Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..835v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 9, p. 835-838.
Physics
1
Geomagnetism, Magnetic Field Inversions, Magnetization, Paleomagnetism, Remanence, Sedimentary Rocks, Declination, Demagnetization, Inclination, Magnetite, Sicily
Scientific paper
A detailed paleomagnetic record-of the Gilbert/Gauss reversed boundary in deep sea marls from southern Sicily shows that the remanence characterizing the reversal is carried by a high temperature magnetite component. A low-temperature component, is intermediate between the high temperature component and a present-day overprint, suggesting that it is obscured by weathering. The actual reversal record is clearly affected by filtering caused by early diagenetic acquisition of a chemical remanent magnetization (CRM). Intermediate VGPs show a general confinement to a longitude over the Americas. More specifically, they are restricted to two clusters, a less distinct one off SE South America, and a very prominent one near NE North America. The remarkable coincidence with two 'Hoffmann clusters' suggests that even a CRM acquisition later cannot entirely obscure long-lived transitional features.
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