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Interpretation of gravity data to delineate structural features connected to low-temperature geothermal resources at Northeastern Portugal |
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| Institution: | 1. Laboratório Nacional de Energia e Geologia, Amadora, Portugal;2. University of Lisbon-IDL, Ed C8 Campo Grande, Lisboa, Portugal;3. Instituto Politécnico de Tomar, Tomar, Portugal;4. Instituto Superior de Engenharia de Lisboa, Lisboa, Portugal;1. Dipartimento di Scienze della Terra dell''Ambiente e delle Risorse (DiSTAR), University “Federico II” of Naples, Italy;2. Instituto de Geociencias (IGEO, CSIC-UCM), C/Doctor Severo Ochoa, 7, Facultad de Medicina (Edificio Entrepabellones 7 y 8), 28040 Madrid, Spain;3. Facultad de Matemáticas, Universidad Complutense de Madrid, Plaza de Ciencias 3, 28040 Madrid, Spain;4. Research Group ‘Geodesia’, Universidad Complutense de Madrid, Spain;5. Istituto Nazionale di Geofisica e Vulcanologia, Italy |
| Abstract: | A great number of low-temperature geothermal fields occur in Northern-Portugal related to fractured rocks. The most important superficial manifestations of these hydrothermal systems appear in pull-apart tectonic basins and are strongly conditioned by the orientation of the main fault systems in the region. This work presents the interpretation of gravity gradient maps and 3D inversion model produced from a regional gravity survey. The horizontal gradients reveal a complex fault system. The obtained 3D model of density contrast puts into evidence the main fault zone in the region and the depth distribution of the granitic bodies. Their relationship with the hydrothermal systems supports the conceptual models elaborated from hydrochemical and isotopic water analyses. This work emphasizes the importance of the role of the gravity method and analysis to better understand the connection between hydrothermal systems and the fractured rock pattern and surrounding geology. |
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