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  • 1
    facet.materialart.
    Unknown
    Sand volcano generated by a violent degassing from methane-saturated aquifers: The case study of Medolla (Modena, Italy) (2018)
    Details
    Publication Date: 2018-03-06
    Description: Sand volcano is an unusual and remarkable geological feature which forms when water-saturated sand deposits are set in motion by liquefaction and are ejected onto the surface. Commonly it is generated during earthquakes, as a result of liquefaction of waterlogged bodies at shallow depth, often causing wide damages. The generation of a sand volcano however can also occur unrelated to a seismic event. On the 10th of October 2014, near Medolla (Italy) during a Cone Penetration Test, a large amount of natural gas (CO2 and CH4) together with a mixture of water and sand were erupted, creating a sand volcano. The study of this event gives the possibility of understanding the dynamics of sand volcano generation, may enable to prevent other anomalies during future CPT tests and, more importantly, underlines the role that natural gas, stored in a sand aquifer, may play in triggering a liquefaction phenomenon. Our results suggest that episodes of gas eruptions require the onset of very peculiar conditions within the reservoir that feeds the emission. The simulations suggest that a geyser discharging a mixture of gas and water, capable of building a sand volcano, requires the presence of a shallow pressurized reservoir (1.2 MPa) where water coexists with a small amount of exsolved gas (a volume fraction of 0.05).The violent degassing occurred in Medolla confirms the role that a free gas phase may have in favoring the mobilization of liquid water and loose deposits, even in the absence of a seismic event.
    Description: Published
    Description: 91-103
    Description: 6A. Geochimica per l'ambiente
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    Enrichment in Heavy Metal (HM) and Rare Earth Element (REE) in Fluvial Placer Deposits: Case Study of Zambesi River (Mozambique) (2018)
    Details
    Publication Date: 2018-03-22
    Description: Mozambique has a huge mineral potential that is largely untapped. Tantalum-niobium, other rare metals, gold and semiprecious stones are abundant. Deposits of heavy mineral sands and a wide range of industrial minerals comprise a few of the mineral wealth in Mozambique that are under development. One of the most interesting zones of Mozambique is definitely the Zambezi River, where the placers deposits are rich in HM and REE. For this reason, ENEA in 2013 has performed an extensive multidisciplinary research along the Lower Zambezi, in cooperation with the Minas Rio Bravo Company (Mozambique). The aim of the research is to verify the REE and heavy metal abundances by measuring geochemical and mineralogical characteristics of the sediments from the bottom of the Zambezi, in the area between Tete and Tambara cities. The analyses were carried out at the Department of Physics and Earth Science of Ferrara University by X-ray fluorescence analysis, X-ray diffraction analysis and pycnometer method. The result of XRD shows that the main minerals are quartz and feldspar. Unfortunately, the XRD peak of the main mineral phases covers up the others. However, chemical analyses reveal high presence of Iron and Titanium oxides and trace elements, as Cesium, Chromium and Lanthanum, suitable for industrial mining purposes. Furthermore, the data of density are comparable to the detecting phases found with XRD. The goal of the survey is to determinate the economic value of the Zambezi sediments for industrial minerals sector. Secondly, the results are important to improve the geochemical and mineralogical knowledge of this zone.
    Description: Published
    Description: 216-221
    Description: 1TR. Studi per le Georisorse
    Description: N/A or not JCR
    Keywords: Zambezi ; REE ; sediments ; mineral industries ; 05.09. Miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Limitation Availability
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    PAPER (OA)
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