Skip to Main content Skip to Navigation
Theses

Les mécanismes rédox contrôlant la chimie du carbone dans les fluides de l'anchi-métamorphisme : composition des paléofluides, géochimie isotopique, cristallochimie des minéraux phylliteux dans la partie externe des Alpes Centrales (Suisse)

Abstract : This works characterizes the mechanisms at which occurs the transition between CH4- and H2O- dominated fluid zone in the anchi-metamorphic rocks of the External part of Central Alps, Switzerland. Fluid inclusion trapped in fibre quartz during crack-and-seal mechanism record increasing metamorphic conditions during Alpine orogene. The end of the CH4-zone is characterized by a marked increase of CO2 at 270 +-5°C. The decrease of CH4 and CO2 in the H2O-zone is contemporaneous with presence of calcite, totally filling Alpine fissures. Isotopic fractionation (delta13C) between methane and calcite is in agreement with homogenisation temperatures of fluid inclusion. deltaD(H2O) and delta13C(CO2) values of fluid inclusions at the end of the CH4-zone characterise methane oxidation. In agreement with Mössbauer spectroscopy and EELS analyses, neoformation of chlorite and muscovite from detrital biotite is considered as the Fe-reduction driving force of the oxidation of fluid.
Document type :
Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_2005_0163_TARANTOLA.pdf
Complete list of metadata

https://hal.univ-lorraine.fr/tel-01746645
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 10:41:49 AM
Last modification on : Wednesday, November 4, 2020 - 1:56:02 PM

Identifiers

  • HAL Id : tel-01746645, version 1

Collections

Citation

Alexandre Tarantola. Les mécanismes rédox contrôlant la chimie du carbone dans les fluides de l'anchi-métamorphisme : composition des paléofluides, géochimie isotopique, cristallochimie des minéraux phylliteux dans la partie externe des Alpes Centrales (Suisse). Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10163⟩. ⟨tel-01746645⟩

Share

Metrics

Record views

20