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Research Themes in

CHEMICAL AND ISOTOPIC MICRO-ANALYSIS OF MINERALS AND GLASS

 
Partecipants
 
Collaborators
Dr. Ilenia Arienzo, PhD – INGV-OV
Dr. Fabio Carmine Mazzeo, PhD – DiSTAR
Prof. Dr. Gerhard Wörner– GZG, Göttingen, Germania
Dr. Raffaella S. Iovine – GZG, Göttingen, Germania
 
 
 
The mineral phases (as phenocrysts) and groundmass (microcrystalline, hypohyaline, glassy) of volcanic rocks can provide much information on genesis and evolution processes experienced by magmas. By means of the modern micro-analytical techniques it is possible to determine the concentration of major and minor oxides as well as several trace elements, and the isotopic composition of elements such as Sr and Pb, on very small portions of these materials. In particular, isotopic micro-analysis on minerals can allow identification of: i) mantle components involved in the genesis of magmas in different geodynamic settings; ii) components involved in mingling/mixing events among compositionally distinct magmas; iii) crustal contamination processes of magmas rising/stagnating at variable depth. This is possible by analyzing either groups of separated minerals or single phenocrysts, or even through micro-sampling portions of a phenocryst by means of Micromill (Figure; Iovine et al., 2017). Furthermore, high-precision analytical techniques have been recently developed to determine major and minor oxides, and some trace elements through combined wavelength-dispersion/energy dispersion electron microprobe (EMPA-EDS-WDS), integrated with back-scattered electrons images (BSE), on zoned alkali-feldspar and plagioclase phenocrysts, carried out along transects crossing their growth zones. Through high-resolution compositional transects on single phenocrysts, this innovative investigation methodology allows reconstructing the diffusion profile of some key-elements such as Fe, Ti, Mg and Sr along the growth zones. Coupling these profiles and back-scattered electrons images of textural features, it is possible to recognize pre-eruption mixing events occurred during the crystal growth and their number, and identify the mixing end-members through their composition. Moreover, such compositional profiles are the basis to develop diffusion models allowing estimation of the time-scales of residence of the crystals in the magma reservoirs, as well as of the mixing events among distinct magmas.
The research group is currently developing these themes through investigations on samples representative of recent eruptions occurred at Campi Flegrei, in the framework of the biennial Project MIUR-DAAD Joint Mobility Program N. 57266092, titled “Timing of magmatic processes at Campi Flegrei volcanic complex” Responsible: Prof. Massimo D’Antonio).
 
Selected publications
 
Iovine R.S., Fedele L., Mazzeo F.C., Arienzo I., Cavallo A., Wörner G., Orsi G., Civetta L., D’Antonio M. (2017). Timescales of magmatic processes occurred prior to the ~4.7 ka Agnano-Monte Spina eruption (Campi Flegrei caldera, Southern Italy) based on diffusion chronometry on sanidine phenocrysts. Bull. Volcanol., 79, 18, http://dx.doi.org/10.1007/s00445-017-1101-4
 
Arienzo I., Mazzeo F.C., Moretti R., Cavallo A., D’Antonio M. (2016). Open-system magma evolution and fluid transfer at Campi Flegrei caldera (Southern Italy) during the past 5 ka as revealed by geochemical and isotopic data: The example of the Nisida eruption. Chem. Geol., 427, 109-124, http://dx.doi.org/10.1016/j.chemgeo.2016.02.007
 
D’Antonio M., Mariconte R., Arienzo I., Mazzeo F.C., Carandente A., Perugini D., Petrelli M., Corselli C., Orsi G., Principato M.S., Civetta L. (2016). Combined Sr-Nd isotopic and geochemical fingerprinting as a tool for identifying tephra layers: Application to deep-sea cores from Eastern Mediterranean Sea. Chem. Geol., 443, 121-136, http://dx.doi.org/10.1016/j.chemgeo.2016.09.022
 
Arienzo I., D’Antonio M., Di Renzo V., Minolfi G., Tonarini S., Orsi G., Carandente A., Belviso P., Civetta L. (2015). Isotopic microanalysis sheds light on the magmatic endmembers feeding volcanic eruptions: The Astroni 6 case study (Campi Flegrei, Italy). J. Volcanol. Geotherm. Res., 304, 24-37, http://dx.doi.org/10.1016/j.jvolgeores.2015.08.003
 
Arienzo I., Di Renzo V., Minolfi G., Mazzeo F., Carandente A., Belviso P., D’Antonio M., Orsi G., Civetta L. (2014). Sr isotope microanalysis at the Radiogenic Isotope Laboratory of the Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli - Osservatorio Vesuviano. Rapporti Tecnici INGV, 271, pp. 1-17, (http://istituto.ingv.it/l-ingv/produzione-scientifica/rapporti-tecnici-ingv)
 
Giordano F., D’Antonio M., Civetta L., Orsi G., Tonarini S., Ayalew D., Yirgu G., Dell’Erba F., Di Vito M.A., Isaia R. (2014). Genesis and evolution of mafic and felsic magmas at Quaternary volcanoes within the Main Ethiopian Rift: Insights from Gedemsa and Fanta ‘Ale complexes. Lithos, 188, 130-144, http://dx.doi.org/10.1016/j.lithos.2013.08.008
 
Arienzo I., Carandente A., Di Renzo V., Belviso P., Civetta L., D’Antonio M., Orsi G. (2013). Sr and Nd isotope analysis at the Radiogenic Isotope Laboratory of the Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli - Osservatorio Vesuviano. Rapporti Tecnici INGV, 260, pp. 1-18 (http://istituto.ingv.it/l-ingv/produzione-scientifica/rapporti-tecnici-ingv/rapporti-tecnici-2013-2)
 
D’Antonio M., Tonarini S., Arienzo I., Civetta L., Dallai L., Moretti R., Orsi G., Andria M., Trecalli A. (2013). Mantle and crustal processes in the magmatism of the Campania region: inferences from mineralogy, geochemistry, and Sr-Nd-O isotopes of young hybrid volcanics of the Ischia island (south Italy). Contrib. Mineral. Petrol., 165(6), 1173-1194, http://dx.doi.org/10.1007/s00410-013-0853-x
 
Di Renzo V., Arienzo I., Civetta L., D’Antonio M., Tonarini S., Di Vito M.A., Orsi G. (2011). The magmatic feeding system of the Campi Flegrei caldera: architecture and temporal evolution. Chem. Geol., 281, 227-241, http://dx.doi.org/10.1016/j.chemgeo.2010.12.010
 
Di Vito M.A., Arienzo I., Braia G., Civetta L., D’Antonio M., Di Renzo V., Orsi G. (2011). The Averno 2 fissure eruption: a recent small-size explosive event at the Campi Flegrei caldera (Italy). Bull. Volcanol., 73, 295-320, http://dx.doi.org/10.1007/s00445-010-0417-0
 
Tonarini S., D’Antonio M., Di Vito M.A., Orsi G., Carandente A. (2009). Geochemical and B-Sr-Nd isotopic evidence for mingling and mixing processes in the magmatic system that fed the Astroni volcano (4.1-3.8 ka) within the Campi Flegrei caldera (southern Italy). Lithos, 107, 135-151, http://dx.doi.org/10.1016/j.lithos.2008.09.012
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