Magma chamber evolution under the Phlegraean Fields during the last 10 ka: trace element and isotop data
Civetta, Lucia; Carluccio, E.; Innocenti, Fabrizio; Sbrana, A.; Taddeucci, G.
European Journal of Mineralogy Volume 3 Number 2 (1991), p. 415 - 428
published: Apr 18, 1991
manuscript accepted: Nov 5, 1990
manuscript received: Mar 12, 1990
ArtNo. ESP147050302012, Price: 29.00 €
Abstract During the past 10 ka, the products of volcanic activity in the Phlegraean Fields have exhibited a compositional variation from trachybasalt to peralkaline phonohte, which is interpreted as resulting from differentiation dominated by crystal-liquid fractionation in a shallow magma chamber. Whole-rock 87Sr/86Sr data show a regular trend with the less differentiated rocks having the most radiogenic Sr. There is no systematic variation in Neodymium isotopes. The isotopic variations are considered to be the result of a pre-eruptive process in the magma chamber, which was affected in its deeper part by a combined process of crystal fractionation and fluid-magma interaction.