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Morelli, G.
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- PublicationRestrictedInsights into mantle-type volatiles contribution from dissolved gases in artesian waters of the Great Artesian Basin, Australia(2014-04)
; ; ; ; ; ;Italiano, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia ;Yuce, G.; Hacettepe University, Department of Geological Engineering, Beytepe, Ankara, Turkey ;Uysal, I. T.; The Queensland Geothermal Energy Centre of Excellence, The University of Queensland, QLD, Australia ;Gasparon, M.; School of Earth Sciences, The University of Queensland, QLD, Australia ;Morelli, G.; Australian National Centre for Groundwater Research and Training, Australia; ; ; ; The geochemical features of the volatiles dissolved in artesian thermal waters discharged over three basins (Millungera, Galilee and Cooper basin) of the Australian Great Artesian Basin (GAB) consistently indicate the presence of fluids from multiple gas sources located in the crust (e.g. sediments, oil reservoirs, granites) as well as minor but detectable contributions of mantle/magma-derived fluids. The gases extracted from 19 water samples and analyzed for their chemical and isotopic composition exhibit amounts of CO2 up to about 340 mlSTP/LH2O marked by a δ13CTDC (Total Dissolved Carbon) ranging from −16.9 to +0.18‰ vs PDB, while CH4 concentrations vary from 4.4 × 10−5 to 4.9 mlSTP/LH2O. Helium contents were between 9 and N2800 times higher than equilibrium with Air Saturated Water (ASW), with a maximum value of 0.12 mlSTP/LH2O. Helium isotopic composition was in the 0.02–0.21 Ra range (Ra = air-normalized 3He/4He ratio). The three investigated basins differ from each other in terms of both chemical composition and isotopic signatures of the dissolved gases whose origin is attributed to both mantle and crustal volatiles. Mantle He is present in the west-central and hottest part of the GAB despite no evidence of recent volcanism.Wefound that the partial pressure of helium, significantly higher in crustal fluids than in mantle-type volatiles, enhances the crustal He signature in the dissolved gases, thus masking the original mantle contribution. Neotectonic activity involving deep lithospheric structures and magma intrusions, highlighted by recent geophysical investigations, is considered to be the drivers of mantle/magmatic volatiles towards the surface. The results, although pertaining to artesian waters froma vast area of N542,000 km2, provide newconstraints on volatile injection, and showthat fluids' geochemistry can provide additional and independent information on the geo-tectonic settings of the Great Artesian Basin and its geothermal potential.323 65 - PublicationRestrictedA Multi-Methodological Approach for Archaeology(2013-11-24)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;The comparison between so many studies groups will cause a quite long temperai development, but fmally it will allow to obtain a twofold goal: first to bring to light Pope Alexander IV tomb and then, more importantly from thè scientifìc point of view, put compared, in a single site, 9 geophysical different methods, non-invasive and non-destructive and 15 different instruments, therefore the data will be very important in various fields, historical, archaeological, geological and architecrural. The techniques compared in thè "research project of Pope Alexander IV tomb" will be: Ground Penetrating Radar (GPR), IDEM - Method in Time Domain Electromagnetic (EM61 - Metal Detector High Resolution), EM31 (FDEM) Electromagnetic Method in thè frequency domain, Electrical Tomography (ERT), Microgravimetric Method, Sonic Tests, Survey Seismic Tomography, Magnetometric Methods.The first results are beginning to emerge and by analyzing the methodologies separately and comparing the results obtained with the different techniques.122 12 - PublicationRestrictedA structural and geophysical approach to the study of fractured aquifers in the Scansano-Magliano in Toscana Ridge, southern Tuscany, Italy(2009-07)
; ; ; ; ; ; ; ; ; ;Francese, R.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy ;Mazzarini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Bistacchi, A.; Dipartimento di Geologia e Geotecnologia, Università di Milano Bicocca, Milano, Italy ;Morelli, G.; Geostudi Astier S.r.l., Livorno, Italy ;Pasquarè, G.; Dipartimento di Geologia, Università di Milano, Milano, Italy ;Praticelli, N.; Dipartimento di Geoscienze, Università di Padova, Padova, Italy ;Robain, H.; Institute de Recherche pour le Développement, Bondy Cedex, France ;Wardell, N.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy ;Zaja, A.; Dipartimento di Geoscienze, Università di Padova, Padova, Italy; ; ; ; ; ; ; ; Fresh water availability has recently become a serious concern in the Italian Apennines, as various activities rely on a predictable supply. Along the ridge between Scansano and Magliano in Toscana, in southern Tuscany, the situation is further complicated by contamination of the nearby alluvial aquifers. Aquifers locally consist of thin fractured reservoirs, generally within low-permeability formations, and it can be difficult to plan the exploitation of resources based on conventional techniques. An integrated study based on geological data investigated the link between tectonics and groundwater circulation, to better define the hydrological model. After the regional identification of fault and fracture patterns, a major structure was investigated in detail to accurately map its spatial position and to understand the geometry and properties of the associated aquifer and assess its exploitation potential. The subsurface around the fault zone was clearly imaged using ground probing radar, two-dimensional and three-dimensional resistivity tomography, and three-dimensional shallow seismic surveys. The vertical and horizontal contacts between the different geological units of the Ligurian and Tuscan series were resolved with a high degree of spatial accuracy. Three-dimensional high-resolution geophysical imaging proved to be a very effective means of characterising small-scale fractured reservoirs.217 23