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An experimental approach to quantify the effect of tetrahedral boron in tourmaline on the boron isotope fractionation between tourmaline and fluid

  • Martin Kutzschbach EMAIL logo , Bernd Wunder , Robert B. Trumbull , Alexander Rocholl , Anette Meixner and Wilhelm Heinrich
Published/Copyright: November 30, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 12

Abstract

This study investigates the effect of tetrahedral B ([4]B) in synthetic tourmaline on the B-isotope fractionation between tourmaline and fluid. This is important for the correct interpretation of B-isotope variations in natural tourmalines containing “excess” B (greater than three atoms per formula unit), which substitutes for Si at tetrahedral sites. Such tourmalines commonly occur in Li, Al-rich pegmatites and have been reported from glaucophane schists that formed at high pressures during subduction.

Tourmaline synthesis experiments were performed in a piston-cylinder apparatus in the system SiO2-Al2O3-B2O3-NaCl-H2O at 4 GPa and 700 °C using different run durations, starting from quartz-γ-Al2O3-H3BO3 solid mixtures and NaCl-solutions. We were able to produce “olenitic” tourmaline with excess B between 1.2 and 2.5 [4]B per formula unit. The B-isotope compositions of the olenitic tourmaline and coexisting fluids were determined by secondary ion mass spectrometry and multi-collector plasma source mass spectrometry to derive isotope fractionation coefficients. The results indicate that for every 10 mol% of total B in tourmaline in tetrahedral coordination, the value of Δ11Btur-fluid is shifted to more negative values by about 1‰ at 700 °C. This is in good agreement with published ab initio calculations and corresponds to an intracrystalline fractionation of B-isotopes between the trigonal B and tetrahedral T sites of tourmaline on the order of 8 ± 5‰, whereby 10B partitions to the T site.

Keywords: SIMS; experimental geochemistry; fluid; matrix effect; mass spectrometry

Acknowledgments

F. Couffignal is acknowledged for his support during SIMS analyses. The authors thank U. Dittmann for sample preparation, H.-P. Nabein for help with the XRD analysis and O. Appelt for support during the EMP measurement. DFG founding granted to G. Franz (TU Berlin) and W. Heinrich (GFZ Potsdam) (FR 557/31-1; HE 2015/16-1) is gratefully acknowledged. A. Meixner acknowledges support from the DFG Major Research Instrumentation Program INST 144/308-1. The quality of the manuscript benefitted a lot from the helpful comments of Horst Marschall and Edward Grew.

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Received: 2017-3-2
Accepted: 2017-8-30
Published Online: 2017-11-30
Published in Print: 2017-12-20

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2017-6127
Keywords for this article
SIMS; experimental geochemistry; fluid; matrix effect; mass spectrometry

Articles in the same Issue

  1. Special Collection: Rates and Depths of Magma Ascent on Earth
  2. Multiple-reaction geobarometry for olivine-bearing igneous rocks
  3. Special Collection: Rates and Depths of Magma Ascent on Earth
  4. Eruption style and crystal size distributions: Crystallization of groundmass nanolites in the 2011 Shinmoedake eruption
  5. Special Collection: Nanominerals and Mineral Nanoparticles
  6. The nanocrystalline structure of basaluminite, an aluminum hydroxide sulfate from acid mine drainage
  8. Trace element zoning in hornblende: Tracking and modeling the crystallization of a calc-alkaline arc pluton
  10. Toward the wider application of 29Si NMR spectroscopy to paramagnetic transition metal silicate minerals: Copper(II) silicates
  12. Extraterrestrial formation of oldhamite and portlandite through thermal metamorphism of calcite in the Sutter’s Mill carbonaceous chondrite
  14. Age discordance and mineralogy
  16. Melting relations in the system CaCO3-MgCO3 at 6 GPa
  18. Electrical conductivity of mudstone (before and after dehydration at high P-T) and a test of high conductivity layers in the crust
  20. The solubility of CePO4 monazite and YPO4 xenotime in KCl-H2O fluids at 800 °C and 1.0 GPa: Implications for REE transport in high-grade crustal fluids
  22. Mineralogical, geochemical, and textural indicators of crystal accumulation in the Adamello Batholith (Northern Italy)
  24. Stability field of the Cl-rich scapolite marialite
  26. The equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry
  28. An experimental approach to quantify the effect of tetrahedral boron in tourmaline on the boron isotope fractionation between tourmaline and fluid
  30. A qualitative and quantitative investigation of partitioning and local structure of arsenate in barite lattice during coprecipitation of barium, sulfate, and arsenate
  32. The origin of needle-like rutile inclusions in natural gem corundum: A combined EPMA, LA-ICP-MS, and nano-SIMS investigation—Discussion
  34. The origin of needle-like rutile inclusions in natural gem corundum: A combined EMPA, LA-ICP-MS, and nano-SIMS investigation—Reply
  36. New Mineral Names
  37. Errata
  38. Raman spectroscopy of water-rich stishovite and dense high-pressure silica up to 55 GPa
  39. Errata
  40. A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones
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