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Physics and Chemistry of Minerals

, Volume 25, Issue 5, pp 313–317 | Cite as

29Si MAS NMR relaxation study of shocked Coconino Sandstone from Meteor Crater, Arizona

  • S. A. Myers
  • R. T. Cygan
  • R. A. Assink
  • M. B. Boslough
ORIGINAL PAPER

Abstract

29Si nuclear magnetic resonance (NMR) spectroscopy was used to characterize the silica phases in a moderately-shocked Coconino sandstone from Meteor Crater, Arizona. The spectra were recorded using direct polarization, magic-angle spinning, and variable delay times in a saturation recovery pulse sequence. Resonances observed at -97.3, -107.1, -113.9 and -191.2 ppm were assigned to a densified hydrous form of amorphous silica (D phase), quartz, coesite and stishovite phases, respectively. The relative percentages were estimated as 1.7, 80.6, 16.4 and 1.3% for the D, quartz, coesite, and stishovite phases. The power-law recoveries of the magnetization for the quartz and coesite phases can be interpreted in terms of their phase geometries.

Keywords

Quartz Nuclear Magnetic Resonance Sandstone Relative Percentage Variable Delay Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • S. A. Myers
    • 1
  • R. T. Cygan
    • 2
  • R. A. Assink
    • 1
  • M. B. Boslough
    • 1
  1. 1.Sandia National Laboratories, Albuquerque, NM 87185, USAUS
  2. 2.Geochemistry Department, Sandia National Laboratories, Albuquerque, NM 87185-0750; Phone: 505-844-7216 (office); Fax: 505-844-7216; E-mail: rtcygan@sandia.gov

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