Search results for " STRUTTURA"
showing 10 items of 271 documents
Outgassing of Mantle Volatiles in Compressional Tectonic Regime Away From Volcanism: The Role of Continental Delamination
2019
In this study we discuss the occurrence of mantle-derived heat and volatiles (i.e., helium and CO 2 ) feeding hydrothermal systems in a seismically active margin between two convergent plates (African and European) without any signals of volcanism. The helium (He) isotopes clearly indicate a mantle-derived component in the outgassing volatiles. The estimated mantle-derived He fluxes are up to two to three orders of magnitude greater than those in a stable continental area. Such high He fluxes cannot be provided by a long-lasting diffusion, thereby implying a more efficient transport (i.e., advective transport through faults). He data coupled to heat-He relationship suggest the occurrence of…
New Evidence of MIS 3 Relative Sea Level Changes from the Messina Strait, Calabria (Italy)
2021
Investigation of sea-level positions during the highly-dynamic Marine Isotope Stage 3 (MIS 3: 29–61 kyrs BP) proves difficult because: (i) in stable and subsiding areas, coeval coastal sediments are currently submerged at depths of few to several tens of meters below the present sea level
A stalactite record of four relative sea-level highstands during the Middle Pleistocene Transition
2017
International audience; Ice-sheet and sea-level fluctuations during the Early and Middle Pleistocene are as yet poorly understood. A stalactite from a karst cave in North West Sicily (Italy) provides the first evidence of four marine inundations that correspond to relative sea-level highstands at the time of the Middle Pleistocene Transition. The speleothem is located ∼97 m above mean sea level as result of Quaternary uplift. Its section reveals three marine hiatuses and a coral overgrowth that fixes the age of final marine ingression at 1.124 ± 0.2, thus making this speleothem the oldest stalactite with marine hiatuses ever studied to date. Scleractinian coral species witness light-limited…
La Tecnologia. Struttura economica e produttività
2012
Il capitolo indaga l'evoluzione della struttura produttiva in 24 paesi del mediterraneo dal 1980 al 2010 e valuta come il cambiamento strutturale è associato a variazioni della produttività nei diversi paesi e settori. The chapter offers and inquiry into the evolution of the economic structure of 24 Mediterranean countries from 1980 to 2010 and examines how structural change is associated to productivity growth in different sectors and countries.
Palaeogeographical evolution of the Egadi Islands (western Sicily, Italy). Implications for late Pleistocene and early Holocene sea crossings by huma…
2019
Abstract The continental shelf morphology offshore of western Sicily suggests that during the Last Glacial Maximum (LGM, 20 ka cal BP), two of the Egadi Islands, Favignana and Levanzo, were connected to Sicily by a wide emerged plain, while Marettimo was only separated from the other islands by a narrow channel. We studied the relative sea-level variation from the LGM until today, focussing on two important time slices: the Mesolithic (9.5–13 ka cal BP) and the Neolithic (6.5–7.5 ka cal BP). In this research, we discuss a sea-level rise model by means of geomorphological, archaeological and geophysical observations and new radiocarbon dating of marine and terrestrial fossil fauna. The resul…
Surface expression of eastern Mediterranean slab dynamics: Neogene topographic and structural evolution of the southwest margin of the Central Anatol…
2012
The southwest margin of the Central Anatolian Plateau has experienced multiple phases of topographic growth, including the formation of localized highs prior to the Late Miocene that were later affected by wholesale uplift of the plateau margin. Our new biostratigraphic data limit the age of uplifted marine sediments at the southwest plateau margin at 1.5 km elevation to <7.17 Ma, and regional lithostratigraphic correlations imply that the age is <6.7 Ma. Single-grain CA-TIMS U-Pb zircon analyses from a reworked ash within the marine sediments yield dates as young as 10.6 Ma, indicating a maximum age that is consistent with the biostratigraphy. Our structural measurements within the uplifte…
Clastic vs. primary precipitated evaporites in the Messinian Sicilian basins
2006
I Modelli di Equazioni Strutturali: Temi e prospettive
2013
Le pieghe minori nelle Unità Imeresi e Trapanesi dei Monti di Palermo ed il loro significato nell’evoluzione tettonica dell’area
2003
In questo lavoro sono riassunte le osservazioni sulle pieghe minori che interessano i terreni delle Unità Imeresi e Trapanesi del settore orientale dei Monti di Palermo, con l'obbiettivo di: a) descri-vere la geometria e lo stile deformativo delle mesopieghe e stabilirne le relazioni spazio-temporali con le pieghe maggiori e le altre strut-ture minori (clivaggi, joints); b) ricavare, attraverso l'analisi stati-stica dei dati giaciturali, l'orientazione dei campi deformativi asso-ciati alle strutture plicative; c) ricostruire il significato delle pieghe minori nell'evoluzione tettonica dell'area. Nelle Unità Imeresi e Trapanesi, l'analisi statistica dei dati e le osservazioni di campagna han…
Preparazione e caratterizzazione di compositi polimerici funzionali a base di nanostrutture carboniose
Obiettivo di questo lavoro è la realizzazione di materiali nanocompositi polimerici utilizzando come matrice la resina epossidica commerciale Epikote828 e come filler nanotubi di carbonio (CNT) e nanoplacchette di grafene (GNP) e la caratterizzazione funzionale per applicarli come schermi per interferenze elettromagnetiche. Per correlare le proprietà funzionali alle proprietà morfologico-strutturali, i materiali sono stati analizzati mediante microscopia acustica a scansione (SAM) per valutare la dispersione del filler, spettroscopia Raman e per verificare risonanza magnetica nucleare in stato solido (ss-NMR) per studiare le interazioni filler-matrice e test di nanoindentazione per studiare…