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Shock metamorphism in plagioclase and selective amorphization.

Lidia Pittarello1,2, Luke Daly3,4,5, Annemarie E PickersgilL3

  • 1Department of Mineralogy and Petrography Natural History Museum Burgring 7 A-1010 Vienna Austria.

Meteoritics & Planetary Science
|October 1, 2020
PubMed
Summary
This summary is machine-generated.

Shock metamorphism in plagioclase feldspar begins with localized amorphization along specific crystallographic planes, particularly within pre-existing twins. This finding helps understand impact events and use plagioclase as a shock indicator.

Keywords:
amorphizationdeformation localizationelectron backscatter diffractionplagioclase feldsparplanar deformation featuresshock metamorphism

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Area of Science:

  • Geology
  • Mineralogy
  • Planetary Science

Background:

  • Plagioclase feldspar is a common mineral on Earth and terrestrial planets.
  • Hypervelocity impacts are ubiquitous, but plagioclase's response to shock metamorphism is poorly understood.
  • Understanding shock-induced amorphization in plagioclase is crucial for interpreting impact structures.

Purpose of the Study:

  • To investigate the initiation and progression of shock-induced amorphization in plagioclase.
  • To analyze shocked plagioclase grains using electron backscatter diffraction (EBSD).
  • To determine if plagioclase can serve as a shock indicator in impactites.

Main Methods:

  • Electron backscatter diffraction (EBSD) analysis.
  • Microstructural examination of shocked plagioclase grains.
  • Study of a metagranite shatter cone from the Manicouagan impact structure.

Main Results:

  • Shock amorphization in plagioclase initiates within pre-existing twins or along specific lamellae.
  • These amorphized lamellae exhibit periodicity similar to twins and planar deformation features (PDFs).
  • Preferential amorphization occurs along crystallographic orientations favorable for shock wave scattering.

Conclusions:

  • Shock amorphization in plagioclase is a localized process occurring along specific crystallographic planes.
  • The orientation of these planes dictates preferential structural failure under shock.
  • This supports a universal mechanism for PDF formation in silicate minerals and enhances plagioclase's potential as a shock indicator.