We present here petrological andgeochemical data on volcanics cropping out insouthern and northeastern walls of the Valle delBove (Mt. Etna), belonging to the Rocche, SerraGiannicola Grande and Canalone della MontagnolaUnits. These units constitute the remnants of severalvolcanoes that were active in the time span 102-80ka, i.e. before the growth of the Ellittico-Mongibellostrato-volcano. Their products, range in compositionfrom hawaiites to benmoreites. Amphibole(kaersutite) is present as phenocryst in all the studiedrocks, and commonly shows breakdown coronasof rhönite ± clinopyroxene and plagioclase formedduring magma ascent. Nevertheless, in mafic rocks,amphibole occurs as an early liquidus phase enclosedin a Ca-rich plagioclase (up to An87). We propose thatearly cotectic crystallization of amphibole and Caplagioclasemay reflect H2O-rich melts. Variations inmajor and trace elements among lavas erupted fromcoeval centres, suggest that fractional crystallizationwas the principal evolutionary process but at the sametime magmas feeding the various volcanoes belongingto the Rocche Unit were more heterogeneous withrespect to the younger Units studied here.
|Numero di pagine||16|
|Rivista||Periodico di Mineralogia|
|Stato di pubblicazione||Published - 2006|
All Science Journal Classification (ASJC) codes
- Geochemistry and Petrology