1,720,998 research outputs found
Supplementary note on the pleistocenic una malacofa of the Tacconi Quarry, near Pomezia (Rome, central Italy) [Nota aggiuntiva alla malacofauna pleistocenica della Cava Tacconi nei pressi di Pomezia (Roma)]
No full textPliocenic clay deposits and sand-and-clay deposits of Lower Pleistocene age belonging to the "Monte delle Piche" Series (Emilian substage) outcrop near Pomezia, to the south of Rome, where a rich molluskan fauna was collected by the writers at the 'Tacconi quarry" a few years ago. Samples were taken from sand levels representing the bottom of pleistocenicdeposits in this area. The fossil fauna, amounting to 158 species (1 Brachyopod, 4 Scaphods, 75 Bivalves and 79 Gasteropods), was attributed to a biocenosis of infra-cirealittoraI environment including 20% of Pliocenic survivors, Hyafinea baltica and 2 "northernguests": Arctica islandica and Pseudamussium septemradiatum. Recently, new cuttings at the same quarry have brought to light 13 new molluskan species from the same sand levels. Among these, two other species of "northern guests" have been recognized: Chlamys islandica and Spisula elliptica, which were not common in the Mediterranean basin during Pleistocene times
Hydrogeological study and numerical model of the Suio-Castelforte hydrothermal area (central Italy)
No full textA numerical simulation has been performed through the natural geothermal system of Suio-Castelforte (LT) in order to investigate the hydothermal area and assess its geothermal potentiality. Starting from geological and hydrogeological data a 2D conceptual model has been built. For numerical purpose, the latter idealizes and simplifies the natural system. The area has been affected by a temperature gradient, from low to medium enthalpy, related to the Quaternary volcanism. By a FEM (Finite Element Model) method, using the COMSOL MULTIPHYSICS® software, a homogeneous and isotrope media have been assumed, simulating the groundwater flow and simultaneous heat transfer. Using the porous media approach, Darcy and heat transfer laws have been applied in steady-state conditions. The results have been compared with the collected data and bibliography. © Società Geologica Italiana, Roma 2016
An exposed paleeosurface in the Maccarese coastal plain (province of Rome, central Italy): Concentration of artefacts and stratigraphy [Paleosuperfìcie esposta, concentrazione di industria litica e stratigrafia nella piana costiera di Maccarese (Roma)]
No full textIn 1975 and following years, about 4,000 perfectly preserved flint implements were collected over an area of about 5,000 m2 (called "site B"), near Maccarese (locality "Le Cerquete"), on the coastal area of Rome in central Italy. The implements have been dated back to Middle and Upper Palaeolithic times, their age ranging from the isotopie substage 5a to the end of Pleistocene. During excavations carried out in 1991, a sharp decrease in number of implements was noticed immediately below the ground surface. The soil in which the lithic industry was found, has been classified as a well developed Chromic Luvisol, which is thus certainly not recent. Moreover, we know that there are at least two sedimentary cycles in the evolution of the Maccarese plain, the oldest of them dating 90,000-÷50,000 years B.P. The deposits of this cycle are cut seawards by a scarp outlining a terrace developed between 5 and 12 m a.s.l. The terrace is formed of two partions on the basis of pedologie evidence. The younger sedimentary cycle is related to the Versilian transgression (of Holocene age) with deposits outcropping 2 m a.s.l. The area where the Chromic Luvisol outcrops, has a limited extent and a regular form corresponding to the concentration of lithic implements on the ground surface. It is concluded that the area of maximum concentration of artefacts is not the part that has left of an archaeological living floor, rather it is a typical example of artefacts concentration due to small scale natural phenomena
Le tecnologie meccaniche ambientalmente compatibili per l’estrazione dei minerali
No full textI metodi di separazione fisici consentono di estrarre dalle rocce i minerali necessari all’industria ed in particolare all’industria “high tech” e a quelle che operano per la conversione ecologica. I rifiuti industriali e soprattutto i minerari ospitano minerali che contengono inquinanti che se estratti possono soddisfare le esigenze di approvvigionamento dell’industria, ma anche di procedere alla riqualificazione ambientale delle loro aree di stoccaggio. I materiali sterili una volta privati dai minerali e metalli di interesse minerario perdono il loro carico inquinante e possono essere reimpiegati sia a fini industriali (ad es. feldspati e quarzo) sia come aggreganti nell’edilizia. Il miglioramento tecnologico nelle
strategie di separazione consente di applicare in cave e miniere i principi di economia circolare, non a caso oggi si tende a estrarre i minerali di interesse anche dai rifiuti stoccati nelle discariche delle ex aree estrattive, che per motivi tecnologici nel passato sono stati stoccati nonostante le elevate concentrazioni di risorse. Questa strategia, fortemente incoraggiata dalla UE, consente di recuperare suolo e di agire su prodotti già in pezzatura utile per la loro ottimizzazione ai fini estrattivi. Questo settore è in espansione in quanto l’Europa sta promuovendo piani di autosufficienza nell’approvvigionamento delle risorse minerarie con particolare attenzione alle risorse strategich
Analisi di facies dei depositi tirreniani (Duna Rossa) affioranti nell'area di Castel Porziano-Pomezia (Roma). Una revisione ambientale.
