Jurnal Internasional Pengontrolan topografi dan sesar sirkulasi hidrotermal sepanjang gangguan dorman pada orogen. – Taillefer – – Geokimia, Geofisika, Geosystems

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Jurnal Internasional Pengontrolan topografi dan sesar sirkulasi hidrotermal sepanjang gangguan dorman pada orogen. – Taillefer – – Geokimia, Geofisika, Geosystems

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Hydrothermal systems involving dormant disturbances in orogenic belts are rarely targeted for geothermal exploration, partly due to the complexity of 3-D topography, unknown permeability of fault zones and basement lithology, and lack of deep-level data. This study brings together various types of surface information (semi features, geological, topographic, hydrochemical data) to explain the harmony of 29 hot springs (29-73 ° C) throughout the sleep disorder Têt (Eastern Pyrénées, France). The concentration of water ions, stable water isotopes and lithium isotope ratios shows that (i) liquids originating from meteoric water infiltration above 2000 m altitude, (ii) rocks that interact with fluid similar to all springs, and (iii) maximum fluid temperature at depth shows the same variation along the fault and on the surface. A 3-D numerical model of the system, assembled from field structural data and from the Digital Elevation Model, explores the combination of permeability for basements and for three-fault networks. The model shows that for relatively permeable dungeons (10 -16 2 ), liquid topography-driven to thousands of meters (up to – 3700 m) before being captured by more permeable Têt errors . The hot water temperature can be reproduced numerically when the permeability error is around 10 -14 m. 2 values ​​that are slightly lower than critical permeability that free convection will occur in error Têt. Our study shows that thermal anomalies may occur along dormant disturbances close to high topography in the orogenic belt core, thus opening up new perspectives for geothermal exploration.

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