Preprints
https://doi.org/10.5194/egusphere-2023-100
https://doi.org/10.5194/egusphere-2023-100
08 Feb 2023
 | 08 Feb 2023

Quartz under stress: Raman calibration and applications to geobarometry of metamorphic inclusions

Bruno Reynard and Xin Zhong

Abstract. An experimental calibration of the three major Raman peaks of quartz with hydrostatic pressure and uniaxial differential stress is presented, and implications for their use in geobarometry based on Raman spectroscopy of quartz inclusions is discussed. The position of the 206 cm−1 peak depends only on hydrostatic pressure P, and its pressure dependence is recalibrated with a peak fitting procedure that is more adequate for Raman barometry than previous calibrations. The position of the 128 and 464 cm−1 peaks depends on P and also on differential stress σ, which can be determined from the position of these two peaks knowing hydrostatic pressure from the position of the 206 cm−1 peak. The results obtained here are different from those inferred previously from first-principles calculations. The present calibration provides direct relationships between Raman shifts and stress, with a simple formulation of residual pressure and differential stress assuming uniaxial stress along the c-axis of quartz inclusions. It is tested on data from experimental and natural inclusions. Residual pressures from the present calibration are similar within uncertainties to those obtained with previous experimental calibration within uncertainties, and experimental inclusions yield residual pressures consistent with synthesis pressure. Inconsistent residual differential stresses are obtained from the 128 and 464 cm−1 peaks on some experimental inclusions, providing a criterion for identifying inclusions under complex stress conditions that are not appropriate for geobarometry. Recent data on natural inclusions show self-consistent differential stress, consistent with the assumption of major stress along symmetry axis of the inclusion crystals and with values expected from elastic models. The average pressure values from the 128 and 464 cm−1 peaks is similar to the residual pressure from the 206 cm−1 peak that depends only on hydrostatic pressure. It can be used to obtain pressure when the 206 cm−1 peak position cannot be used due to interference with host mineral peaks. Using the 128 and 464 cm−1 peaks alone, or averaging either 128 and 206 or 206 and 464 cm−1 peaks can induce systematic bias in the residual pressure determination. Applications of the present results to natural inclusions suggest that combined determination of residual pressure and differential stress may be used both for barometry and thermometry pending further calibration.

Journal article(s) based on this preprint

12 Jun 2023
Quartz under stress: Raman calibration and applications of metamorphic inclusions to geobarometry
Bruno Reynard and Xin Zhong
Solid Earth, 14, 591–602, https://doi.org/10.5194/se-14-591-2023,https://doi.org/10.5194/se-14-591-2023, 2023
Short summary

Bruno Reynard and Xin Zhong

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-100', Andrey Korsakov, 14 Mar 2023
    • AC1: 'Reply on RC1', Bruno Reynard, 20 Apr 2023
  • RC2: 'Comment on egusphere-2023-100', Anonymous Referee #2, 14 Mar 2023
    • AC2: 'Reply on RC2', Bruno Reynard, 20 Apr 2023
  • CC1: 'Comment on egusphere-2023-100', Ross Angel, 15 Mar 2023
    • AC3: 'Reply on CC1', Bruno Reynard, 20 Apr 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-100', Andrey Korsakov, 14 Mar 2023
    • AC1: 'Reply on RC1', Bruno Reynard, 20 Apr 2023
  • RC2: 'Comment on egusphere-2023-100', Anonymous Referee #2, 14 Mar 2023
    • AC2: 'Reply on RC2', Bruno Reynard, 20 Apr 2023
  • CC1: 'Comment on egusphere-2023-100', Ross Angel, 15 Mar 2023
    • AC3: 'Reply on CC1', Bruno Reynard, 20 Apr 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Bruno Reynard on behalf of the Authors (21 Apr 2023)  Author's response   Author's tracked changes   Manuscript 
EF by Polina Shvedko (21 Apr 2023)  Supplement 
ED: Publish as is (09 May 2023) by Andrea Di Muro
ED: Publish as is (09 May 2023) by Andrea Di Muro(Executive editor)
AR by Bruno Reynard on behalf of the Authors (11 May 2023)

Journal article(s) based on this preprint

12 Jun 2023
Quartz under stress: Raman calibration and applications of metamorphic inclusions to geobarometry
Bruno Reynard and Xin Zhong
Solid Earth, 14, 591–602, https://doi.org/10.5194/se-14-591-2023,https://doi.org/10.5194/se-14-591-2023, 2023
Short summary

Bruno Reynard and Xin Zhong

Bruno Reynard and Xin Zhong

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Rocks are brought deep and back to the Earth's surface by the tectonic processes that form mountain ranges. Tiny mineral inclusions can record how deep rocks went. Quartz, a common mineral inclusion, was put in the laboratory at conditions that mimic those at depths to about 100 km. A laser-based spectroscopy (Raman) was calibrated to read pressure from quartz, and to unravel the deep travel of the rocks where quartz inclusions are found.