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Post-emplacement minerogenetic processes in Upper Tufo Giallo della Via Tiberina (Latium): a mineralogical and volcanological approach

Rapisardo, Gianmarco (2013) Post-emplacement minerogenetic processes in Upper Tufo Giallo della Via Tiberina (Latium): a mineralogical and volcanological approach. Doctoral Thesis.

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Abstract

The present research deal with volcanological and mineralogical features of a widespread pyroclastic formation from Sabatini Volcanic district: Upper Tufo Giallo della Via Tiberina (UTGVT). Volcanological and mineralogical aspects allow the reconstruction of minerogenetic processes that affects the three flow sub-units (a, b, c) of this formation. Volcanological data allow to ascribe the UTGVT formation to an emplacement mechanism belonging to pyroclastic flow. Field evidence suggests a water-magma interaction in pre-eruptive conditions. The emplacement temperature and the presence of abundant fluid phase, favoured the crystallization of zeolites. Chabazite is the main zeolite followed by phillipsite, in a and b sub-units, suggesting a calcic-potassic environment inside the system. The Ca-rich environment is confirmed by the occurrence of secondary calcite, spread inside the rock. Wherever deposit preserves high temperature for a long time, zeolites evolves toward a more stable phase (authigenic feldspars, adularia-like). Analcime is the main zeolite in the c sub-unit; its origin is due to the alteration of primary leucite. The lithification process of UTGVT formation is due to the occurrence of a double cement; which is made up of zeolites and secondary calcite. Crystallization of authigenic minerals (zeolites, feldspars) and the occurrence of calcite progressively enhances the physical properties of deposit.

Item Type:Doctoral Thesis
ID Code:8248
Contributors:Cappelletti, Piergiulio and Petrosino, Paola
Publisher:Università degli studi di Sassari
Uncontrolled Keywords:Minerogenesis, zeolites, mineralogical and volcanological aspect
Subjects:Area 04 - Scienze della terra > GEO/09 Georisorse minerarie e applicazioni mineralogico- petrografiche per l'ambiente ed i beni culturali
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Cicli, scuole e corsi:Ciclo 25 > Scuole > Scienze della natura e delle sue risorse > Scienza e tecnologia dei minerali e delle rocce di interesse industriale
Deposited On:03 Apr 2013 17:33

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