Experimental determination of fractionation of 11B/10B between tourmaline and aqueous vapor; a temperature- and pressure-dependent isotopic system

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Authors:Palmer, M. R.; London, D.; Morgan, G. B., VI; Babb, H. A.
Author Affiliations:Primary:
Bristol Univ., Dep. Geol., Bristol, United Kingdom
Univ. Okla., United States
Washington Univ., United States
Volume Title:Frontiers in isotope geosciences
Volume Authors:Harmon, Russell S., editor; Hinton, Richard W.
Source:Chemical Geology; Isotope Geoscience Section, 101(1-2), p.123-129; Frontiers in isotope geosciences conference, Keyworth, United Kingdom, Jan. 3-4, 1991, edited by Russell S. Harmon and Richard W. Hinton. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0168-9622
Publication Date:1992
Note:In English. 16 refs.; illus. incl. 1 table
Summary:The extent of B isotope fractionation between tourmaline and aqueous vapour has been determined over the P-T range 50-200 MPa and 350-75z0 degrees C. The results show that the extent of fractionation is inversely dependent on T. An unusual feature of the reaction is that the isotope fractionation is less extensive at higher P for an equivalent T. Due to its refractory nature the experiments involved synthesis of tourmaline from constituents rather than equilibration of the performed mineral with an isotopically distinct aqueous phase. For this reason the present authors cannot, as yet, be certain whether the P effect is the result of equilibrium or kinetic processes. [Authors' abstract] [P.Br.]
Subjects:B-11/B-10; Boron; Experimental studies; Geochemistry; Isotopes; Minerals; P-T conditions; Ring silicates; Silicates; Stable isotopes; Synthetic materials; Tourmaline group; Water vapor; Fractionation
Abstract Numbers:93M/650
Record ID:1992037897
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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