Paleomagnetism of Pleistocene volcanic rocks from Pantelleria Island (Sicily Channel), Italy

Details Paleomagnetism of Pleistocene volcanic rocks from Pantelleria Island (Sicily Channel), Italy Paleomagnetism of Pleistocene volcanic rocks from Pantelleria Island (Sicily Channel), Italy

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pepi..108..291z&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 108, Issue 4, p. 291-303.

Physics

7

Scientific paper

A paleomagnetic investigation has been carried out on Pleistocene volcanic rocks from Pantelleria, in the Sicily Channel. This island is characterised by a bimodal volcanism of peralkaline rhyolite to trachyte and basalt composition. The radiometric data indicate that volcanic activity started around 324 ka BP. Samples have been collected from 30 sites in 16 volcanic units spanning activity during the last 150 ka. Magnetic properties vary systematically with lithotype and indicate high-Ti titanomagnetite to magnetite as the main carriers of magnetisation. Stable characteristic remanent magnetisation (ChRM) directions isolated by alternating fields (Af) demagnetisation show normal polarity consistent with emplacement during the Brunhes chron and vary within the paleosecular variation (PSV) range. However, the inclinations are low as compared with the geocentric axial dipole (GAD) inclination at Pantelleria, especially for volcanic units younger than 50 ka. The mean ChRM direction computed from 27 sites is D=358.8°, I=46.9° (k=30, α95=5.2°), and the inclination anomaly is ΔI=-8.1°. Both tectonic movements and the presence of large magnetic anomalies around the island of Pantelleria fail to explain this low inclination, which may therefore be related to a significant long-lived, non-dipolar field contribution in the area over the past 150 kyr.

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