196,073 research outputs found
Bauxite in Abruzzi (Italy): the Campo Felice and Monte Orsello occurrences
No full textBauxite deposits were largely exploited in Italy at the beginning of the twentieth century up to the 2nd World War. The most productive districts were located in the Apulia, Campania and Abruzzi region. The Abruzzi bauxite district comprises several deposits, which are currently uneconomic, at Campo Felice, Monte Orsello and in the Ocre Mts. (Apennine chain). Two main bauxite horizons occur: a first corresponding to a Late Albian-Early Cenomanian stratigraphic gap, and a second bounded by Late Cenomanian-Early Turonian limestones (Bárdossy et al. 1977; Chiocchini et al. 1994). The largest deposits are located in the Campo Felice and Monte Orsello areas, along the first of the mentioned gaps. The bauxites occur here as almost continuous horizons and/or lenses up to 10 m thick and more than 50 m wide.
The textures of the Abruzzi bauxites range from oolitic-pisolitic to arenitic-conglomeratic, this suggesting a continuous reworking of evolved lateritic soils (Bárdossy et al. 1977). Boehmite is the main mineral, and gibbsite has been detected only in traces. The most abundant Fe-mineral is haematite, followed by goethite and rare lepidocrocite. Kaolinite is also widespread, and is particularly concentrated in the bauxite matrix. Anatase and rutile are ubiquitous, as well as several detrital trace minerals: monazite, xenotime, zircon, baddeleyite and ilmenite. Pyrite has been detected in the nuclei of some ooids. In few samples, cavity-filling autigenic REE-fluorocarbonates (i.e. bastnäsite and parisite) have been observed.
Major, minor and trace element analyses have shown that the Abruzzi bauxites are not only mineralogically, but also geochemically similar to those of the Campania mineralised district. They are characterised by the following mean values: ∼55 wt-% Al2O3, ∼20 wt-% Fe2O3, ∼10 wt-% SiO2, ∼2 wt-% TiO2, Sc ∼60 ppm, V ∼270 ppm, Cr ∼240 ppm, Ni ∼200 ppm, Co ∼35 ppm, Zr ∼500 ppm, Ga ∼60 ppm, Y ∼80 ppm and ΣREEs ∼670 ppm.
REEs have variable concentrations along the deposit profile, showing the highest values in correspondence of the bastnäsite/parisite-bearing layers. The REEs concentrations are also positively correlated with Ce/Ce* values. This correspondence indicates that REE autigenic mineral precipitation could be associated with oxidative events related to the uprise of the paleogroundwater table within the deposit, as also observed for the bauxites of the Apulia district by Mongelli et al. (2014). Due to the rapid rise in world demand of ‘critical elements’, our future work will be mainly dedicated to monitor the behaviour of REEs during the bauxitisation process in the Abruzzi deposits, and to their relationship with the supergene mineral phases
Experimental analysis of the polarization effects at variable local temperature and fuel consumption in an 100 kWe SOFC stack
No full textAirborne LiDAR survey for Monte Orsello Fault structural analysis
No full textHigh-resolution airborne LiDAR (Light Detection And Ranging) products may enable precise fault scarps morphometry in active tectonic regions. In this work, we present the geomorphometric and structural analysis of the NW-SE-trending Monte Orsello Fault (MOF), one of the principal segments controlling the Campo Felice Basin in the Central Apennines of Italy. The study employs a High-Resolution Digital Elevation Model (HR-DEM) derived from the airborne LiDAR data, processed through ESRI ArcGIS Pro software, to extract
key morpho-structural features and support detailed mapping of the fault system.
The integrated workflow, combining HR-DEM products with high-precision field data, allowed the identification of surface fault traces, scarp geometry, and geomorphic markers. It based on approaches successfully applied to similar Apennine fault systems (Pucci et al., 2021). Moreover, through this methodology we aimed to quantify post-Last Glacial Maximum (LGM) fault throws and to investigate geometric complexity of the MOF which are critical for understanding regional tectonic evolution and seismic hazard (Schirripa
Spagnolo et al., 2021).
