DBPapers
DOI: 10.5593/sgem2012/s02.v2026

NEW CONCEPTUAL MODEL OF GEOLOGY AND HYDROGEOLOGY OF SW CRETE, BASED ON THE EXTENSION OF TRYPALI UNIT IN THE REGION

E. MANUTSOGLU, E. STEIAKAKIS
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 199 - 206 pp

ABSTRACT

The geological conceptual model is a key source of uncertainty in predictions of
groundwater flow. Groundwater modellers typically have a prior knowledge about the
reservoir data based on existing geologic maps, outcrops, lithological logs, pumping
data and hydrogeological properties of the groundwater system. Uncertainties in the
simulation results are largely dominated by uncertainties arising from the definition of
the boundary conditions. Groundwater management in karst is often more difficult,
because the geologic heterogeneity controlling the groundwater flow is often
insufficiently mapped.
The Alpine basement of Crete is composed of a number of fault bounded tectonic units
with different lithologies, paleogeographical origin and metamorphic grade. Among
others, a group of metamorphic rocks, composed mainly of phyllite and quartzite, has
been described through time with variable names. This Group lies between Tripolitza
nappe and Crete-Mani Unit/Plattenkalk Group or/and the Trypali Unit, and its
maximum surface extension is located in W. Crete. Trypali Unit consists of carbonate
formations with intensive karstification and forms a separate hydrogeological entity in
the area. The stratigraphic position of Phyllite/Quartzite Series in western Crete (normal
or overturned), as well as the extension of the Trypali Unit, still remains a matter of
debate.
In order to answer the main questions related to the hydrogeology of the region, the
relation between the crystalline carbonate formations (Trypali Unit) and the metaclastic
formations (Phyllite/Quartzite Series) was investigated and a new lithological map of an
area (of about 80 km2) was created. This map can be used to clarify the hydrogeological
regime in the area and to evaluate the available groundwater resources.

Keywords: Karst environment, geological mapping, conceptual model,
Phyllite/Quartzite Series, Trypali Unit, Western Crete