Geochemical study of the Solchiaro (Procida Island,Campi Flegrei) eruptive products by microthermometry and microanalyses of fluid and melt inclusions.

Esposito, Rosario (2009) Geochemical study of the Solchiaro (Procida Island,Campi Flegrei) eruptive products by microthermometry and microanalyses of fluid and melt inclusions. [Tesi di dottorato] (Inedito)

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Abstract

This study presents the work I have done during the 4 years of a PhD program that was part of the internationalization programme of the Italian research system approved by the Ministero della Ricerca e dell’Università (MIUR) between the Università degli Studi di Napoli “Federico II”, (Dipartimento di Scinze della Terra) and the Virginia Polytechnic Institute and State University (Department of Geosciences). 107 selected melt inclusion (MI), 77 open glasses, 80 olivines and 7 bulk rocks (from 4 representative samples of Solchiaro eruption) were analyzed for major/trace element and volatiles. Mostly, olivine compositions vary from Fo82 to Fo88 with one maximum value of Fo90. 2 group of MI were recognized based on major element composition: 1) K2O-rich MI with composition that is the same of bulk rock in the literature and 2) K2O-poor MI that instead have been never reported from previous study of the Phlegrean Volcanic District (PVD). The first group consists of 95% of the melt and relates mostly to within plate setting whereas the second group consists of around 5% of the melt and relates to subduction setting. Magma associated with Solchiaro eruption evolved under open system processes as suggested by petrographic evidence and glass compositions. H2O-CO2 concentrations dissolved in glass suggest that magma was saturated in volatiles at least at 12.5 km depth and continuously degassed during the Solchiaro eruption. Maximum depths are in agreement with other studies based on different approaches. Volatile correlations suggest that during closed system degassing, as the Solchiaro eruption progressed, maximum S contents decreased and minimum Cl and F contents increased. The major, trace and volatile evolution of crystals, glass, and MI is consistent with a model that involves either continuous or episodic recharge of the magma chamber ponded at least at 12.5 km depth.

Tipologia di documento:Tesi di dottorato
Parole chiave:melt inclusion, volatiles, Solchiaro eruption
Settori scientifico-disciplinari MIUR:Area 04 Scienze della terra > GEO/08 GEOCHIMICA E VULCANOLOGIA
Coordinatori della Scuola di dottorato:
Coordinatore del Corso di dottoratoe-mail (se nota)
Mazzoli, Stefano
Tutor della Scuola di dottorato:
Tutor del Corso di dottoratoe-mail (se nota)
De Vivo, Benedettobdevivo@unina.it
Bodnar, Robert J.rjb@vt.edu
Stato del full text:Accessibile
Data:29 Novembre 2009
Numero di pagine:73
Istituzione:Università degli studi di Napoli Fedirico II
Dipartimento o Struttura:Scienze della Terra
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Scuola di dottorato:Geochimica e Vulcanologia
Denominazione del dottorato:Dinamica interna di sistemi magmatici di vulcani attivi
Ciclo di dottorato:XXI
Numero di sistema:4211
Depositato il:01 Dicembre 2009 15:15
Ultima modifica:13 Luglio 2012 11:20

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