Publication
- Names
-
- Bruno Reynard
- Lucile Bezacier
- Razvan Caracas
- Title
- Serpentines, talc, chlorites, and their high-pressure phase transitions: a Raman spectroscopic study
- Abstract
- Raman spectra of magnesian phyllosilicates belonging to the serpentine, talc, and chlorite groups have been obtained at ambient conditions, and at high pressures and up to 200 °C in order to study high-pressure transformations in the 10 GPa range. The complex and distinct Raman spectra of these minerals allow straightforward identification, which may otherwise be difficult from optical microscopy. High-pressure measurements are in good agreement with DFT calculations for talc and lizardite. Pressure-induced displacive modifications are identified in lizardite and antigorite serpentines, and in chlorite at ~4, 7 and 8 GPa, respectively, while talc shows no transition up to ~11 GPa. At high temperature, the high-pressure distortions of serpentines shift to higher pressures. Given the stability limits of these minerals, and the natural range of P-T conditions, none of the high-pressure distortions observed at high pressure are likely to occur at depth in the Earth.
- Year
- 2015
- Journal
- Physics and Chemistry of Minerals
- Volume
- 42
- Number
- 8
- Pages
- 641
- Document type
- article
- Publication state
- published
- Doi
- 10.1007/s00269-015-0750-0
- Identifiers
-
- bibcode: Reynard2015
- Experiment/Spectra
-
- Normalized Raman spectrum of $(Mg,Fe^{2+})_3Si_2O_5(OH)_4$ antigorite acquired with a 532 nm laser
- Normalized Raman spectrum of $(Mg,Fe^{2+})_3Si_2O_5(OH)_4$ antigorite in the OH range acquired with a 532 nm laser
- Normalized Raman spectrum of $(Mg,Fe^{2+})_3Si_2O_5(OH)_4$ lizardite acquired with a 514 nm laser
- Normalized Raman spectrum of $(Mg,Fe^{2+})_3Si_2O_5(OH)_4$ lizardite acquired with a 514 nm laser