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Correlation between OH concentration and oxygen isotope diffusion rate in diopsides from the Adirondack Mountains, New York

Johnson, Elizabeth A. and Rossman, George R. and Dyar, M. Darby and Valley, John W. (2002) Correlation between OH concentration and oxygen isotope diffusion rate in diopsides from the Adirondack Mountains, New York. American Mineralogist, 87 (7). pp. 899-908. ISSN 0003-004X.

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The concentration of structural OH in diopside was determined for four granulite facies siliceous marble samples from the Adirondack Mountains, New York, using FTIR spectroscopy. Single-crystal polarized IR spectra were measured on (100) and (010) sections of diopside. The relative intensities of four OH bands in the 3700–3200 cm^(–1) region vary among the samples, with the 3645 cm^(–1) band dominating the spectra of diopside from a xenolith at Cascade Slide. Total OH content in the diopsides ranges from 55 to 138 ppm H_(2)O by weight. The OH concentration in diopside increases monotonically with increasing f_H2O for the sample, as estimated using oxygen isotope systematics for diffusion rates in these samples from Edwards and Valley (1998). There is no significant variation in OH content within a single diopside grain or among diopside grains from the same hand sample. Charge-coupled substitution with M^3+ and Ti^4+ in the crystal structure may have allowed retention of OH in the diopside structure during and after peak metamorphism (~750 °C, 7–8 kbar). The Cascade Slide diopsides have an Fe^3+/Fe^2+ of 0.98, compared to Fe^3+/Fe^2+ (0 to 0.05) for the other samples, implying that some loss of hydrogen through oxidation of Fe was possible in this sample. This is the first study we know of which shows that the OH content in anhydrous minerals from natural samples correlates to the rate of oxygen isotope diffusion.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Dyar, M. Darby0000-0003-4272-793X
Additional Information:© 2002 Mineralogical Society of America. Manuscript received August 17, 2001; manuscript accepted February 2, 2002; manuscript handled by David R. Cole. The authors are grateful to Edwin Schauble for aid in revising the manuscript and Gunther Redhammer for help in interpretation of the Mössbauer spectra. We thank Henrik Skogby and an anonymous reviewer for helpful comments. This work was made possible by NSF grant EAR-9804871 to GRR and NASA grant NAG5-10424 to M.D.D.
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Issue or Number:7
Record Number:CaltechAUTHORS:20130415-154922564
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37953
Deposited By: Jason Perez
Deposited On:16 Apr 2013 14:50
Last Modified:09 Mar 2020 13:18

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