Petrology of some amphibole-bearing volcanics of the pre-ellittico period (102-80 ka) Mt. Etna

Silvio Giuseppe Rotolo, Massimo Pompilio, Manuela Lopez

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Abstract

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.
Lingua originaleEnglish
pagine (da-a)151-166
Numero di pagine16
RivistaPeriodico di Mineralogia
Volume75 /2-3
Stato di pubblicazionePublished - 2006

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geology
  • Geochemistry and Petrology

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