Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..781j&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 8, April 24, 1992, p. 781-784. Research supported by Keck Foundation
Physics
13
Carbonates, Continents, Magnetic Signatures, Magnetization, Paleomagnetism, Paleozoic Era, Magnetic Permeability, Magnetite, North America, Remanence
Scientific paper
Results of a paleomagnetic and rock magnetic survey of Paleozoic carbonates from 39 sites in the midcontinental U.S. show that many of these sites carry a stable remanence of apparent Permian age. Many of these remagnetized sites also have relatively high anhysteretic susceptibilities, and higher saturation remanence than most of the sites where the Late Paleozoic remanence is absent. The most diagnostic rock magnetic parameter for recognizing remagnetized sites is a ratio of anhysteretic remanence/saturation remanence exceeding 10 percent. High ratios were found in almost all remagnetized sites, but in very few sites where the Late Paleozoic remanence is absent. The high ratios reflect the presence of a significant fraction of extremely fine-grained magnetite (a few tens of nanometers), spanning the superparamagnetic-single domain threshold.
Craddock John P.
Jackson Mike
Sun Wei-Wei
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