MULTIVARIATE STATISTICAL TOOLS FOR THE RADIOMETRIC FEATURES OF VOLCANIC ISLANDS

Risultato della ricerca: Conference contribution

Abstract

The Aeolian Islands represents a Quaternary volcanic arc related to the subduction of the Ionianplate beneath the Calabrian Arc. The geochemical variability of the islands has led to a broadspectrum of magma rocks. Volcanic products from calc-alkaline (CA) to calc-alkaline high inpotassium (HKCA) are present throughout the Archipelago, but products belonging to shoshonitic(SHO) and potassium (KS) series characterize the southern portion of Lipari, Vulcano and Stromboli.Tectonics also plays an important role in the process of the islands differentiation.In this work, we want to review and cross-analyze the data on Lipari, Stromboli and Vulcano,collected in measurement and sampling campaigns over the last years. Chemical data were obtainedby X-ray fluorescence. High resolution gamma-ray spectrometry with germanium detectorswas used to measure primordial radionuclide activities. The activity of primordial radionuclides inthe volcanic products of these three islands is strongly dependent on their chemism. The highestcontents are found in more differentiated products (rhyolites). The CA products have lower concentrations,while the HKCA and Shoshonitic product concentrations are in between. Calculateddose rates have been correlated with the petrochemical features in order to gain further insight inevolution and differentiation of volcanic products. Ratio matching technique and multivariate statisticalanalyses, such as Principal Component Analysis and Minimum Spanning Tree, have beenapplied as an additional tool helpful to better describe the lithological affinities of the samples.
Lingua originaleEnglish
Titolo della pubblicazione ospiteVI INTERNATIONAL SYMPOSIUM ON NUCLEAR & RELATED TECHNIQUES CONFERENCE RECORD XII WORKSHOP ON NUCLEAR PHYSICS
Numero di pagine12
Stato di pubblicazionePublished - 2009

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