Article Dans Une Revue Episodes Journal of International Geoscience Année : 2025

Preliminary hydrogeological implications using structural analysis and cave mapping: a case study of the Pachnes Thrust, Central Lefka Ori, Crete

Résumé

This multidisciplinary study integrates structural and cave mapping, 3D geological modeling, and Geographical Information System (GIS) analysis to provide constraints of the hydrogeological model for the central Lefka Ori Massif. Through 44 km of linear mapping, we discovered the new mid-Miocene Pachnes Thrust (PT) which plays a key role in the central Lefka Ori Massif structural framework. The thrust dips NE to ENE with >11 km of displacement. It significantly controlled the karst evolution in the central Lefka Ori Massif. The 3D geological model was developed using mapping data on the dip direction and dip angle of the PT, in conjunction with consideration of thrust-related rearrangement of formations. The PT distinguishes aquifers with varying hydraulic responses and explains out-of-catchment inflow. Karstification in the Lefka Ori Massif has been controlled by tectonic uplift, and movements along the PT created new vertical contacts of contrasting lithologies – Late Triassic massive limestones and dolostones in the hanging wall against Dogger-Oligocene thin-bedded limestones with chert in the footwall. The caves exhibit sub-horizontal passages along the PT and a juvenile karst system in the hanging wall with vertical shafts linked to strike-slip faults.

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Dates et versions

hal-05116094 , version 1 (17-06-2025)

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Daniel Moraetis, Aris Leontaritis, Andreas Scharf, Charalampos Fassoulas, Stylianos Zacharias, et al.. Preliminary hydrogeological implications using structural analysis and cave mapping: a case study of the Pachnes Thrust, Central Lefka Ori, Crete. Episodes Journal of International Geoscience, 2025, ⟨10.18814/epiiugs/2025/025015⟩. ⟨hal-05116094⟩
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