Contribution of the Paragenetic Sequence of Clay Minerals to Re-Examination of the Alteration Zoning in the Krafla Geothermal System
Autor: | Patricia Patrier, Daniel Beaufort, David Escobedo, Annette Mortensen, Benoit Gibert, Léa Lévy, Nathaniel Findling |
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Přispěvatelé: | Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Université des Antilles (UA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Géologie, Ecole Normale Supérieure, Paris Sciences et Lettres, CNRS, Paris, France, Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-Institut de Chimie du CNRS (INC), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) |
Rok vydání: | 2021 |
Předmět: |
010504 meteorology & atmospheric sciences
Geochemistry [SDU.STU]Sciences of the Universe [physics]/Earth Sciences engineering.material 010502 geochemistry & geophysics 01 natural sciences Hydrothermal circulation chemistry.chemical_compound Kaolinite hydrothermal alteration geothermal systems Geothermal gradient Chlorite paragenetic model 0105 earth and related environmental sciences Mineral Geology Mineralogy Krafla Geotechnical Engineering and Engineering Geology clay minerals chemistry [SDU]Sciences of the Universe [physics] 13. Climate action Leaching (pedology) Illite engineering Clay minerals QE351-399.2 [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
Zdroj: | Minerals Minerals, MDPI, 2021, 11 (9), pp.935. ⟨10.3390/min11090935⟩ Volume 11 Issue 9 Minerals, Vol 11, Iss 935, p 935 (2021) Minerals, 2021, 11 (9), pp.935. ⟨10.3390/min11090935⟩ |
ISSN: | 2075-163X |
Popis: | International audience; This paper revisits the clay mineralogy of the “smectite” alteration zone in the Krafla geo-thermal field via the study of an exploratory well in which temperatures range from 40 °C to 215 °C. The clay alteration consists of several mineral assemblages superimposed in time and space, resulting from different stages of water-rock interaction. Trioctahedral clay minerals (chlorite, corrensite and smectite) are observed throughout the studied section. These minerals can form in nearly closed systems as replacements of groundmass minerals/glass after interactions with resident and nearly stagnant fluids not far from chemical equilibrium (neutral to basic pH conditions) or from direct precipitation from geothermal fluids. They are locally superimposed by Al clay phases (smectite, illite/smectite and kaolinite), which result from intense leaching of the host rocks due to their interaction with low pH fluids under strong W/R ratios. The absence of mineralogical zoning is explained by the fact that hydrothermal alteration is strongly dependent on very recent hydrodynamics. The current fluid circulation generates trioctahedral clays at depth that cannot be distinguished from pervasive earlier alteration. The only easily detectable signature of current activity and the most relevant signature for geothermal exploration is the presence of Al dioctahedral phases since it indicates leaching and intense hydrothermal activity. |
Databáze: | OpenAIRE |
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