Evidence of basaltic magma intrusions in a trachytic magma chamber at Pantelleria (Italy)

Silvio Giuseppe Rotolo, Patrizia Landi, Silvio Giuseppe Rotolo

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Abstract

In the last 50 ka basalts have erupted outside the margin of the young caldera on the islandof Pantelleria. The inner portion of the caldera has instead been filled by trachyte lavas,pantellerite lavas and pumice fall deposits. This paper focuses on a low-volume benmoreitelava topping the trachyte lava pile in the middle of the young caldera.The mineral chemistry, including trace elements in clinopyroxene (LA-ICP-MS), suggeststhat benmoreite is a hybrid product resulting from mixing between a trachytic magma and abasaltic end member even more primitive than those erupted during the past 50 ka. Theprincipal inference is that basaltic magmas intruded the trachytic magma chamber below thecaldera and were erupted in recent times within the caldera and not only beyond, as thedistribution of basaltic centers would suggest. Data are used to discuss the relationshipbetween felsic and mafic magmas at Pantelleria.
Lingua originaleEnglish
pagine (da-a)1-16
Numero di pagine16
RivistaPeriodico di Mineralogia
Volume81
Stato di pubblicazionePublished - 2012

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geology
  • Geochemistry and Petrology

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