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Pressure-temperature studies of talc plus water using X-ray diffraction

Authors
Journal
American Mineralogist
0003-004X
Publisher
Mineralogical Society of America
Publication Date
Keywords
  • Talc
  • X-Ray Diffraction
  • High Pressure
  • Subduction
  • 10 Angstrom Phase
  • Single-Crystal
  • System Mgo-Sio2-H2O
  • Powder
  • Diffraction
  • State Measurements
  • 10-Angstrom Phase
  • Subduction Zones
  • Earths Mantle
  • Equation
  • Stability

Abstract

X-ray diffraction measurements of natural talc plus water at combined pressures and temperatures of 0-15 GPa and 23-400 degrees C reveal the presence of a structural change that could be interpreted as a new high-pressure phase at 4.0 (+/- 0.5) GPa, and raise the possibility that the newly inferred phase transition takes place in cold subducting stabs as a precursor to appearance of the 10 angstrom phase of talc.

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