Low-Temperature Chlorite Geothermometry and Related Recent Analytical Advances: A Review

Bourdelle, Franck

Document type :

Article dans une revue scientifique: Article original

DOI :

10.3390/min11020130

Title :

Low-Temperature Chlorite Geothermometry and Related Recent Analytical Advances: A Review

Author(s) :

Bourdelle, Franck [Auteur]

Laboratoire Géosciences et Environnement Cergy [GEC]
Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 [LGCgE]

Journal title :

Minerals

Pages :

130

Publisher :

MDPI

Publication date :

2021-01-28

ISSN :

2075-163X

HAL domain(s) :

Planète et Univers [physics]/Sciences de la Terre/Minéralogie

English abstract : [en]

Chlorite, a 2:1:1 phyllosilicate, has all the required attributes to form the basis of a geothermometer: this mineral is ubiquitous in metamorphic, diagenetic, and hydrothermal systems with a broad field of stability and ...
Show more >Chlorite, a 2:1:1 phyllosilicate, has all the required attributes to form the basis of a geothermometer: this mineral is ubiquitous in metamorphic, diagenetic, and hydrothermal systems with a broad field of stability and a chemical composition partly dependent on temperature (T) and pressure (P) conditions. These properties led to the development of a multitude of chlorite thermometers, ranging from those based on empirical calibrations (linking T to AlIV content) to thermodynamic or semi-empirical models (linking T to chlorite + quartz + water equilibrium constant). This present study provides an overview of these geothermometers proposed in the literature for low-temperature chlorite (T < 350 °C), specifying the advantages and limitations of each method. Recent analytical developments that allow for circumventing or responding to certain criticisms regarding the low-temperature application of thermometers are also presented. The emphasis is on micrometric and nanometric analysis, highlighting chemical intracrystalline zoning—which can be considered as evidence of a succession of local equilibria justifying a thermometric approach—and mapping ferric iron content. New perspectives in terms of analysis (e.g., Mn redox in Mn-chlorite) and geothermometer (molecular solid-solution model, oxychlorite end-member) are also addressed.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :