Other
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..247l&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 4, p. 247-258
Other
10
Italy, Magnetic Anomalies, Magnetite, Polarity, Remanence, Stratigraphy, Vector Analysis, Geomagnetism, Mineralogy
Scientific paper
The marine magnetic polarity record shows many small-scale anomalies that could be due to short normal polarity subchrons within chrons 12R and 13R. New examination of published magnetostratigraphic results from a section near Gubbio shows that suspected short chrons in this section are probably not real. The Eocene-Oligocene boundary in the stratotype section at Massignano lies just above a tentatively identified normal magnetozone that might correlate with a possible short normal subchron within chron 13R. In a new investigation of the weathered marlstones in this section, acquisition and thermal demagnetization of isothermal remanent magnetization (IRM) reveal a magnetic mineralogy dominated by magnetite, within minor amounts of maghemite and hematite. Vector analysis of the natural remanent magnetization discloses a complex structure in some samples: at least two and up to four components were isolated. The magnetostratigraphy based on a magnetite component correlates well to the main features of the chron 13N - 16N polarity sequence. No short polarity subchrons are found, although the resolution is inadequate to exclude the possibility that they exist. In particular, we did not find a short normal polarity magnetozone previously located close to the Eocene-Oligocene boundary. The results of this study favor the interpretation that low-amplitude magnetic anomalies represent geomagnetic intensity fluctuations rather than unresolved short polarity intervals.
Lanci Luca
Lowrie William
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