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Hydrogen, lithium, and boron in mantle-derived olivine: The role of coupled substitutions

Kent, Adam J. R. and Rossman, George R. (2002) Hydrogen, lithium, and boron in mantle-derived olivine: The role of coupled substitutions. American Mineralogist, 87 (10). pp. 1432-1436. ISSN 0003-004X. doi:10.2138/am-2002-1020.

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We report major element, boron, lithium, and water (present as structurally bound hydroxyl) contents for a suite of ten mantle-derived olivine crystals, measured by electron microprobe, secondary ion mass spectrometry, and Fourier-transform infrared spectroscopy. Water measurements are based on re-analysis and/or re-processing of data previously reported in the literature. Analyzed olivines have lithium, boron, and water concentrations of 0.9–7.8 and 0.01–67, and 0.8–61 ppm (by weight), respectively. One olivine from Kingiti, Tanzania (possibly derived from metasomatized peridotite) is anomalous, with boron and lithium contents of 67 and 7.8 ppm, respectively. The remaining olivine samples have lithium and boron contents below 3 and 1 ppm, respectively. Although lithium, boron, and water contents vary substantially, their cation proportions are not strongly correlated, arguing against simple coupled substitutions involving these elements. Importantly, the incorporation of boron and water in olivine by the B(F,OH)Si_(−1)O_(−1) substitution does not appear to be a universal feature of mantle olivine, although it may be significant in those with the highest boron contents. Our data also support suggestions that olivine may be an important reservoir for hydrogen, lithium, and boron in the lithospheric and upper asthenospheric mantle, and may thus play a key role in the geochemical cycling of these elements within the mantle, and between the mantle and crust.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 2002 American Mineralogist. Manuscript received October 1, 2001. Manuscript accepted April 29, 2002. Manuscript handled by Thomas Duffy. J.R.K. was supported by Department of Energy Grant DEFG03-85ER13445 to E.M. Stolper (Caltech) at the time when this project began. Funding was provided by the National Science Foundation through grant EAR-9804871 to G.R.R. Aspects of this work were performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract W-7405-ENG-48. The assistance of L. Arredondo with data collection is gratefully acknowledged. Reviews by W.P. Leeman and E.S. Grew greatly improved this contribution. A.J.R.K. also acknowledges the support of the Danish Lithosphere Centre during the final stages of production of this manuscript. This is California Institute of Technology Division of Geological and Planetary Sciences contribution number 8851.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-85ER13445
Department of Energy (DOE)W-7405-Eng-48
Danish Lithosphere CentreUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences8851
Issue or Number:10
Record Number:CaltechAUTHORS:20130417-130154765
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Official Citation:Adam J.R. Kent and George R. Rossman Hydrogen, lithium, and boron in mantle-derived olivine: The role of coupled substitutions American Mineralogist, October, v. 87, p. 1432-1436
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37993
Deposited By: Ruth Sustaita
Deposited On:19 Apr 2013 19:28
Last Modified:09 Nov 2021 23:32

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