Low-temperature chlorite geothermometry: ...
Type de document :
Compte-rendu et recension critique d'ouvrage
URL permanente :
Titre :
Low-temperature chlorite geothermometry: a graphical representation based on a T-R2+-Si diagram
Auteur(s) :
Bourdelle, Franck [Auteur]
Laboratoire Génie Civil et Géo-Environnement [Béthune] [LGCgE]
Cathelineau, Michel [Auteur]
GeoRessources
Laboratoire Génie Civil et Géo-Environnement [Béthune] [LGCgE]
Cathelineau, Michel [Auteur]
GeoRessources
Titre de la revue :
European Journal of Mineralogy
Pagination :
617-626
Éditeur :
Copernicus
Date de publication :
2015-09
ISSN :
0935-1221
Mot(s)-clé(s) en anglais :
chlorite
geothermometry
diagenesis
low-grade metamorphism
solid solution model
geothermometry
diagenesis
low-grade metamorphism
solid solution model
Discipline(s) HAL :
Planète et Univers [physics]/Sciences de la Terre
Résumé en anglais : [en]
The chlorites are good indicators of rock history because their wide compositional variations are sensitive to the formation conditions, like pressure (P), temperature (T), redox state, fluid composition. Accordingly, many ...
Lire la suite >The chlorites are good indicators of rock history because their wide compositional variations are sensitive to the formation conditions, like pressure (P), temperature (T), redox state, fluid composition. Accordingly, many geothermometers based on their composition, either empirically or thermodynamically, have been proposed during the last 30 years, especially in low-temperature contexts (T < 350 degrees C). This paper presents a graphical tool that considerably facilitates the use of two of the most recent chlorite thermometers for low- and very-low-T chlorites. The temperature composition relationships for low-T chlorites are represented in T-R2+-Si diagrams, allowing chlorite compositions to be predicted as a function of temperature or, conversely, temperature to be estimated from compositional fields of natural chlorites. This graphical projection is based on a comparison of the parameters (ideal chlorite compositions and calculated 7) predicted by geothermometers with analyses of natural chlorites for which independent T estimates are available over a range of geological environments. The new T-R2+-Si diagram provides a practical tool for thermometric purposes in the applicability range of the considered models, in particular for diagenesis and low-grade metamorphism.Lire moins >
Lire la suite >The chlorites are good indicators of rock history because their wide compositional variations are sensitive to the formation conditions, like pressure (P), temperature (T), redox state, fluid composition. Accordingly, many geothermometers based on their composition, either empirically or thermodynamically, have been proposed during the last 30 years, especially in low-temperature contexts (T < 350 degrees C). This paper presents a graphical tool that considerably facilitates the use of two of the most recent chlorite thermometers for low- and very-low-T chlorites. The temperature composition relationships for low-T chlorites are represented in T-R2+-Si diagrams, allowing chlorite compositions to be predicted as a function of temperature or, conversely, temperature to be estimated from compositional fields of natural chlorites. This graphical projection is based on a comparison of the parameters (ideal chlorite compositions and calculated 7) predicted by geothermometers with analyses of natural chlorites for which independent T estimates are available over a range of geological environments. The new T-R2+-Si diagram provides a practical tool for thermometric purposes in the applicability range of the considered models, in particular for diagenesis and low-grade metamorphism.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :
Date de dépôt :
2023-12-20T12:47:48Z