Pressure-induced amorphization in plagioclase feldspars: A time-resolved powder diffraction study during rapid compression
Journal Article
·
· Earth and Planetary Science Letters
- Stony Brook Univ., Stony Brook, NY (United States)
- Albert-Ludwig-Univ. Freiburg, Freiburg (Germany)
- Goethe-Univ. Frankfurt, Frankfurt (Germany)
- Friedrich-Schiller-Univ. Jena, Jena (Germany)
- Carnegie Institution of Washington, Argonne, IL (United States)
- European XFEL GmbH, Schenefeld (Germany)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Stony Brook Univ., Stony Brook, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
The pressure-induced amorphization of the two endmembers of the plagioclase ((Na1–xCax)Al1+xSi3–xO8) solid-solution, anorthite (CaAl2Si2O8) and albite (NaAlSi3O8), has been studied as a function of compression rate by means of time-resolved powder diffraction. Anorthite and albite were compressed in a diamond anvil cell to 80 GPa at multiple rates from 0.05 GPa/s to 80 GPa/s. The amorphization pressure decreases with increasing compression rate. This negative strain rate sensitivity indicates a change in deformation mechanism in the plagioclase solid-solution endmembers from brittle to ductile with increasing compression rate. The presented data support the previously proposed shear deformation mechanism for the amorphization of plagioclase. Furthermore, amorphization progresses over a wide pressure range suggesting heterogeneous amorphization, similar to observations based on recovered material from shock-compression experiments of plagioclase. As a result, our experiments support the contention that amorphization pressures for plagioclase may occur at lower pressures than usually considered.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357; FG02-99ER45775; NA0001974; SC0012704
- OSTI ID:
- 1495010
- Alternate ID(s):
- OSTI ID: 1635864
OSTI ID: 1493773
- Report Number(s):
- BNL--211280-2019-JAAM
- Journal Information:
- Earth and Planetary Science Letters, Journal Name: Earth and Planetary Science Letters Journal Issue: C Vol. 507; ISSN 0012-821X
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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