Magnetic study of a recent levee in the Bengal Fan (8°N, IODP Site U1454)

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Author(s): Meynadier, Laure; Savian, Jairo F.; Selkin, Peter A.; Reilly, Brendan T.; Lantzsch, Hendrik; Saur, Hugo; Galy, Albert; France-Lanord, Christian; Spiess, Volkhard; Klaus, Adam
Author Affiliation(s): Primary:
Institut de Physique du Globe de Paris, Paris, France
Institute of Astronomy, Geophysics and Atmospheric Sciences, Brazil
University of Washington Tacoma, United States
Oregon State University, United States
University of Bremen, Germany
Centre de Recherches Pétrographiques et Géochimiques, France
Texas A&M University, United States
Volume Title: AGU 2016 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2016; American Geophysical Union 2016 fall meeting, San Francisco, CA, Dec. 12-16, 2016. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: A scientific objective of Expedition IODP 354 that drilled a 7-site transect at 8°N during Spring 2015 in the Bay of Bengal was to investigate the fan architecture and the migration of the active channel trough time. Site U1454 is located at the West of the transect, nearby the Holocene active channel and recovered the most recent levee deposits. We present a magnetic study of the upper 30 meters of the two adjacent B and C holes. Both holes were correlated by means of Grape and susceptibility measurements that were performed on board and subsequently measured on U-channels. They provide a continuous sequence. Mean deposition rate is expected to be on the order of 1m/ka. U-channels taken from both holes were stepwise demagnetized at small increments and ARM acquisition and demagnetization performed at the same steps. Based on previous work (Tanty et al. G3, 2016) dealing with magnetic analysis of turbidites we rely on a few magnetic parameters, especially the inclination and the magnetic grains size patterns, to decipher the succession of the turbiditic episodes present in the sequence. These parameters are coupled with sedimentary indicators derived from high-resolution measurements.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 07 Marine Geology and Oceanography; Bay of Bengal; Bengal Fan; Expedition 354; IODP Site U1454; Indian Ocean; International Ocean Discovery Program; Magnetic properties; Marine sediments; Sediments
Coordinates: N080024 N080024 E0855100 E0855059
Record ID: 2017068167
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