Scanning electron microscopy and rock magnetic studies of magnetic carriers in remagnetized early Paleozoic carbonates from Missouri

Sun Weiwei Sun, M. Jackson

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27 Scopus citations

Abstract

Magnetic carriers in remagnetized early Paleozoic carbonates of the North American midcontinent were studied in extracts and in situ, using rock magnetism and scanning electron microscopy (SEM). SEM observation of extracts and in situ samples shows that the dominant magnetic particles are large irregular grains and framboids (10-20 μm in diameter) and individual spherical and euhedral particles (0.2-1 μm). Comparing the saturation remanence of the bulk rock and extracts indicates that the extracts only account for ~10% of the saturation remanence of the bulk rock. Most of the remanence carriers were lost during the dissolution and separation procedure, especially the finer-grained carriers. The framboids and the individual submicron euhedral magnetic particles observed by SEM thus make a fairly minor contribution to the magnetic remanence of the remagnetized carbonates. Low-temperature experiments support the conclusion that the principal remanence carriers in the remagnetized carbonates are single domain magnetite and that superparamagnetic magnetite plays an important part in the unusual bulk magnetic properties of these rocks. -from Authors

Original languageEnglish (US)
Pages (from-to)2935-2942
Number of pages8
JournalJournal of Geophysical Research
Volume99
Issue numberB2
DOIs
StatePublished - 1994

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