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Hydroxyl contents of accessory minerals in mantle eclogites and related rocks

Rossman, George R. and Smyth, Joseph R. (1990) Hydroxyl contents of accessory minerals in mantle eclogites and related rocks. American Mineralogist, 75 (7-8). pp. 775-780. ISSN 0003-004X.

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Infrared spectra in the region 3000 to 3800 cm^(-1) have been measured on coesite, kyanite, sanidine, and rutile occurring in inclusions of eclogite, and on garnet and spinel in an inclusion of alkremite from South African kimberites. Coesite and sanidine contain virtually no H_2O or OH, although one sanidine crystal was observed to contain abundant H2O, apparently as fluid inclusions of molecular H2O. Kyanite contains significant OH, consistent with previous results for similar samples. Corundum gives no indication of the presence of H_2O or OH. Rutile containing significant amounts of Fe, Cr, Al, and Nb also contains significant amounts of structural OH. Garnet in alkremite contains small amounts of molecular H_2O, whereas the spinel coexisting with this garnet gives no indication of H_2O or OH, indicating that the spinel structure is not able to accommodate significant amounts of OH. Ammonium contents of all samples were less than the detection limit (about 10 ppm).

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1990 Mineralogical Society of America. Manuscript received August 9, 1989; manuscript accepted May 23, 1990. This study was funded in part by NSF grants EAR-8618200 to GRR and EAR-8709224 and EAR-8904164 to JRS. The authors thank Dr. J.J. Gurney ofthe University of Cape Town and Dr. J.B. Hawthorne of DeBeers Consolidated Mines, Ltd., Kimberley for samples. They also thank Dr. T C. McCormick (University of Colorado), Professor Roger Bums (Massachusetts Institute of Technology), and Professor William D. Carlson (University of Texas) for constructive reviews of the manuscript.
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Issue or Number:7-8
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ID Code:38038
Deposited By: Jason Perez
Deposited On:19 Apr 2013 20:44
Last Modified:26 Nov 2019 11:15

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