DETECTION OF HIGH‐PRESSURE SILICA POLYMORPHS IN WHOLE‐ROCK SAMPLES FROM A METEOR CRATER, ARIZONA, IMPACT SAMPLE USING SOLID‐STATE SILICON‐29 NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY
作者:
Wang‐Hong Yang,
R. James Kirkpatrick,
Norma Vergo,
John McHone,
Tryggvi I. Emilsson,
Eric Oldfield,
期刊:
Meteoritics
(WILEY Available online 1986)
卷期:
Volume 21,
issue 1
页码: 117-124
ISSN:0026-1114
年代: 1986
DOI:10.1111/j.1945-5100.1986.tb01230.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
High‐resolution solid‐state silicon‐29 nuclear magnetic resonance spectroscopy using “magic‐angle” sample‐spinning can readily detect the presence of the high pressure silica polymorphs coesite and stishovite in whole‐rock samples from a Meteor Crater, Arizona, impact sample, and yields accurate coesite/stishovite ratios. Such determinations are being carried out by partially suppressing (saturating) intense quartz signals (which have long spin‐lattice relaxation times) by means of short experimental recycle‐times. This method enhances the signal‐to‐noise ratios of coesite and stishovite (which have relatively short spin‐lattice relaxation times). For the sample examined, the coesite/sti
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