Stishovite at the Cretaceous-Tertiary boundary, Raton, New Mexico

Details Stishovite at the Cretaceous-Tertiary boundary, Raton, New Mexico Stishovite at the Cretaceous-Tertiary boundary, Raton, New Mexico

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...243.1182m&link_type=abstract

Science (ISSN 0036-8075), vol. 243, March 3, 1989, p. 1182-1184. Research supported by R. S. Dietz and Barringer Crater Co.

Physics

25

Mineral Deposits, Silicon Dioxide, Stishovite, Nuclear Magnetic Resonance, Volcanoes, X Ray Analysis

Scientific paper

Solid-state Si-29 magic-angle spinning NMR and X-ray diffraction of samples from the Cretaceous-Tertiary boundary layer at Raton, New Mexico show that stishovite occurs in crystalline mineral grains. A single, sharp resonance with a chemical shift value of -191.3 ppm, which is characteristic of Si in octahedral coordination, disappeared after heating the sample at 850 C for 30 min. More than 120 peaks are observed in an X-ray diffraction pattern of HF residuals from the unheated sample. Most of these peaks correspond to quartz, zircon, rutile, and anatase. Eight unambiguous weak to moderate reflections are ascribed to d-spacings characteristic of stishovite.

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