gilbert, R
EM: gilbert@lake.geog.queensu.ca
AF: Department of Geography, Queens University, MacIntosh Corry Hall, Kingston, ON K7L 3N6 Canada
AB: Downcore geochemistry of a sedimentary record from the northeast Antarctic Peninsula shows unexpected trends in the drivers of magnetic susceptibility measurements. LMG0404 KC16 was recovered from a sediment drift within the Joinville-d'Urville Trough on the northeastern Antarctic Peninsula. This core shows a two-part magnetic susceptibility profile: the upper 170-cm shows regularly-spaced highs and lows, followed by a large amplitude drop. The susceptibility profile of KC16 is similar to those found on the western side of the Antarctic Peninsula. The focus of this study is to determine whether the same processes drive magnetic susceptibility on both sides of the Antarctic Peninsula. Major and minor elemental abundances were determined using ICP-OES analysis. Surprisingly, susceptibility is not correlated with Si and is inversely correlated with Fe. Similarly there is no correlation between susceptibility and diatom abundance, suggesting that productivity is not an important control on susceptibility in KC16. However, there is a weak positive correlation between % benthic diatoms and susceptibility peaks. Susceptibility is positively correlated with Ca, Al, Mn, Ti, and Mg. Work in progress includes Curie temperature analysis to identify magnetic mineralogy, hysteresis measurements to determine magnetic grain size, and lead-210 dating.
DE: 1051 Sedimentary geochemistry
DE: 1065 Major and trace element geochemistry
DE: 1512 Environmental magnetism
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 3022 Marine sediments: processes and transport
SC: Paleoceanography and Paleoclimatology [PP]
MN: Fall Meeting 2005