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Experimental evidence for fluid-induced melting in subduction zones

G. Rustioni1,

1Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany

A. Audétat1,

1Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany

H. Keppler1

1Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Rustioni, G., Audétat, A., Keppler, H. (2019) Experimental evidence for fluid-induced melting in subduction zones. Geochem. Persp. Let. 11, 49–54.

DFG, International Research Training Group “Deep Earth Volatile Cycles”, GRK 2156/1.

Geochemical Perspectives Letters v11  |  doi: 10.7185/geochemlet.1925
Received 07 June 2019  |  Accepted 28 August 2019  |  Published 22 October 2019
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Figure 1 Run products from high pressure experiments. (a) Cross section of a sample capsule after an experiment (image width 5 mm). A white layer of diamond powder is sandwiched between the silicate sample. The red arrow points to a laser ablation trace. (b) Backscatter electron image of the silicate part of a sample, consisting mostly of omphacite (Omp) and garnet (Grt) with minor kyanite (Ky) and rutile (Rt). In the centre of some garnet crystals, remnants of the garnet seeds are visible. (c) Laser ablation analysis of frozen fluid in the diamond trap, demonstrating the homogeneity of the sample.
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Figure 2 Effect of chloride on fluid/eclogite partition coefficients of trace elements at 4 GPa and 800 ˚C. Blue data points are the results from “forward” experiments, where the trace elements were initially doped into the solid starting material, while orange data points are from “reversed” experiments, which started with all trace elements dissolved in the fluid. For the forward experiments, results for different initial trace element concentrations in the starting material are given. Error bars are one standard deviation. Data for these and additional elements are given in Tables S-1 to S-8.
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Figure 3 Comparison of the fluid/eclogite partition coefficients for Cl-free fluids measured in this study with those reported by Kessel et al. (2005)

Kessel, R., Schmidt, M.W., Ulmer, P., Pettke, T. (2005) Trace element signature of subduction-zone fluids, melts and supercritical liquids at 120–180 km depth. Nature 437, 724–727.

. Both sets of experiments were carried out at 4 GPa and 800 ˚C, with a bulk composition resembling MORB.
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Figure 4 Trace element enrichment patterns in fluids from fluid/eclogite partitioning experiments at 4 GPa and 800 ˚C. Error bars are one standard deviation. Data for these and additional elements are given in Tables S-1 to S-8.
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