Skip to Main content Skip to Navigation
Theses

Mobilisation des REE et de l'Hf par les fluides lors du métamorphisme HP-BT : Influence sur les datations Sm-Nd et Lu-Hf

Abstract : REE and Hf mobility in aqueous fluids during HP-BT metamorphism can disturb magmatic signatures of protoliths and Sm-Nd and Lu-Hf dating. This study performed on both natural samples from Vårdalsneset (WGR, Norway) and experimental estimates of REE and Hf partition coefficients between aqueous fluid with NaCl or CO2 and pyrope (P = 3 GPa, T = 800°C) highlights two main results. Firstly, REE can be mobilized at the sample scale (tens of centimetres) whereas Hf is only mobilized at the grain scale. Magmatic signatures of protoliths are nevertheless recognizable and Nd and Hf model ages are not disturbed, that suggests slight mobility of REE. Secondly, an aqueous fluid with CO2 induces an incompatible behaviour of HREE in pyrope, which can explain the depletion in HREE of the metabasites of Vårdalsneset in presence of a H2O-CO2 or CO2 fluid.
Document type :
Theses
Complete list of metadatas

Cited literature [251 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01748477
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 11:36:07 AM
Last modification on : Thursday, February 25, 2021 - 9:46:09 AM
Long-term archiving on: : Friday, September 14, 2018 - 9:41:23 AM

File

SCD_T_2009_0056_MARTIN.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01748477, version 1

Citation

Céline Martin. Mobilisation des REE et de l'Hf par les fluides lors du métamorphisme HP-BT : Influence sur les datations Sm-Nd et Lu-Hf. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10056⟩. ⟨tel-01748477⟩

Share

Metrics

Record views

56

Files downloads

87