Computer Science
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.5233d&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 71, Issue 21, p. 5233-5243.
Computer Science
Scientific paper
Hydrogen deuterium exchange in tourmaline single crystals of elbaite composition from Nepal has been studied at 1 atm and at temperatures between 973 and 1073 K. H/D ratios were determined after each annealing experiment using micro FTIR-spectroscopy. Diffusion coefficients (10-16 10-15 m2 s-1) were determined by fitting the data using a 3D numerical simulation. The rate of diffusion is two to three times faster along the c direction than along directions parallel to the basal plane. The diffusion laws are, respectively: LogD=-9.8±1.0-106.3±36.82.3RT and LogD=-12.2±0.5-66.8±19.62.3RT, with D in m2 s-1, T in Kelvin and the activation energy in kJ mol-1. The diffusion rates are one order of magnitude faster, and have slightly lower activation energies, than those found by previous authors for schorlite (125 kJ mol-1). The closure temperature of hydrogen isotope exchange in the tourmaline-water system is lower for elbaite than for schorlite.
Desbois Guillaume
Ingrin Jannick
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