Mathematics – Logic
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..453t&link_type=abstract
Nature, Volume 318, Issue 6045, pp. 453-455 (1985).
Mathematics
Logic
17
Scientific paper
The variation of geomagnetic field direction in Sicily during the past 700 yr has tentatively been determined using lavas of known date from Mount Etna1. Additional palaeomagnetic studies on several hundred volcanic samples, combined with archaeomagnetic investigations carried out on Norman buildings, have improved the previous results and permit a reconstruction of the geomagnetic variation curve to about AD 1000. This curve agrees well with those obtained for other European countries2-6 and may be used as a reference for checking the ages attributed to archaeological structures as well as volcanic products in southern Italy during the past 1,000 yr. The present results cast serious doubts on the true ages of numerous historically dated lavas from Mount Etna, most of which are at least several centuries older than previously believed. The conclusions have implications for the succession of eruptions, effusion rates, magmatic evolution, and so on, and demonstrate the inconsistency of eruptive models based on historical records alone.
Bucur Ileana
Tanguy Jean-Claude
Thompson F. C. J.
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