Identification of two distinct OH infrared ...
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Autre communication scientifique (congrès sans actes - poster - séminaire...): Communication dans un congrès sans actes
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Title :
Identification of two distinct OH infrared signatures in pyroxenes from pyroxenite xenoliths
Author(s) :
Ingrin, Jannick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Azevedo-Vannson, Samantha [Auteur]
Centre de Recherches Pétrographiques et Géochimiques [CRPG]
France, Lydéric [Auteur]
Centre de Recherches Pétrographiques et Géochimiques [CRPG]
Unité Matériaux et Transformations (UMET) - UMR 8207
Azevedo-Vannson, Samantha [Auteur]
Centre de Recherches Pétrographiques et Géochimiques [CRPG]
France, Lydéric [Auteur]
Centre de Recherches Pétrographiques et Géochimiques [CRPG]
Conference title :
EGU General Assembly 2019
City :
Vienne (Austria)
Country :
Autriche
Start date of the conference :
2019-04-07
HAL domain(s) :
Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
English abstract : [en]
Water concentration in pyroxenes from mantle xenoliths is generally used to trace the water content of lithospheric mantle. However, the infrared OH signatures recorded by pyroxenes provides also important information on ...
Show more >Water concentration in pyroxenes from mantle xenoliths is generally used to trace the water content of lithospheric mantle. However, the infrared OH signatures recorded by pyroxenes provides also important information on their previous equilibrium. We present results of infrared analyses of garnet pyroxenites xenoliths, two from the French Massif Central (Devès, FMC) and two from Cameroon (Youkou Maar, Adamaou, Africa). The FMC pyroxenites have low water content and present dominant OH bands at 3595, 3517 cm−1 and 3571, 3517 cm−1 for cpx and opx, respectively. The pyroxenites from Cameroon have high water content and have dominant bands at 3635, 3445 cm−1 and 3602, 3417 cm−1 for cpx and opx. Like for OH spectra from peridotite xenoliths from Nógrád-Gömör (Hungary), it was possible to isolate two distinct end-member spectra in pyroxenes (Patkó et al. 2019). Spectra signatures of cpx and opx are correlated, showing that they have both recorded the same events. The two end-members spectra clearly point out for two distinct spectral signatures related to distinct OH defects configurations. The pyroxenites from FMC have crystallized at higher temperature than those of Cameroon (1050°C versus 950°C; France et al. 2015). These results suggest that the FMC pyroxenites have also crystallized in drier conditions than the ones from Cameroon or have experienced dry metasomatism after their crystallization. References France, L. et al. (2015) Mantle refertilization and magmatism in old orogenic regions: The role of late-orogenic pyroxenites. Lithos, 232, 49-75. Patkó L. et al. (2019) Extremely low structural hydroxyl contents in upper mantle xenoliths from the Nógrád-Gömör volcanic field (northern Pannonian Basin): Geodynamic implications and the role of post-eruptive re-equilibration. Chemical Geology, https://doi.org/10.1016/j.chemgeo2018.12.017.Show less >
Show more >Water concentration in pyroxenes from mantle xenoliths is generally used to trace the water content of lithospheric mantle. However, the infrared OH signatures recorded by pyroxenes provides also important information on their previous equilibrium. We present results of infrared analyses of garnet pyroxenites xenoliths, two from the French Massif Central (Devès, FMC) and two from Cameroon (Youkou Maar, Adamaou, Africa). The FMC pyroxenites have low water content and present dominant OH bands at 3595, 3517 cm−1 and 3571, 3517 cm−1 for cpx and opx, respectively. The pyroxenites from Cameroon have high water content and have dominant bands at 3635, 3445 cm−1 and 3602, 3417 cm−1 for cpx and opx. Like for OH spectra from peridotite xenoliths from Nógrád-Gömör (Hungary), it was possible to isolate two distinct end-member spectra in pyroxenes (Patkó et al. 2019). Spectra signatures of cpx and opx are correlated, showing that they have both recorded the same events. The two end-members spectra clearly point out for two distinct spectral signatures related to distinct OH defects configurations. The pyroxenites from FMC have crystallized at higher temperature than those of Cameroon (1050°C versus 950°C; France et al. 2015). These results suggest that the FMC pyroxenites have also crystallized in drier conditions than the ones from Cameroon or have experienced dry metasomatism after their crystallization. References France, L. et al. (2015) Mantle refertilization and magmatism in old orogenic regions: The role of late-orogenic pyroxenites. Lithos, 232, 49-75. Patkó L. et al. (2019) Extremely low structural hydroxyl contents in upper mantle xenoliths from the Nógrád-Gömör volcanic field (northern Pannonian Basin): Geodynamic implications and the role of post-eruptive re-equilibration. Chemical Geology, https://doi.org/10.1016/j.chemgeo2018.12.017.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
INRAE
ENSCL
CNRS
INRAE
ENSCL
Collections :
Research team(s) :
Matériaux Terrestres et Planétaires
Submission date :
2023-09-07T14:53:17Z
2023-09-07T17:55:31Z
2023-09-07T17:55:31Z
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