Experimental boron isotope fractionation between tourmaline and fluid: confirmation from in situ analyses by secondary ion mass spectrometry and from Rayleigh fractionation modelling |
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Authors: | Horst R Marschall Christian Meyer Bernd Wunder Thomas Ludwig Wilhelm Heinrich |
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Institution: | 1.Department of Earth Sciences,University of Bristol,Bristol,UK;2.Department 3, Section 3.3,GeoForschungsZentrum Potsdam,Potsdam,Germany;3.Institut für Geologische Wissenschaften,Freie Universit?t Berlin,Berlin,Germany;4.Institut für Geowissenschaften,Universit?t Heidelberg,Heidelberg,Germany |
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Abstract: | Tourmaline synthesised in an experiment with low boron excess was analysed in situ by secondary ion mass spectrometry. It
revealed significant B isotope zonation with 11B/10B ratios increasing in the growth direction of the crystals. Trend, magnitude and absolute values strongly support results
from high-B-excess isotope fractionation experiments. Furthermore, the closed system B-isotopic evolution of the experimental
fluid was modelled by Rayleigh fractionation. The model results are in excellent agreement with the measured B-isotope composition
of the run-product fluid. Consequently, low-element-excess experiments are proposed as an ideal approach to determine fluid-solid
isotope fractionation factors for systems that are characterised by Rayleigh fractionation. |
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