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Mineralogical Magazine; April 2006; v. 70; no. 2; p. 219-229; DOI: 10.1180/0026461067020325
© 2006 Mineralogical Society of Great Britain and Ireland
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Water-related IR characteristics in natural fibrous diamonds

D. A. Zedgenizov1, A. A. Shiryaev2,*, V. S. Shatsky1 and H. Kagi3

1 Institute of Mineralogy and Petrography of SB RAS, pr. Koptyuga 3, 630090, Novosibirsk, Russia
2 Institute of Crystallography of RAS, Leninsky pr. 59, 119333, Moscow, Russia
3 Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan

* E-mail: shiryaev{at}ns.crys.ras.ru

Water-related features were studied using infrared absorption spectroscopy in fibrous diamonds with micro-inclusions. Both OH-stretching and HOH-bending vibrations were observed. The lack of correlation between the intensities of HOH and OH bands in different samples and the complexity of the OH-stretching band indicate that a large fraction of water is present as hydroxyl groups in minerals.

Heating and cooling experiments were performed to elucidate the properties of fluids in micro-inclusions in diamonds. The results of experiments at various temperatures support the presence of several water-related components in individual diamonds. These spectroscopic investigations of fibrous diamonds revealed two or more interrelated water-related components preserved in micro-inclusions. The existence of several water phases or water solutions with different salinity and solutes within one diamond crystal is possible.

KEYWORDS: diamond, fluid inclusions, supercritical water, vibrational spectroscopy






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