A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach
International audience Ophiolites are found all over the world: from the Alps to the Himalayas, in Cuba, Papua-New Guinea, New Caledonia, Newfoundland, etc. They are composed of hard rocks—basalt, dolerite, gabbro and peridotite, which are formed at the mid-oceanic ridges, with specific ridge-relate...
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ftbrgm:oai:HAL:hal-03763638v1 2024-05-19T07:44:20+00:00 A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach Dewandel, Benoît Lachassagne, Patrick Boudier, Françoise Al-Hattali, Saïd Ladouche, Bernard Pinault, Jean-Louis Al-Suleimani, Zaher Bureau de Recherches Géologiques et Minières (BRGM) Indo-French Center for Groundwater Research (IFCGR) Bureau de Recherches Géologiques et Minières (BRGM)-National Geophysical Research Institute Hyderabad (NGRI) Institut des Sciences de la Terre, de l'Environnement et de l'Espace de Montpellier (ISTEEM) Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS) 2005-10 https://brgm.hal.science/hal-03763638 https://doi.org/10.1007/s10040-005-0449-2 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s10040-005-0449-2 hal-03763638 https://brgm.hal.science/hal-03763638 doi:10.1007/s10040-005-0449-2 ISSN: 1431-2174 EISSN: 1435-0157 Hydrogeology Journal https://brgm.hal.science/hal-03763638 Hydrogeology Journal, 2005, 13 (5-6), pp.708-726. ⟨10.1007/s10040-005-0449-2⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2005 ftbrgm https://doi.org/10.1007/s10040-005-0449-2 2024-05-02T00:09:59Z International audience Ophiolites are found all over the world: from the Alps to the Himalayas, in Cuba, Papua-New Guinea, New Caledonia, Newfoundland, etc. They are composed of hard rocks—basalt, dolerite, gabbro and peridotite, which are formed at the mid-oceanic ridges, with specific ridge-related tectonic fracturing and intense hydrothermal alteration. Their geological and thus their hydrogeological properties differ from those of both granite or “classical” gabbro and “classical” basaltic lava. A conceptual hydrogeological model of these hard-rock aquifers was developed based on the convergent results of a multidisciplinary approach at several spatial scales, from rock-sample (centimetre) to catchment (kilometre), on well-preserved ophiolite rocks in Oman. In ophiolite rocks, groundwater circulation takes place mostly in the fissured near-surface horizon (≈50 m thick), and, to a lesser degree, in the tectonic fractures. Hydrograph analysis (Water Resour Res 34:233–240, 1977), interpretation of numerous pumping tests using both classical Theis and dual porosity models [Water Resour Res 32:2733–2745, 1996; Comput Geosci J (in press)], and mercury porosity and hydraulic conductivity lab-measurements support the aquifer parameter estimates. The hydraulic conductivity K of the fissured horizon is estimated at 10−5 to 10−6 m/s for gabbro and dolerite, and 10−7 m/s for peridotite. The storage coefficient S of the peridotite aquifer is estimated at 10−3 and appears to be controlled mainly by microcracks (20 to 100 μm wide). Tectonic fractures in the ophiolite have similar hydrodynamic properties regardless of lithology (10−1<T<10−4 m2/s and 10−1<S<10−3) though the probability of obtaining productive wells is two to three times greater in gabbro and dolerite than in peridotite. Some of the tectonic fractures produce small hydrothermal, hyperalkaline springs in the peridotite. The water budget and hydrochemistry of the Oman ophiolite are characterized and support the conceptual hydrogeological model. ... Article in Journal/Newspaper Newfoundland BRGM: HAL (Bureau de Recherches Géologiques et Minières) Hydrogeology Journal 13 5-6 708 726 |
institution |
Open Polar |
collection |
BRGM: HAL (Bureau de Recherches Géologiques et Minières) |
op_collection_id |
