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Hydroxyl in diopside of diamond-free ultrahigh-pressure dolomitic marble from the Kokchetav Massif, Kazakhstan

Minoru Kikuchi and Yoshihide Ogasawara
Hydroxyl in diopside of diamond-free ultrahigh-pressure dolomitic marble from the Kokchetav Massif, Kazakhstan (in Ultrahigh-pressure metamorphism; deep continental subduction, Bradley R. Hacker (editor), William C. McClelland (editor) and Juhn G. Liou (editor))
Special Paper - Geological Society of America (2006) 403: 139-145

Abstract

Hydroxyl (OH) content in diopside of one diamond-free ultrahigh-pressure (UHP) marble from the Kokchetav Massif, Kazakhstan, was estimated by a micro-Fourier transform infrared (FTIR) spectrometer. Two intrinsic diopside OH bands of FTIR absorption spectra were identified at 3645 and 3465 cm (super -1) , with the former band dominating the spectra. Another band occurred at 3685 cm (super -1) , which seemed to be accompanied by trivial bands at 3750, 3730, 3585, and 3565 cm (super -1) . Intensity variation of the 3685 cm (super -1) band within a single diopside crystal and its location may suggest that the cause of this band was submicroscopic amphibole lamellae. The OH concentration of diopside was estimated to be no less than 850 ppm by weight. Using the previously published experimental data, this OH content indicates that diopside formed at pressures >5 GPa and in a high water activity (aH (sub 2) O) environment.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 403
Title: Hydroxyl in diopside of diamond-free ultrahigh-pressure dolomitic marble from the Kokchetav Massif, Kazakhstan
Title: Ultrahigh-pressure metamorphism; deep continental subduction
Author(s): Kikuchi, MinoruOgasawara, Yoshihide
Author(s): Hacker, Bradley R.editor
Author(s): McClelland, William C.editor
Author(s): Liou, Juhn G.editor
Affiliation: Waseda University, Department of Earth Sciences, Tokyo, Japan
Affiliation: University of California Santa Barbara, Geological Sciences Institute for Crustal Studies, Santa Barbara, CA, United States
Pages: 139-145
Published: 2006
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 34
Accession Number: 2006-069360
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N52°45'00" - N53°15'00", E68°30'00" - E70°19'60"
Secondary Affiliation: University of Idaho, USA, United StatesStanford University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200640
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