Titre :

A quest for the water content of the lithospheric mantle: What are the challenges and opportunities?

Auteur(s) :

Ingrin, Jannick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207

Titre de la manifestation scientifique :

HiPeR Seminars

Organisateur(s) de la manifestation scientifique :

Hiroshima University

Ville :

Hiroshima

Pays :

Japon

Date de début de la manifestation scientifique :

2024-03-29

Mot(s)-clé(s) en anglais :

hydrogen
infrared spectroscopy
mantle xenoliths

Discipline(s) HAL :

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

Résumé en anglais : [en]

Knowledge of the water distribution in mantle lithosphere is important to model the evolution of cratons over time and the inner Earth water cycle. Attempts to estimate deep lithosphere water content from ‘water’ in nominally ...
Lire la suite >Knowledge of the water distribution in mantle lithosphere is important to model the evolution of cratons over time and the inner Earth water cycle. Attempts to estimate deep lithosphere water content from ‘water’ in nominally anhydrous minerals (NAM) from mantle xenoliths has been extensively used in the past. However, the ability of xenoliths to preserve water signatures from deep lithosphere has never been fully demonstrated. In the first part of the talk, I will address this question through examples from several natural case studies from the French Massif Central. The case studies will be used to demonstrate the limits of the approach, showing that water recorded does not necessarily represent mantle water content. In the second part, I will show that mantle xenoliths have not all the same infrared spectral signatures. The coexisting of different infrared spectral signatures, which have not been erased during degassing, are the true signatures preserved from depth. I will demonstrate that distinct geodynamical contexts are associated with distinct spectral signatures, and distinct signatures may exist within a single geodynamical context. It opens perspectives to use them to study water lithosphere heterogeneities.Lire moins >

Langue :

Anglais

Comité de lecture :

Non

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Matériaux Terrestres et Planétaires

Date de dépôt :

2024-03-29T22:20:38Z
2024-04-04T15:41:57Z
2024-04-22T08:59:34Z
2024-04-25T07:18:36Z