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The high temperature behavior of trace hydrous components in silicate minerals

Aines, Roger D. and Rossman, George R. (1985) The high temperature behavior of trace hydrous components in silicate minerals. American Mineralogist, 70 (11-12). pp. 1169-1179. ISSN 0003-004X. http://resolver.caltech.edu/CaltechAUTHORS:20130514-114605184

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Abstract

We have studied the high temperature behavior of water and hydroxide in quartz, feldspar, topaz, zircon, muscovite, cordierite, and beryl using high temperature infrared spectroscopy. We have directly observed processes such as dehydration and changes in hydrogen speciation. In some minerals trace hydroxyl and water speciation and properties at temperatures of geologic interest can be dramatically different from those at 25°C. In muscovite, no changes in speciation occur prior to dehydration at 750°C, whereas in topaz hydroxyl sites interconvert at 500 °C. In metamict zircon strongly hydrogen-bonded hydroxyl is preferentially lost from a continuum of sites during continuous dehydration occurring from 400° to 900°C. There are only minor changes in the O-H region spectrum of natural quartz at the ɑ-β transition point. In feldspar one type of molecular water is lost at ~200°C, and at 600° to 800° a second water type converts irreversibly to a new hydrous species. Changes at high temperature common to the infrared absorption bands of all minerals studied are: broadening, a shift to lower wave numbers, and a slight decrease in integral intensity. Temperature coefficients for 0-H stretching peak shifts range from 0 to -0.045 cm^(-1)/°C. Lattice modes also broaden and shift to lower wave numbers, typically with temperature coefficients of about -0.03 cm-^(-1)/°C.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://ammin.geoscienceworld.org/content/70/11-12/1169.citationPublisherUNSPECIFIED
ORCID:
AuthorORCID
Rossman, George R.0000-0002-4571-6884
Additional Information:© 1985 Mineralogical Society of America. Manuscript received, January 22, I985; accepted for publication, June 19, 1985. We would like to thank G. Cleve Solomon (Caltech) for his help, collaboration, and discussion on the problem of water in feldspar. Jim Woodhead and L. T. Silver (Caltech) provided similar assistance with zircon. The zircon experiment was run by Chris Finch, and the quartz experiment by Martin Ruzek, while they were undergraduate research assistants. Their help is gratefully acknowledged. This work was supported in part by National Science Foundation grants EAR-79-19987 and EAR-83-13098.
Funders:
Funding AgencyGrant Number
NSFEAR-79-19987
NSFEAR-83-13098
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Caltech Division of Geological and Planetary Sciences4174
Record Number:CaltechAUTHORS:20130514-114605184
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130514-114605184
Official Citation: Roger D. Aines and George R. Rossman The high temperature behavior of trace hydrous components in silicate minerals American Mineralogist, December 1985, v. 70, p. 1169-1179
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38498
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 May 2013 20:40
Last Modified:06 Feb 2017 21:23

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