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Title: Phase transitions of α-quartz at elevated temperatures under dynamic compression using a membrane-driven diamond anvil cell: Clues to impact cratering?

Coesite and stishovite are high-pressure silica polymorphs known to have been formed at several terrestrial impact structures. They have been used to assess pressure and temperature conditions that deviate from equilibrium formation conditions. Here in this paper, we investigate the effects of nonhydrostatic, dynamic stresses on the formation of high-pressure polymorphs and the amorphization of α-quartz at elevated temperatures. The obtained disequilibrium states are compared with those predicted by phase diagrams derived from static experiments under equilibrium conditions. We analyzed phase transformations starting with α-quartz in situ under dynamic loading utilizing a membrane-driven diamond anvil cell. Using synchrotron powder X-ray diffraction, the phase transitions of SiO 2 are identified up to 77.2 GPa and temperatures of 1160 K at compression rates ranging between 0.10 and 0.37 GPa s -1. Coesite starts forming above 760 K in the pressure range between 2 and 11 GPa. At 1000 K, coesite starts to transform to stishovite. This phase transition is not completed at 1160 K in the same pressure range. Therefore, the temperature initiates the phase transition from α-quartz to coesite, and the transition from coesite to stishovite. Below 1000 K and during compression, α-quartz becomes amorphous and partially converts to stishovite. Thismore » phase transition occurs between 25 and 35 GPa. Above 1000 K, no amorphization of α-quartz is observed. High temperature experiments reveal the strong thermal dependence of the formation of coesite and stishovite under nonhydrostatic and disequilibrium conditions.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [5]
  1. Albert-Ludwigs Univ., Freiburg (Germany). Inst. für Geo- und Umweltnaturwissenschaften, and Inst. für Geo- und Umweltnaturwissenschaften, Kristallographie
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  3. Stony Brook Univ., NY (United States). Mineral Physics Inst.
  4. Albert-Ludwigs Univ., Freiburg (Germany). Inst. für Geo- und Umweltnaturwissenschaften, Kristallographie
  5. Albert-Ludwigs Univ., Freiburg (Germany). Inst. für Geo- und Umweltnaturwissenschaften
Publication Date:
Report Number(s):
BNL-209422-2018-JAAM
Journal ID: ISSN 1086-9379
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Meteoritics and Planetary Science
Additional Journal Information:
Journal Volume: 53; Journal Issue: 8; Journal ID: ISSN 1086-9379
Publisher:
Wiley
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; quartz; X-ray diffraction; high pressure; high temperature
OSTI Identifier:
1480922

Carl, Eva-Regine, Liermann, Hanns-Peter, Ehm, Lars, Danilewsky, Andreas, and Kenkmann, Thomas. Phase transitions of α-quartz at elevated temperatures under dynamic compression using a membrane-driven diamond anvil cell: Clues to impact cratering?. United States: N. p., Web. doi:10.1111/maps.13077.
Carl, Eva-Regine, Liermann, Hanns-Peter, Ehm, Lars, Danilewsky, Andreas, & Kenkmann, Thomas. Phase transitions of α-quartz at elevated temperatures under dynamic compression using a membrane-driven diamond anvil cell: Clues to impact cratering?. United States. doi:10.1111/maps.13077.
Carl, Eva-Regine, Liermann, Hanns-Peter, Ehm, Lars, Danilewsky, Andreas, and Kenkmann, Thomas. 2018. "Phase transitions of α-quartz at elevated temperatures under dynamic compression using a membrane-driven diamond anvil cell: Clues to impact cratering?". United States. doi:10.1111/maps.13077. https://www.osti.gov/servlets/purl/1480922.
@article{osti_1480922,
title = {Phase transitions of α-quartz at elevated temperatures under dynamic compression using a membrane-driven diamond anvil cell: Clues to impact cratering?},
author = {Carl, Eva-Regine and Liermann, Hanns-Peter and Ehm, Lars and Danilewsky, Andreas and Kenkmann, Thomas},
abstractNote = {Coesite and stishovite are high-pressure silica polymorphs known to have been formed at several terrestrial impact structures. They have been used to assess pressure and temperature conditions that deviate from equilibrium formation conditions. Here in this paper, we investigate the effects of nonhydrostatic, dynamic stresses on the formation of high-pressure polymorphs and the amorphization of α-quartz at elevated temperatures. The obtained disequilibrium states are compared with those predicted by phase diagrams derived from static experiments under equilibrium conditions. We analyzed phase transformations starting with α-quartz in situ under dynamic loading utilizing a membrane-driven diamond anvil cell. Using synchrotron powder X-ray diffraction, the phase transitions of SiO2 are identified up to 77.2 GPa and temperatures of 1160 K at compression rates ranging between 0.10 and 0.37 GPa s-1. Coesite starts forming above 760 K in the pressure range between 2 and 11 GPa. At 1000 K, coesite starts to transform to stishovite. This phase transition is not completed at 1160 K in the same pressure range. Therefore, the temperature initiates the phase transition from α-quartz to coesite, and the transition from coesite to stishovite. Below 1000 K and during compression, α-quartz becomes amorphous and partially converts to stishovite. This phase transition occurs between 25 and 35 GPa. Above 1000 K, no amorphization of α-quartz is observed. High temperature experiments reveal the strong thermal dependence of the formation of coesite and stishovite under nonhydrostatic and disequilibrium conditions.},
doi = {10.1111/maps.13077},
journal = {Meteoritics and Planetary Science},
number = 8,
volume = 53,
place = {United States},
year = {2018},
month = {4}
}