HYDROCHEMICAL STUDY OF THE HOT GROUNDWATER OF AMPELIA AREA, EASTERN THESSALY, GREECE. A NEW AREA WITH GEOTHERMAL INTEREST

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Published: Jul 27, 2016
DOI: https://doi.org/10.12681/bgsg.11777
Keywords:
geothermal energy hot groundwater geochemistry trace element and ion concentration Eastern Thessaly Greece
C. Kanellopoulos
Institute of Geology and Mineral Exploration
M. Christopoulou
Institute of Geology and Mineral Exploration
P. Vakalopoulos
Institute of Geology and Mineral Exploration
Th. Efthimiopoulos
Institute of Geology and Mineral Exploration
M. Xenakis
Institute of Geology and Mineral Exploration
Abstract

Ampelia area is a newly discovered area with geothermal interest and no surface manifestations (hidden resource). It is located in Farsala basin and belongs to the Enipeas graben. The geothermal anomaly is related with the E-W trending faults, which mainly control the basin development and the NNW-SSE trending faults of the area. The temperature values from the deep water boreholes (>200m depth) range from 20 to 41oC. The chemical composition of the studied groundwater samples varies in all chemical parameters. Most of the samples have affected by shallow cold aquifers (high E.C. and NO3- values). The most representative samples (T > 30oC) are from the deepest boreholes (hydrochemical type Na-HCO3), which cut the fractured crystalline basement, i.e. limestones, flysch and ophiolitic rocks. They present the highest pH values (pH > 8) and the lowest E.C. compared with the rest of the samples. Their Ni and Cr concentrations are very low, indicating that the groundwater is not
in contact with the ultramafic rocks from the ophiolite sequence. According to silica chemical geothermometers for the most representative samples, the expected temperature values of a potential geothermal reservoir range from ~ 60 to 100oC.

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  • Engineering Geology, Hydrogeology, Urban Geology
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