Publication
- Names
-
- S. Farsang
- S. Facq
- S. A. T. Redfern
- Title
- Raman modes of carbonate minerals as pressure and temperature gauges up to 6 GPa and 500 °C
- Abstract
- carbon speciation at subduction zones require pressure monitoring with sensitive, chemically inert sensors. Commonly used pressure indicators are either too insensitive or prone to contaminate pressure-transmitting media due to their increased solubility at high pressure and/or temperature (P-T). Here, the P- and T-induced frequency shifts of the Raman vibrational modes of natural crystalline carbonate minerals aragonite, calcite, dolomite, magnesite, rhodochrosite, and siderite have been calibrated for application as Raman spectroscopic P and T sensors in DACs up to 500 °C and 6 GPa. The shifts of all modes are quasi-constant over the observed P and T ranges and are generally less prominent for internal modes than for external modes. Our method provides a sensitive and robust alternative to traditional pressure calibrants, and has three principal advantages: (1) higher sensitivity (for particular Raman vibrational modes), (2) monitoring P-T-induced shifts of several modes allows even more accurate P-T determination, and (3) no contamination of pressure-transmitting media by foreign materials can occur. Additionally, the isobaric and isothermal equivalent of the Grüneisen parameter and the anharmonic parameter for each of the traced modes have been determined.
- Keywords
- Raman spectroscopy, band list, diamond-anvil cell, high pressure, high temperature, minerals, carbonates, aragonite, calcite, dolomite, magnesite, rhodochrosite, siderite
- Content
- band list data, spectral data
- Year
- 2018
- Journal
- American Mineralogist
- Volume
- 103
- Pages
- 1988 - 1998
- Pages number
- 11
- Document type
- article
- Publication state
- published