This research demonstrates how integrated geomorphometric techniques and high-resolution remote sensing data can enhance fault scarp characterization and tectonic mapping in complex terrains, contributing new insights into the seismotectonic framework of the Campo Felice Basin (Benedetti et al., 2013)
Experimental analysis of the temperature and voltage distribution of a SOFC generator varying the air stoichiometry and pre-heating temperature
No full textExperimental activity on two tubular solid oxide fuel cell cogeneration plants in a real industrial environment
No full textThe Campo Felice and Monte Orsello bauxite occurrences (Abruzzi, Italy)
No full textBauxite deposits were largely exploited in Italy at the beginning of the 20th century up to the 2nd World War. The most
productive districts were located in the Gargano peninsula, in the Murge and Salento (Apulia), in Campania and in the
Abruzzi region. The Abruzzi bauxite district comprises several deposits, which are currently uneconomic, in the Campo
Felice, Monte Orsello and Monti D’Ocre areas (Apennine Mts.). Similarly to other mineralizations of southern Italy, the
Abruzzi occurrences belong to the karst-type bauxites located along a Late Cretaceous hiatus within a Bahamian-type
carbonate platform succession (Bárdossy et al. 1977). Two main bauxite horizons can be recognized: a first corresponding
to a Late Albian-Early Cenomanian stratigraphic gap and a second bounded by Late Cenomanian-Early Turonian
limestones (Chiocchini et al. 1994). The most prominent deposits occur in the Campo Felice and Monte Orsello areas, in
the first of the mentioned gaps. These bauxites (which are the object of this study) form large lenses up to 10 m thick and
more than 50 m wide.
The textures of the Abruzzi bauxites range from oolitic-pisolitic to arenitic-conglomeratic. Boehmite is the main
mineral, but gibbsite has been detected in trace. The most abundant Fe-mineral is hematite, followed by goethite and
lepidocrocite (rare). Kaolinite is also widespread in all the deposits, and is particularly concentrated in the matrix between
ooids. The Ti-minerals anatase and rutile are ubiquitous, as well as the detrital trace minerals monazite, xenotime, zircon,
baddeleyite, and ilmenite. Pyrite has been detected in the nuclei of some ooids. In few samples, cavity-filling autigenic
REE Ca-fluorocarbonates have been observed. Major, minor and trace element analyses have shown that these bauxites
are not only mineralogically, but also geochemically similar to those of the Matese Mts. and Caserta district, being
characterized by: ~ 55 wt.% Al2O3, ~ 20 wt.% Fe2O3, ~ 10 wt.% SiO2, ~ 2 wt.% TiO2, Sc ~ 60 ppm, V ~ 270 ppm, Cr ~
240 ppm, Ni ~ 200 ppm, Co ~ 35 ppm, Zr ~ 500 ppm, Ga ~ 60 ppm, Y ~ 80 ppm, and ΣREE ~ 640 ppm.
The textures, mineralogy and geochemistry of the Abruzzi deposits suggest a continuous reworking of evolved lateritic
soils, which were progressively mechanically concentrated in karstic depressions where they were further subjected to
local chemical weathering.
Bárdossy G., Boni M., Dall’Aglio M., D’Argenio B. & Pantó G. 1977. Bauxites of peninsular Italy. Composition, origin and geotectonic significance.
Stuttgart, Schweizerbart’sche Verlagsbuchhandlung, Gebr. Borntraeger, Monograph Series on Mineral Deposits, 15, 61 p.
Chiocchini M, Farinacci A., Mancinelli A., Molinari V. & Protetti M. 1994. Biostratigrafia a foraminiferi, dasicladali e calpionelle delle successioni
carbonatiche mesozoiche dell’Appennino centrale (Italia). Studi Geologici Camerti Volume Speciale “Biostratigrafia dell’Italia centrale”, 9-129
- …
