Search results for "Greece"

Geochemical characterization of groundwater quality in Hellenic karst systems

2019

Karst aquifers are considered to be one of the most important aquifer types, as they constitute the main drinking water resource for the majority of the global population (Ford et al., 2007). They are generated from the dissolution of carbonate rocks (e.g. limestone, dolomite, marble etc.), a phenomenon commonly known as “karstification”. This process is mainly caused by the acidity of water enriched in dissolved CO2, with the concentration of the latter being dependent on both the temperature and the CO2 partial pressure of the atmosphere in contact with the water (Bakalowicz, 2005). Carbonate rocks cover about 35% of the land surface of Greece and are mainly located in the western, centra…

Catalogue of the main gas manifestation of Greece: Geochemical characterisation and preliminary gas hazard assessment

2014

Quantification of gaseous emissions in geological systems is an important branch because it is a major source of greenhouse gas to the atmospheric budget. Of geological environments, there are two different categories: the first category includes emissions of the predominant carbon dioxide (CO 2), while the second includes emissions of the predominant methane (CH4). The Hellenic territory has a very complex geodynamic setting deriving from a long and complicated geological history. It is strongly characterized by intense seismic activity and enhanced geothermal gradient. This activity, with the contribution of an active volcanic arc, favours the existence of many cold and thermal gas manife…

Catalogue of the main gas manifestation of Greece: a basis for nationwide estimations of gas hazard and total geogenic gas output

Microbial impact on the isotope composition of methane in both thermal and hyperalkaline waters of central Greece

2019

Introduction The different origins of methane can be subdivided in biogenic (either directly produced by microbial activity or deriving by decay of organic matter at T > 150°C) and abiogenic (from pure inorganic reactions). Among the latter, one of the most debated origins comes from serpentinization processes of ultramafic rocks in ophiolitic sequences at low temperatures (T < 80 °C). Moreover, further secondary processes (diffusion, inorganic or microbial oxidation, etc.) may also contribute and thus mask the original chemical and/or isotope composition. Primary and secondary processes acting on CH4 can be recognised mainly through its isotope (d13C and d2H) composition and the rati…

Estimation of CO2 release from thermal springs to the atmosphere

2019

Introduction Geodynamically active regions have long been recognized as areas of anomalous Earth degassing [Irwin and Barnes, 1980]. Areas found at plate boundaries are characterized by seismic, volcanic and geothermal activity as well as ore deposition. These processes are enhanced by the circulation of hydrothermal fluids in the crust, which transport volatiles from the deep crust or mantle to the surface [King, 1986]. Kerrick and Caldera, [1998], were the first to indicate the significant contribution of the CO2 degassing by extensional tectonic and hydrothermal activity in metamorphic belts during the Phanerozoic. Moreover, further studies concerning gas emissions from diffuse degassing…

The fluids’ geochemistry along the "Sperchios Basin - Northern Evoikos Gulf" Graben, a geodynamically complex area of Central Greece

2013

Origin and evolution of the fluids emitted along the “Sperchios Basin – Evoikos Gulf” Graben (Central Greece)

2013

Initial French language teacher education policy in Greece and curriculum evaluation among student teachers of FLE

2015

This paper presents initial language teacher education policy adopted in Greece and describes a study which examines student teachers’ of FLE (Français Langue Étrangère) perception of their initial teacher education and its contribution to their future professional life. The sample comprised 67 student teachers in their fourth year of studies for a bachelor degree in the department of French language and literature in the Aristotle University of Thessaloniki in Greece. Data were collected through questionnaires which included both a structured and an open-ended part. The questionnaire’s content was based on the European Profile for Language Teacher Education — a Frame of Reference (Kelly et…

Carbon degassing through karst hydrosystems of Greece

2022

Estimation of CO2 degassing from active tectonic structures and regional hydrothermal systems is essential for the quantification of presentday Earth degassing [Frondini et al., 2019 and references therein]. Due to the high solubility of CO2 in water, great amounts of deep inorganic carbon can be dissolved, transported, and released from regional aquifers. By applying a massbalance approach [Chiodini et al., 2000], different sources of the dissolved CO2 can be discriminated. The main source of degassing in Greece is concentrated in hydrothermal and volcanic areas. However, deep CO2 from active tectonic areas has not yet been quantified. A key point of this research is to investigate the pos…

Cesarea di Mauretania: la piccola Grecia di Giuba II, tra bronzi e marmi

2020

Punic Iol, renamed Caesarea in honour of Augustus under Juba II, and promoted by the latter to the rank of capital of the kingdom of Mauretania entrusted to him by the princeps in 25 B.C., underwent a splendid phase of development on the model of Hellenistic cities precisely between the end of the 1st century B.C. and the first part of the 1st century A.D. It is very probable that Juba II, who had grown up in Rome, had provided Caesarea with a port, as the intense trade with the Iberian Peninsula, Gaul and Italy, from whose marble quarries material was extracted for architectural constructions and decorations, as well as from those in Greece, would prove. Caesarea has returned a complex of …