Title: Φυσική ραδιενέργεια των κλαστικών και ανθρακικών ιζημάτων στην περιοχή ανατολικά της Ηγουμενίτσας
Abstract: The subject of postgraduate thesis «Natural radioactivity of clastic and carbonate sediments located eastern of Igoumenitsas area (Western Greece)» is dealing with the recognition, study and analysis of natural radioactivity of natural radionuclides U238, Th232, Ra226 και K40 in the Miocene (Aquitanian) clastic deposits, Eocene and Oligocene clastic deposits of the submarine fans and their concentration amount in the older carbonate and contemporary clastic sequences of the study area located in the village Neraida of Thesprotia. It also deals with the interpretation of results in terms of the identification of the source.
The study area is located in the basin of Filiates-Paramithia of Epirus and constitutes a part of the flysch syclins, developed in Western Greece within the Ionian zone, due to the activity of internal thrusts.
The sampling was accomplished in the carbonate and clastic sequences, with the collection of 45 rock samples: 8 limestones, 18 sandstones, 18 siltstones and 1 sample of contemporary fluvial sand. The sedimentological units description was based in bibliographical data, since sedimentological and geochemical analyses were not accomplished. The clastic sequences were classified based on the geological map of I.G.M.E. Filiates sheet 1962-63, 1:50.000, as Upper Flysch depotites Aquitanian ages and Ag. Panton Flysch deposites Eocene-Oligicene ages.
Towards the radiochemical research a sequence of radiochemical analyzes were accomplished, in order to evaluate the activity concentration of natural radionuclides of carbonate and clastic sequences, with the aim of locating their source and the potential of their storage in these specific formations. The activity concentration measurement of 238U, 226Ra, 232Th, and 40K was carried out with gamma-spectometry method, using the High Purity Germanium detector (HPGe) of Canberra Company.
The main aim of this effort was the establishment of the existence of the natural radionuclides in the carbonate sequence, as well as their concentration in the clastic sequence, due to their secondary migration from the already identified phosphatic deposits of the adjacent areas.
None of the studied geological formations of the study area presented exaggerating activity concentration of natural radionuclides values. The carbonate sequence in terms of the studied natural radionuclides was characterized as quite poor, contrasting to the clastic sequence, which generally showed increasing activity concentration of natural radionuclides values. Finally, based on the concentrations traced in the contemporary fluvial deposits of the study area, the Quaternary sediments of the area were characterized as sufficiently enriched, concluding to the existence of contemporary source of natural radionuclides through horizontal faults.
Concluding, the Eocene – Oligocene clastic sequences of Ag. Panton Flysch and the Quaternary sediments of the area, are not characterized as immediately preferred formations for the usage of aggregate materials, while additionally a more extensive research in the Quaternary formations of External Ionian Zone is suggested.
Publication Year: 2012
Publication Date: 2012-11-08
Language: en
Type: dissertation
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