Diffusion of divalent cations in garnet: multi-couple experiments

We demonstrate the possibility of studying several diffusion couples in a single run, i.e. under almost similar P – T – t – conditions, allowing direct comparison of the diffusion rates in different diffusion couples. Thus the duration of experimental study and the risk of failure of expensive exper...

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Veröffentlicht in:Contributions to mineralogy and petrology 2009-05, Vol.157 (5), p.573-592
Hauptverfasser: Perchuk, A. L., Burchard, M., Schertl, H.-P., Maresch, W. V., Gerya, T. V., Bernhardt, H.-J., Vidal, O.
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container_end_page 592
container_issue 5
container_start_page 573
container_title Contributions to mineralogy and petrology
container_volume 157
creator Perchuk, A. L.
Burchard, M.
Schertl, H.-P.
Maresch, W. V.
Gerya, T. V.
Bernhardt, H.-J.
Vidal, O.
description We demonstrate the possibility of studying several diffusion couples in a single run, i.e. under almost similar P – T – t – conditions, allowing direct comparison of the diffusion rates in different diffusion couples. Thus the duration of experimental study and the risk of failure of expensive experimental equipment can be decreased considerably. The diffusion experiments were carried out in piston-cylinder apparatus. Gem-quality garnets of almandine, spessartine and grossular compositions together with inclusion-rich eclogitic garnets were embedded in a powder of natural pyrope and annealed together under dry conditions at P  = 1.9–3.2 GPa and T  = 1,070–1,400°C. Diffusion profiles were measured by electron microprobe and fitted numerically on the basis of multicomponent diffusion theory. The datasets derived from different diffusion couples yields parameters of the Arrhenius equation for Ca, Mg and Fe in natural eclogitic garnets and Mg, Mn and Fe in gem-quality garnets. We have also studied the effect of grain-boundary diffusion in the sintered pyrope matrix on interdiffusion on the basis of 2D modeling. Under conditions analogous to those of our experimental runs, we show that observed irregularities in some measured diffusion profiles (not applied for the diffusion modeling) can be directly related to the superposition of local grain-boundary diffusion on dominant volume diffusion.
doi_str_mv 10.1007/s00410-008-0353-6
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subjects Cations
Earth and Environmental Science
Earth Sciences
Geology
Mineral Resources
Mineralogy
Original Paper
Petrology
Sciences of the Universe
title Diffusion of divalent cations in garnet: multi-couple experiments
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