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Paleomagnetic Analysis Using SQUID MicroscopySuperconducting quantum interference device (SQUID) microscopes are a new generation of instruments that map magnetic fields with unprecedented spatial resolution and moment sensitivity. Unlike standard rock magnetometers, SQUID microscopes map magnetic fields rather than measuring magnetic moments such that the sample magnetization pattern must be retrieved from source model fits to the measured field data. In this paper, we presented the first direct comparison between paleomagnetic analyses on natural samples using joint measurements from SQUID microscopy and moment magnetometry. We demonstrated that in combination with apriori geologic and petrographic data, SQUID microscopy can accurately characterize the magnetization of lunar glass spherules and Hawaiian basalt. The bulk moment magnitude and direction of these samples inferred from inversions of SQUID microscopy data match direct measurements on the same samples using moment magnetometry. In addition, these inversions provide unique constraints on the magnetization distribution within the sample. These measurements are among the most sensitive and highest resolution quantitative paleomagnetic studies of natural remanent magnetization to date. We expect that this technique will be able to extend many other standard paleomagnetic techniques to previously inaccessible microscale samples.
Document ID
20070034987
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Weiss, Benjamin P. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Lima, Eduardo A. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Fong, Luis E. (Vanderbilt Univ. Nashville, TN, United States)
Baudenbacher, Franz J. (Vanderbilt Univ. Nashville, TN, United States)
Date Acquired
August 24, 2013
Publication Date
September 19, 2007
Publication Information
Publication: Journal of Geophysical Research
Volume: 112
Subject Category
Lunar and Planetary Science and Exploration
Funding Number(s)
CONTRACT_GRANT: NNX06AD14G
Distribution Limits
Public
Copyright
Other