ftbrgm |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Dewandel, Benoît Lachassagne, Patrick Boudier, Françoise Al-Hattali, Saïd Ladouche, Bernard Pinault, Jean-Louis Al-Suleimani, Zaher A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Ophiolites are found all over the world: from the Alps to the Himalayas, in Cuba, Papua-New Guinea, New Caledonia, Newfoundland, etc. They are composed of hard rocks—basalt, dolerite, gabbro and peridotite, which are formed at the mid-oceanic ridges, with specific ridge-related tectonic fracturing and intense hydrothermal alteration. Their geological and thus their hydrogeological properties differ from those of both granite or “classical” gabbro and “classical” basaltic lava. A conceptual hydrogeological model of these hard-rock aquifers was developed based on the convergent results of a multidisciplinary approach at several spatial scales, from rock-sample (centimetre) to catchment (kilometre), on well-preserved ophiolite rocks in Oman. In ophiolite rocks, groundwater circulation takes place mostly in the fissured near-surface horizon (≈50 m thick), and, to a lesser degree, in the tectonic fractures. Hydrograph analysis (Water Resour Res 34:233–240, 1977), interpretation of numerous pumping tests using both classical Theis and dual porosity models [Water Resour Res 32:2733–2745, 1996; Comput Geosci J (in press)], and mercury porosity and hydraulic conductivity lab-measurements support the aquifer parameter estimates. The hydraulic conductivity K of the fissured horizon is estimated at 10−5 to 10−6 m/s for gabbro and dolerite, and 10−7 m/s for peridotite. The storage coefficient S of the peridotite aquifer is estimated at 10−3 and appears to be controlled mainly by microcracks (20 to 100 μm wide). Tectonic fractures in the ophiolite have similar hydrodynamic properties regardless of lithology (10−1<T<10−4 m2/s and 10−1<S<10−3) though the probability of obtaining productive wells is two to three times greater in gabbro and dolerite than in peridotite. Some of the tectonic fractures produce small hydrothermal, hyperalkaline springs in the peridotite. The water budget and hydrochemistry of the Oman ophiolite are characterized and support the conceptual hydrogeological model. ... |
author2 |
Bureau de Recherches Géologiques et Minières (BRGM) Indo-French Center for Groundwater Research (IFCGR) Bureau de Recherches Géologiques et Minières (BRGM)-National Geophysical Research Institute Hyderabad (NGRI) Institut des Sciences de la Terre, de l'Environnement et de l'Espace de Montpellier (ISTEEM) Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Dewandel, Benoît Lachassagne, Patrick Boudier, Françoise Al-Hattali, Saïd Ladouche, Bernard Pinault, Jean-Louis Al-Suleimani, Zaher |
author_facet |
Dewandel, Benoît Lachassagne, Patrick Boudier, Françoise Al-Hattali, Saïd Ladouche, Bernard Pinault, Jean-Louis Al-Suleimani, Zaher |
author_sort |
Dewandel, Benoît |
title |
A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach |
title_short |
A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach |
title_full |
A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach |
title_fullStr |
A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach |
title_full_unstemmed |
A conceptual hydrogeological model of ophiolite hard-rock aquifers in Oman based on a multiscale and a multidisciplinary approach |
title_sort |
conceptual hydrogeological model of ophiolite hard-rock aquifers in oman based on a multiscale and a multidisciplinary approach |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://brgm.hal.science/hal-03763638 https://doi.org/10.1007/s10040-005-0449-2 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
ISSN: 1431-2174 EISSN: 1435-0157 Hydrogeology Journal https://brgm.hal.science/hal-03763638 Hydrogeology Journal, 2005, 13 (5-6), pp.708-726. ⟨10.1007/s10040-005-0449-2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s10040-005-0449-2 hal-03763638 https://brgm.hal.science/hal-03763638 doi:10.1007/s10040-005-0449-2 |
op_doi |
https://doi.org/10.1007/s10040-005-0449-2 |
container_title |
Hydrogeology Journal |
container_volume |
13 |
container_issue |
5-6 |
container_start_page |
708 |
op_container_end_page |
726 |
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1799484105817063424 |