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REE and Hf distribution between pyrope and NaCl-bearing water at eclogitic-facies conditions

Celine Martin, Fabrice Brunet, Stephanie Duchene, Beatrice Luais and Etienne Deloule
REE and Hf distribution between pyrope and NaCl-bearing water at eclogitic-facies conditions (in EMPG XII Toulouse; Experimental mineralogy, petrology and geochemistry symposium, Jannick Ingrin (editor) and Mike Toplis (editor))
European Journal of Mineralogy (June 2011) 23 (3): 343-353


Due to the interaction of oceanic crust with seawater, NaCl is a main component dissolved in aqueous fluid in subduction zones. The effect of dissolved NaCl (1.64 mol/l) on the partitioning of REE and Hf between garnet (pyrope) and aqueous fluid (doped with approximately 500 ppm of REE and approximately 250 ppm of Hf) has been investigated experimentally at 3 GPa, 850 degrees C (i.e., eclogitic UHP conditions) using the diamond trap technique. Trace elements in both pyrope and diamond aggregate were analyzed using LA-ICP-MS to derive fluid/pyrope partition coefficients (D). Mass balance calculation indicates that lanthanum is present in an accessory phase, tornebohmite. Europium and aluminium concentrations are too high in the aggregate to comply with mass balance and solubility data from the literature, respectively. Transport of these species from the mineral powder to the aggregate is inferred. D (sub MREE) (Gd and Tb) equals 0.39+ or -0.11 and 0.22+ or -0.07, respectively. D (sub HREE) (Dy to Lu) ranges from 0.09+ or -0.02 to 0.02+ or -0.01 with a regular decrease from Dy to Lu. D (sub Hf) is 0.33+ or -0.09. Lanthanum is found to be incompatible (D (sub La) is 2.10+ or -0.95) whereas for the other LREE (from Ce to Sm), D is lower than 1 (D (sub Ce) =0.65+ or -0.15, D (sub Pr) =0.74+ or -0.22, D (sub Nd) =0.71+ or -0.29 and D (sub Sm) =0.61+ or -0.23). Contrary to D (sub HREE) and D (sub MREE) , D (sub LREE) do not fit a near-parabolic dependence on LREE effective ionic radius. The Hf fluid/pyrope partition coefficient (D (sub Hf) =0.33+ or -0.09) indicates that this element favourably partition into garnet. Finally, it is shown that, compared to pure water, the addition of NaCl in water has no significant effect on REE and Hf behaviour.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 23
Serial Issue: 3
Title: REE and Hf distribution between pyrope and NaCl-bearing water at eclogitic-facies conditions
Title: EMPG XII Toulouse; Experimental mineralogy, petrology and geochemistry symposium
Author(s): Martin, CelineBrunet, FabriceDuchene, StephanieLuais, BeatriceDeloule, Etienne
Author(s): Ingrin, Jannickeditor
Author(s): Toplis, Mikeeditor
Affiliation: Nancy-Universite, Centre de Recherches Petrographiques et Geochimiques, Vandoeuvre les Nancy, France
Affiliation: Paul Sabatier University, Toulouse, France
Pages: 343-353
Published: 201106
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
Meeting name: Twelfth international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Toulouse, FRA, France
Meeting date: 20100411April 11-14, 2010
References: 47
Accession Number: 2011-064938
Categories: General geochemistryIgneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
Secondary Affiliation: Ecole Normale Superieure, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201136
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