PUMA
Istituto di Geoscienze e Georisorse     
Bigazzi G., Bonadonna F. P., Ghezzo C., Giuliani O., Radicati Di Brozolo F., Rita F. Geochronological study of Monte Amiata Lavas (Central Italy). In: Bulletin of Volcanology, vol. 44 (3) pp. 455 - 465. Springer, 1981.
 
 
Abstract
(English)
K/Ar and fission track age measurements were performed on lava samples of Monte Amiata volcano (Central Italy) which is formed by a sequence of lava flows and lava domes ranging in composition from trachybasalts to high-SiO₂ quartzlatites. The ages obtained, except for the oldest volcanic products, range from 290,000 to 180,000 years. Excess ⁴⁰Ar was found in some mineral separates, especially biotite, causing apparent rather old ages. The correct ages were calculated by means of K/Ar isochrons, and were found to be very similar to the ages calculated on sanidine separates. The volcanic activity that built up the outcropping Monte Amiata units seems to have lasted a relatively short time.
URL: http://www.springerlink.com/content/gn814756kw728677/
DOI: 10.1007/BF02600577
Subject Italy
Monte Amiata volcano
rock chemical analyses
geochronology
fission track dating
K-Ar dating


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