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High resolution magnetic susceptibility imaging of geological thin sections: Pilot study of a pyroclastic sample from the Bishop Tuff, California, U.S.A.
Author(s) -
Thomas I. M.,
Moyer T. C.,
Wikswo J. P.
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl02322
Subject(s) - pyroclastic rock , rock magnetism , geology , magnetic susceptibility , remanence , anisotropy , mineralogy , phenocryst , magnetism , high resolution , deposition (geology) , magnetization , geochemistry , geomorphology , volcanic rock , volcano , magnetic field , condensed matter physics , optics , remote sensing , physics , sediment , quantum mechanics
High resolution magnetic susceptibility imaging is a new technique for studying the magnetic properties of geological thin sections. The two‐dimensional distribution of both remanent and induced magnetization can be determined with a spatial resolution (< 1.0 mm) that is similar to the size of phenocrysts in the sample. Amongst many problems in rock magnetism to which it could be applied, the technique holds great potential for understanding the origin of the anisotropy of magnetic susceptibility in pyroclastic flows. Preliminary tests on a single sample of ignimbrite indicate that secondary iron‐titanium oxide particles deposited within vesicle walls prior to their collapse are responsible for the bulk susceptibility.