Analysis of hydrogen isotope ratios by SIMS, and application to determining mineral-fluid isotope fractionation factors

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Due to the large mass difference between the two isotopes, D/H ratios can be strongly affected by chemical processes. Thus, they can be sensitive monitors of fluid source, temperature, and fluid-rock interactions in geologic settings. The lack of confidence in fractionation factors has significantly hindered realization of the potential of D/H ratios in geochemical studies. The authors describe a new experimental method, relying on SIMS analysis, that allows the precise determination of mineral-water D/H fractionation factors, and the analytical considerations that are required to make both precise and accurate measurements. The development of this method is based on the fact ... continued below

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6 p.

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Riciputi, L.R.; Chacko, T.; Cole, D.R. & Horita, J. September 1, 1997.

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Description

Due to the large mass difference between the two isotopes, D/H ratios can be strongly affected by chemical processes. Thus, they can be sensitive monitors of fluid source, temperature, and fluid-rock interactions in geologic settings. The lack of confidence in fractionation factors has significantly hindered realization of the potential of D/H ratios in geochemical studies. The authors describe a new experimental method, relying on SIMS analysis, that allows the precise determination of mineral-water D/H fractionation factors, and the analytical considerations that are required to make both precise and accurate measurements. The development of this method is based on the fact that diffusion rates are markedly anisotropic in many hydrous minerals, varying by over five orders of magnitude depending on the crystallographic orientation. The diffusion rates can be determined by conducting controlled exchange experiments of fixed duration using isotopically labeled waters that are enriched (strongly) with D, and then measuring the depth profile by SIMS.

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6 p.

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OSTI as DE97008558

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  • International conference on secondary ion mass spectrometry, Orlando, FL (United States), 7-12 Sep 1997

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  • Other: DE97008558
  • Report No.: CONF-970933--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 650091
  • Archival Resource Key: ark:/67531/metadc710286

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  • September 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 21, 2016, 3:24 p.m.

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Riciputi, L.R.; Chacko, T.; Cole, D.R. & Horita, J. Analysis of hydrogen isotope ratios by SIMS, and application to determining mineral-fluid isotope fractionation factors, article, September 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc710286/: accessed May 28, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.