Significance of H2 and CO release during thermal treatment of natural phyllosilicate-rich rocks
| Autor: | Benoît Quesnel, Michel Cathelineau, Eric C. Gaucher, Thomas Rigaudier, Marie-Christine Boiron, Arkadiusz Derkowski, Malgorzata Lempart-Drozd, Laurent Truche |
|---|---|
| Přispěvatelé: | GeoRessources, Institut national des sciences de l'Univers (INSU - CNRS)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), 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 Grenoble Alpes (UGA)-Université Gustave Eiffel-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Polska Akademia Nauk = Polish Academy of Sciences (PAN), Centre de Recherches Pétrographiques et Géochimiques (CRPG), Université de Lorraine (UL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), TOTAL-Scientific and Technical Center Jean Féger (CSTJF), TOTAL FINA ELF, 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)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Centre scientifique et Technique Jean Feger (CSTJF) |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
natural hydrogen
Hydrogen chemistry.chemical_element [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Fractionation Thermal treatment 010501 environmental sciences 010502 geochemistry & geophysics Talc 01 natural sciences Geochemical cycle chemistry.chemical_compound Geochemistry and Petrology medicine Dehydrogenation Chlorite 0105 earth and related environmental sciences Isotope analysis talc Highlights hydrogen isotope Geology chemistry chlorite 13. Climate action dehydrogenation Environmental chemistry medicine.drug |
| Zdroj: | Chemical Geology Chemical Geology, 2022, 588, pp.120647. ⟨10.1016/j.chemgeo.2021.120647⟩ |
| ISSN: | 0009-2541 |
| DOI: | 10.1016/j.chemgeo.2021.120647⟩ |
| Popis: | International audience; Phyllosilicates may trap hydrogen (H2) in the crust, but they may also produce it through various processes, including oxidative dehydrogenation. The dehydrogenation temperature depends on the type and composition of the phyllosilicates considered, but it may be as low as 300 °C. Here, we document the release of H2 and CO during thermal treatment of chloritite (300 °C) and talc (500 °C) from the Trimouns deposits (Eastern Pyrenees, France). Thermal release of gases coupled to stable isotope analysis has been used to recover and characterize H2 and CO, the two detected gases. Hydrogen content may be as high as 7 ppm with δDH2 values ranging from −258‰ to – 224‰ for sub-pure chloritite and − 140‰ for pure talc. CO content ranges between 3 ppm and 35.3 ppm with very homogeneous δ13CCO values between −27.6‰ and − 25.7‰. This study supports the idea that H2 was produced during experiments by dehydrogenation. The origin of CO remains enigmatic, but its carbon isotope composition suggests a link to the few amounts of graphite documented in chloritite and talc from the deposit. This work also reports extensive hydrogen isotope fractionation between H2 produced by dehydrogenation and both talc and chloritite. Dehydrogenation of phyllosilicates is a potential source term of H2 in numerous magmatic-hydrothermal settings and must thus be accounted for in the budget of the H2 geochemical cycle |
| Databáze: | OpenAIRE |
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