Intensity history of the earth's magnetic field during the late quaternary as recorded by the sidements of the Blake/Bahama outer ridge, north Atlantic Ocean ...

• Main Author: Schwartz, Martha author
• Format: Thesis
• Language: English
• Published: University of Southern California Digital Library (USC.DL) 2020
• Subjects: Geological Sciences degree program; Doctor of Philosophy degree; Graduate School school; North Atlantic
• Online Access: https://dx.doi.org/10.25549/usctheses-c89-411899; https://digitallibrary.usc.edu/asset-management/2A3BF1WZIL5Z

The purpose of this work is threefold. One major goal is to calibrate, as well as possible, the methodology needed to extract accurate records of past geomagnetic field intensity from rapidly deposited sediments. A second goal is to examine the extent to which chemical changes subsequent to deposition may alter paleointensity estimates. The third is to present and evaluate a number of such paleointensity records for the last seventy thousand years of earth's history. ? This dissertation is a compendium of six manuscripts, which are in various stages of publication at this time. All of them deal with the general topic of paleomagnetic field intensity determinations from rapidly deposited sediments. In the broadest terms, the goal is to normalize the natural remanent magnetization (NRM) in the sediment by some measure of the varying amount of magnetic material variously available for alignment in the Earth's field. The problem is complex ...