Search results for "Greece"

Extreme isotope fractionation of hydrothermal methane due to oxidation processes in hot springs of Central Greece

2017

The Greek territory belongs to the geodynamically active Alpine-Himalayan orogenic belt. As such, it shows intense seismic activity, active volcanic systems and areas of enhanced geothermal fluxes. One of these areas is the Sperchios basin and the northern part of Evia island in central Greece, which present widespread thermal manifestations [1]. Five of them with temperatures from 33 to 80°C present bubbling gases whose dominating species are either CO2 or N2. All gases contain from 27 to 4000 ppm of CH4. The isotopic composition of CH4 in these gases covers a wide range with δ13C values ranging from -21.7 to +16.9‰ and δ2H values ranging from -124 to +301‰. The hottest manifestation displ…

Gas geochemistry and CO2 output estimation of Milos Island (Greece)

2018

Several gas samples have been collected from natural gas manifestations in the island of Milos. Most of them are located underwater along its coasts, whereas three anomalous degassing fumarolic areas (Kalamos, Paleochori and Adamas) were identified on land. Almost all the gases have CO2 as the prevailing gas species, with concentrations ranging from 88 to 99% for the samples taken underwater, while the on-land manifestations present a wider range (15-98%), being sometimes heavily contaminated by air. Methane reaches up to 1.0%, H2 up to 3.2% and H2S up to 3.5% indicating a hydrothermal origin of the gases. The isotope composition of He shows values ranging from 2.55 to 3.39 R/RA, highlighti…

Characterization of trace elements in thermal and mineral waters of Greece

2023

: Natural thermal and mineral waters are widely distributed along the Hellenic region and are related to the geodynamic regime of the country. The diverse lithological and tectonic settings they are found in reflect the great variability in their chemical and isotopic composition. The current study presents 276 (published and unpublished) trace element water data and discusses the sources and processes affecting the water by taking into consideration the framework of their geographic distribution. The dataset is divided in groups using temperature- and pH-related criteria. Results yield a wide range of concentrations, often related to the solubility properties of the individual elements and…

Minerali, piante, animali e uomini: indagine lessicale sul rapporto tra i regni naturali e l’ambiente nella Grecia antica

2021

L’articolo indaga il rapporto che sussiste nella Grecia antica tra la terra e i cosiddetti «regni naturali» (minerale, vegetale, animale, umano) alla luce del lessico utilizzato per indicarlo e mostra che, a differenza di quanto avviene presso di noi, esso è spesso analogo per tutti e quattro gli ambiti. L’azione della terra (o altri elementi eco-sistemici) nei confronti degli elementi che appartengono ai diversi regni, infatti, è tendenzialmente designata dagli stessi verbi (vengono presi in considerazione phýein, ghennán, bóskein, tréphein, phérein, anadidónai): la terra phýei (e ugualmente possono essere usati anche gli altri verbi) sia uomini, sia animali, sia piante, sia minerali. Th…

Incidence of impacted and supernumerary teeth-a radiographic study in a North Greek population.

2010

Objectives: The aim of the present study was to investigate the prevalence of impacted and supernumerary teeth, apart from third molars. Study design: This was a retrospective study of 1.239 panoramic radiographs taken of patients who presented to the Department of Dentoalveolar Surgery, Implantology and Radiology at the School of Dentistry of the Aristotle University of Thessaloniki, Greece between 1991 and 1999. The panoramic radiographs and dental records were reviewed in order to determine whether there were impacted or supernumerary teeth. Observations were also made on the space in dentition, corresponding to the position of each impacted tooth, the lack of space for tooth eruption, t…

Differential Greek and northern African migrations to Sicily are supported by genetic evidence from the Y chromosome

2009

The presence or absence of genetic heterogeneity in Sicily has long been debated. Through the analysis of the variation of Y-chromosome lineages, using the combination of haplogroups and short tandem repeats from several areas of Sicily, we show that traces of genetic flows occurred in the island, due to ancient Greek colonization and to northern African contributions, are still visible on the basis of the distribution of some lineages. The genetic contribution of Greek chromosomes to the Sicilian gene pool is estimated to be about 37% whereas the contribution of North African populations is estimated to be around 6%. In particular, the presence of a modal haplotype coming from the southern…

Composition and distribution of volcanic gases inside the Lakki Caldera (Nisyros, Greece): preliminary results

2013

Riso e sorriso e altri saggi sulla nonviolenza nella Grecia antica

2018

Is nonviolence a specificity of oriental culture? The book explores the presence, in ancient Greece, of forms of thought and actions that can be brought back to the idea of nonviolent conflict management. It identifies the role that laughter and smile can play in the resolution of interpersonal contrasts; it illustrates the advice of ‘work on oneself’ as well as on the other, given by ancient philosophers; it focuses on some rules to combat violence without resorting to violence; it presents female mediation practices and identifies various forms of diplomacy, both from above and from below; at least it shows the effective dynamics in view of the reconciliation between adversaries in cases …

Late palaeozoic magmatism in the basement rocks Southwest of Mt. Olympos, Central Pelagonian zone, Greece: Remnants of a permo-carboniferous magmatic…

2001

We dated basement rocks from several localities southwest of Mt. Olympos, as well as from a locality near the top of the mountain using the single zircon Pb/Pb evaporation technique. For the samples southwest of the mountain, the ages obtained range from ca. 280 to 290 Ma, with only a few zircon grains being around 300 Ma. By contrast, the sample from near the top of the mountain appears to be slightly younger, with ca. 270 Ma. These ages imply that the granitoids crystallized during Late Carboniferous - Early Permian times, and are therefore younger than the basement gneisses of other regions of the Pelagonian zone, which yielded zircon ages of around 300 Ma (e.g. Yarwood & Aftalion 19…

Le superfici murarie a vista: restauri a Palermo e a Rodi (fine se. XIX- prima metà sec. XX)

2018

Il saggio indaga la particolare tecnica di restauro delle superfici murarie lasciate a vista dell’architettura medievale considerando alcuni casi nella città di Palermo e di Rodi in Grecia (fine del sec. XIX - prima metà del sec. XX). In particolare, dopo avere eliminato gli strati di intonaco, anche quelli coevi alla costruzione, l’architettura medievale era sottoposta ad interventi di rifacimento delle superfici sia interne che esterne, mediante la tecnica dell’”impiallicciatura”, cioè ricostruendo i filari dei conci delle murature con materiale simile per natura, dimensioni e colore, o estraendo il concio degradato, resecando la parte ammalorata e ricollocandolo nella muratura. Questa op…