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Αναζήτηση πηγών τροφοδοσίας ψαμμιτών του Νεογενούς στην ιζηματολογική λεκάνη δυτικής Μεσσαράς με χρήση βαρέων ορυκτών

Pitsolis Georgios

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Summary

The Alpine rocks of Crete have been covered, in discordant positions from middle Neogene essentially in clastic sequences, heterogeneous in lithology, variable thickness (50 m until greater than 600 m). Inside the marls and sandstones, which are the primary lithotype of these sequences at various periods, were prepared and Crete hydrocarbons research and exploration. Although a large number of geoscientists has studied these rocks, only few have related these rocks to their paleogeographic evolution during the Neogene - Quaternary, while there is a lack of work on the provenance analysis for areas / locations and the power configurations of clastic material originally formed sediment and then these rocks. Of the 36 samples that were taken from two main sections in the western Messara studied in the fraction of 125 to 90 μm, which was recovered by the method of heavy liquid, the whole of heavy minerals (density greater than 2,94 g / cm3), and after becoming their identification, quantified by the EVA program and then their spatial distribution was studied. The massive presence of minerals of subsidizing the plurality of sample groups, indicates that the feed formulations thereof, although differing in age (Viannos and Ampelouzos Formations) but as shown the results sedimentological analyzes were plated on similar depositional environment, should be sought in the transformed rocks of the Upper Nappe of Inner Hellenides and in the metamorphic rocks of Phyllite Nappe, represented mainly by the presence of chloritoid. These results suggest the hypothesis that decades ago has been proposed but not supported by data, that the main source of clastic sediments which feed the Neogene basins of Crete should be present to the north of Crete, in the central Aegean Sea, where the Upper Nappe of Inner Hellenides is widely spread. These data contribute to the understanding of the complex geotectonic evolution not only of the island of Crete but also the wider region, located at the center of interest for hydrocarbon research.

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