Dissertation/Thesis Abstract

Paleomagnetic Analysis of Quaternary Sediments from Baffin Bay, Western Greenland
by Jensen, Sean Ross, M.S., University of Louisiana at Lafayette, 2018, 56; 10812544
Abstract (Summary)

Quaternary, high-resolution paleomagnetic, and rock magnetic results obtained by the Baffin Bay Scientific Coring Program, Integrated Ocean Drilling Program Expedition 344S, were analyzed from 12 core sites at an average water depth of 394 m: Sites U0021A, U0047A, U0060A, U0061A, U0070A, U0080A, U0082A, U0083A, U0100A, U0110A, U0110B, and U0110C. The detailed rock magnetic analyses obtained in this study help to further explore the geomagnetic field within the Arctic basin, which is poorly understood because of chronostratigraphic limitations. 1,078 split-core and 58 discrete rock-magnetic measurements were obtained at 5-cm increments along 32 split-core sections, in addition to eight u-channel samples measured at 1-cm increments at Sites U0021, U0047, U0060, and U0061. Ultimately, u-channel data provide more detailed information than split core data because they avoid disturbances that can occur on the side of the core liner and can be measured at much higher resolution. Stepwise alternating field demagnetization of the natural remanent magnetism and subsequent principal component analysis yielded high-quality, stable characteristic remanent magnetism directions. The magnetic inclination fluctuates close to the expected geocentric axial dipole at ~80°. Sites U0021, U0047, U0060, and U0061 all exhibit at least one magnetic reversal, which is especially well displayed in the u-channel data. Site U0021 contains a potential second and third polarity reversal exhibited by the u-channel data. Based on past paleomagnetic studies and proposed sedimentation rates in the Arctic, these excursions are likely to be in the late Brunhes Chron. Analyzing past paleomagnetic stacks along with the u-channel data from Integrated Ocean Drilling Program Expedition 344S, it is possible to realize the age of past excursions. Ultimately, the Laschamp excursion (~40 ka) and the Norwegian Greenland Sea Event (~61 ka) were likely detected in the u-channel data.

Indexing (document details)
Advisor: Richter, Carl
Commitee: Duex, Timothy, Lock, Brian E.
School: University of Louisiana at Lafayette
Department: Geology
School Location: United States -- Louisiana
Source: MAI 58/05M(E), Masters Abstracts International
Subjects: Geology, European Studies
Keywords: Baffin Bay, Paleomagnetism
Publication Number: 10812544
ISBN: 978-1-392-04120-8
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