No full textThe refinement of geomorphological and geochemical statistical techniques in the study of clay-basin tectonics: The era basin (central Italy)
No full textA comparative approach to neotectonic studies is presented, which encompasses the integration of geochemical, morphological and structural analyses. Nine-hundred-nine-teen soil gas samples were collected in the Era basin (Tuscany, Central Italy) and their helium contents were measured. Helium distribution has been compared with location and orientation of known brittle deformations (faults and fractures) and morphological features obtained by air-photo interpretation and drainage network analyses. Obtained data were statistically compared by means of rose dia-gram plots concerning the investigated parameters and locally studied by associating the observed helium anomaly ridges with the known morphological and structural elements. The statistical approach showed a good convergence between the applied methodologies. Data from geomorphological, mesostructural, and geochemical surveys are consistent with the NE-SW and NW-SE orientations, i.e. Apennine and anti-Apennine trend of the known structural pattern. Moreover the apparent N-S and E-W trending helium anomalies are thought to be due to the Middle Pleistocene deformation phase along these directions. The relationship between helium distribution and the strain field is strengthen by the good correspondence, at local scale, among geochemical data and results of the structural and geomorphological features (Orciatico-Montecatini Val di Cecina and Peccioli areas). However helium soil gas technique showed to be a sensible tool for neotectonic studies in clay basin, as soil gas defines the leakage of deep seated gas along tectonic discontinuities even if they have no surface evidence and where the clay deposit is hundreds of meters thick
Late-Middle Pleistocene mammal faunas of Latium (central Italy): stratigraphy and environment.
No full textNatural leakage of helium from the Italian sedimentary basins of the Adriatic structural margin. Perspectives for geological sequestration of carbon dioxide.
No full textIndagine morfologica su un tratto del fiume Zambesi, nella Repubblica del Mozambico. Misure batimetriche ed analisi dei dati
Full text linkLo Zambesi è il quarto fiume del continente africano per estensione del bacino idrografico ed è il più importante tra quelli che sfociano nell’Oceano Indiano. Nello Zambesi Inferiore, ovvero nel tratto terminale del fiume che scorre nel territorio della Repubblica del Mozambico, il deflusso è regolato dalla presenza, a monte, delle dighe di Kariba e di Cahora Bassa, costruite nella seconda metà dello scorso secolo. La presenza degli invasi artificiali provoca profondi cambiamenti sul regime idrologico e sulla dinamica dei sedimenti, con prevedibili conseguenze sulla morfologia fluviale e, in generale, sul territorio e sull’ecosistema. Tuttavia, in letteratura non sono disponibili i risultati di rilievi batimetrici o altre misure in sito negli invasi o lungo il corso del fiume per la valutazione del trasporto solido e lo studio della morfodinamica fluviale. Nel marzo 2013, l’ENEA ha condotto un’estesa campagna di ricerca multidisciplinare
lungo un tratto dello Zambesi Inferiore, in collaborazione con la società mozambicana Minas Rio Bravo. Tra le varie attività svolte in campo, sono state eseguite misure batimetriche del fondo fluviale mediante l’utilizzo di ecoscandaglio, GPS e sistema di navigazione/acquisizione integrata. Nel presente rapporto, in particolare, sono descritte le risorse e le metodologie utilizzate per l’esecuzione delle misure batimetriche e l’elaborazione dei dati; sono, inoltre, presentati e discussi i risultati ottenuti, mediante mappe batimetriche e sezioni trasversali. I risultati qui riportati sono uno dei
pochissimi esempi di misure in campo nell’area dello Zambesi Inferiore e potranno essere utilizzati come base di confronto per ulteriori campagne a scopo di monitoraggio, o, eventualmente, come dato di input per la calibrazione e validazione sia di modelli matematici, sia di misure ottenute mediante telerilevamento.The Zambezi River is the fourth largest river in Africa as regards catchment area, and the most important flowing into Indian Ocean. In the Lower Zambezi, i.e. the final reach flowing across the Republic of Mozambique, river flow is regulated by the Kariba and Cahora Bassa dams, built in the second half of the last century. The presence of
impoundments causes important changes on hydrologic regime and dynamics of sediments downstream, with expected consequences on river morphology and, more in general, on territory and ecosystem. However, no results of bathymetric surveys or other in situ measures in the reservoirs and along the river aimed at quantifying sediment
transport and studying river morphodynamic are available in literature. In march 2013 ENEA, in cooperation with Minas Rio Bravo Company (Mozambique), performed an extensive multidisciplinary research along a reach of the Lower Zambezi. Among different field activities, bathymetric measures of riverbed were performed using echo sounder, GPS and integrated navigation/acquisition system. In the present report materials and methods used for bathymetric measures and data processing are described; results are presented and discussed, by means of bathymetric maps and
cross-section graphs. Results hereby reported are one of the fewest examples of direct field measures in the Lower Zambezi area and they can be used either for comparison with further monitoring survey, or, possibly, as input data for validation and calibration of both mathematical models and remote sensing data
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