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Title: Pressure-induced amorphization in plagioclase feldspars: A time-resolved powder diffraction study during rapid compression

Journal Article · · Earth and Planetary Science Letters
 [1];  [1];  [2];  [1];  [3];  [4];  [5];  [6];  [7];  [1];  [8]
  1. Stony Brook Univ., Stony Brook, NY (United States)
  2. Albert-Ludwig-Univ. Freiburg, Freiburg (Germany)
  3. Goethe-Univ. Frankfurt, Frankfurt (Germany)
  4. Friedrich-Schiller-Univ. Jena, Jena (Germany)
  5. Carnegie Institution of Washington, Argonne, IL (United States)
  6. European XFEL GmbH, Schenefeld (Germany)
  7. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  8. 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 Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
SC0012704; NA0001974; FG02-99ER45775; AC02-06CH11357
OSTI ID:
1495010
Alternate ID(s):
OSTI ID: 1635864
Report Number(s):
BNL-211280-2019-JAAM
Journal Information:
Earth and Planetary Science Letters, Vol. 507, Issue C; ISSN 0012-821X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (11)

New dynamic diamond anvil cells for tera-pascal per second fast compression x-ray diffraction experiments journal June 2019
Polymorphism of feldspars above 10 GPa text January 2020
Partial amorphization of experimentally shocked plagioclase: A spectroscopic study journal March 2020
Partial Melting‐Induced Chemical Evolution in Shocked Crystalline and Amorphous Plagioclase From the Lunar Meteorite Mount DeWitt 12007 journal July 2019
High pressure phase transitions of paracelsian BaAl2Si2O8 journal September 2019
Low velocity impact, compression after impact and morphological studies on flax fiber reinforced with basalt powder filled composites journal January 2020
Shock‐induced phase transformation of anorthitic plagioclase in the eucrite meteorite Northwest Africa 2650 journal April 2019
Unconventional high-pressure Raman spectroscopy study of kinetic and peak pressure effects in plagioclase feldspars journal January 2020
High pressure phase transitions of paracelsian $BaAl_{2}Si_{2}O_{8}$ text January 2019
Polymorphism of feldspars above 10 GPa journal June 2020
New dynamic diamond anvil cells for tera-pascal per second fast compression x-ray diffraction experiments text January 2019

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