Detection of sediment compaction and disturbance of marine sediments with anisotropy of magnetic susceptibility (AMS)

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Author(s): Sugisaki, S.; Tauxe, L.; van de Flierdt, Tina; Passchier, S.; Jiménez, F.; Williams, Trevor; González, J. J.; Escutia, C.
Author Affiliation(s): Primary:
Scripps Institution of Oceanography, San Diego, CA, United States
Imperial College London, United Kingdom
Montclair State University, United States
Universidad de Granada, Spain
Lamont-Doherty Earth Observatory, United States
Volume Title: AGU 2011 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2011; American Geophysical Union 2011 fall meeting, San Francisco, CA, Dec. 5-9, 2011. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Sites U1356 and U1359 were drilled during IODP Expedition 318 at the Antarctic margin off Wilkes Land. Site U1356 penetrated the regional unconformity expected to reflect the arrival of the first ice sheet on the Wilkes Land continental margin, as well as a number of younger unconformities. Regional unconformities provide important constraints on history and fluctuations of the East Antarctic ice sheet. Site U1359 was drilled to extend the record of Site U1356 throughout the late Cenozoic, in order to reconstruct the stability of the Eastern Antarctic Ice Sheet during Neogene warm periods, such as the late Miocene, the early Pliocene, and Marine Isotope Stages 31 and 11. Besides the sedimentological observations, physical properties, as well as bio- and magnetostratigraphic information place constraints on the unconformaties. In particular, the anisotropy of magnetic susceptibility (AMS) is a very sensitive tool to detect lithological changes and differential compaction, thereby providing additional clues as to the precise location of the hiatuses. Moreover, subtle changes in lithology, for example variations in the percentage of diatoms (which resist compaction) versus silt and clay (which enhances compaction) can be sensitively detected using AMS stratigraphy. We will describe our use of AMS stratigraphy to (1) detect sedimentary coring disturbance (2) constrain the location of Haiti, and (3) characterize variations in compaction between diatom rich and poor layers.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Antarctic ice sheet; Antarctica; Biostratigraphy; Cenozoic; Clastic sediments; Clay; Compaction; Continental margin; Detection; Diatoms; East Antarctic ice sheet; Expedition 318; IODP Site U1356; IODP Site U1359; Integrated Ocean Drilling Program; Magnetic properties; Magnetic susceptibility; Magnetostratigraphy; Marine sediments; Microfossils; Miocene; Neogene; Paleomagnetism; Pliocene; Sediments; Silt; Southern Ocean; Tertiary; Unconformities; Variations; Wilkes Land
Coordinates: S631837 S631837 E1355956 E1355956
S645415 S645415 E1435738 E1435738
Record ID: 2018032645
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