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Dislocation imaging for orthopyroxene using an atom-resolved scanning transmission electron microscopy.

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Dislocations in orthopyroxene (Opx) were studied using advanced scanning transmission electron microscopy (STEM). Two stacking fault types and calcium accumulation were identified, advancing understanding of silicate deformation mechanisms.

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Area of Science:

  • Mineral Physics and Geology
  • Materials Science
  • Geodynamics

Background:

  • Dislocations, as one-dimensional lattice defects in silicate minerals, are crucial to understanding the ductile deformation of Earth's crust.
  • Previous models of orthopyroxene ({100}<001>) slip systems involving partial dislocations and clinopyroxene (Cpx) stacking faults require atomic-level validation.
  • Complex silicate structures have historically hindered detailed atomic-scale analysis of dislocation cores.

Purpose of the Study:

  • To elucidate the atomic structure of dislocations in orthopyroxene (Opx) using advanced microscopy techniques.
  • To identify and characterize stacking faults and associated elemental distributions within deformed Opx.
  • To provide atomic-level insights into the ductile deformation mechanisms of silicate minerals.

Main Methods:

  • Utilized scanning transmission electron microscopy (STEM) with simultaneous high-angle annular dark field (HAADF) and annular bright field (ABF) imaging for atomic resolution.
  • Employed focused ion beam (FIB) techniques for sample preparation, enabling successive analysis from light microscopy to atom-resolved STEM.
  • Conducted energy-dispersive X-ray spectroscopy (EDS) analysis to determine elemental distribution around dislocations and stacking faults.

Main Results:

  • Identified two types of stacking faults, with clinopyroxene (Cpx) and protopyroxene (Ppx) structures, located between three partial dislocations in Opx.
  • Detected significant calcium (Ca) accumulation in M2 (Fe) sites surrounding the stacking faults.
  • Observed that Ca distribution extended beyond the stacking faults into the surrounding Opx matrix.

Conclusions:

  • The study provides direct atomic-scale evidence for the dissociation of Opx dislocations and the formation of Cpx and Ppx stacking faults.
  • The observed Ca enrichment suggests a role for impurities in influencing dislocation behavior and deformation mechanisms in silicates.
  • Advanced STEM techniques are powerful tools for resolving complex atomic structures and chemical variations in geological materials.