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New geological conceptual model in western model in western Crete based on the extension of Trypali unit

Manoutsoglou Emmanouil, Steiakakis Manolis

Πλήρης Εγγραφή

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Περίληψη

Geological conceptual models play an important role on the simulation of water flow. Groundwatermodellers typically have a prior knowledge about the reservoir data with the help of existinggeologic maps, outcrops, lithological logs, pumping data and hydrogeological properties of thegroundwater system. Uncertainties in the simulation results are largely dominated by uncertaintiesarising from the definition of the boundary conditions. Groundwater management in karst is oftenmore difficult, because the geologic heterogeneity controlling the groundwater flow, is ofteninsufficiently mapped.The Alpine basement of Crete is composed of a number of fault bounded tectonic units withdifferent lithologies, paleogeographical origin and metamorphic grade. Among others, a group ofmetamorphic rocks, composed mainly of phyllite and quartzite, has been described through timewith variable names. This Group lies between Tripolitza nappe and Crete-Mani Unit/PlattenkalkGroup or/and the Trypali Unit, and its maximum surface extension is located in W.Crete. TrypaliUnit consists of carbonate formations with intensive karstification and forms a separatehydrogeological entity in the area. The stratigraphic position of Phyllite/Quartzite Series in westernCrete (normal or overturned), as well as the extension of the Trypali Unit, still remains a matter ofdebate.In order to answer the main questions related to the hydrogeological framework of the region therelation between the crystalline carbonate formations (Trypali Unit) and the overlying metaclasticformations (Phyllite/Quartzite Series) was investigated and a new lithological map of an area of 80km2 was created. This map can be used to clarify the hydrogeological regime and to evaluate theavailable groundwater resources in the area.

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