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Correlation between OH concentration and oxygen isotope diffusion rate in diopsides from the Adirondack Mountains, New York
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Elizabeth A. Johnson
,
George R. Rossman
Published/Copyright:
March 28, 2015
Abstract
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 H2O by weight. The OH concentration in diopside increases monotonically with increasing fH2O 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 M3+ and Ti4+ 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 Fe3+/Fe2+ of 0.98, compared to Fe3+/Fe2+ (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
Received: 2001-8-17
Accepted: 2002-2-2
Published Online: 2015-3-28
Published in Print: 2002-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- Determination of molar absorptivities for infrared absorption bands of H2O in andesitic glasses
- H2O activity in H2O-N2 fluids at high pressure and temperature measured by the brucitepericlase equilibrium
- Kinetics of iron oxidation-reduction in hydrous silicic melts
- Kinetics of cation ordering in synthetic MgAl2O4 spinel
- Structural properties and heat-induced oxidation-dehydrogenation of manganoan ilvaite from Perda Niedda mine, Sardinia, Italy
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