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Experimental insights on crystal chemistry of high-Ti garnets from garnet-melt partitioning of rare-earth and high-field-strength elements
-
Rachel E. Dwarzski
,
David S. Draper
Veröffentlicht/Copyright:
31. März 2015
Abstract
High-temperature experiments were performed from 3.0 to 7.0 GPa to investigate the effect of composition on near-liquidus garnet-melt trace-element partition coefficients (D-values) in a Ti- and Fe-rich lunar bulk composition. Starting compositions were doped with Sc, Sr, Y, Zr, Ba, Nd, Sm, Dy, Yb, Hf, and Th. D-values were measured by ion-microprobe analysis. The lattice strain model of Blundy and Wood (1994) was applied to measured D-values, and then compared with the predictive garnet-melt trace-element partitioning model of van Westrenen et al. (2001b). Although the latticestrain model describes our data adequately, there is a substantial mismatch between the prediction of the van Westrenen et al. (2001b) model and the actual measured D-values. We suggest crystal-chemical effects associated with the high Ti content of our experimental garnets may be responsible for this mismatch. Titanium alone does not appear to control partitioning; we infer that Fe2+ and/or Mg2+ are required to partition into octahedral coordination on the Y-site, which may further necessitate Si2+ to also partition on the Y-site for charge balance. This combination of effects influences trace-element partitioning in the garnet. Observed changes in D-values correlate with the integration of Ti on the Y-site in a majorite-like exchange, yet our garnets incorporate little or no majorite. Garnets grown have some of the lowest apparent Young.s modulus values (274.528 GPa) yet documented for the garnet X-site indicating higher compressiblities than previously inferred.
Keywords: Experimental petrology; high-pressure experiments; trace elements and REE; garnetmelt partitioning; major and minor elements; titanium; crystal chemistry
Received: 2005-9-21
Accepted: 2006-5-31
Published Online: 2015-3-31
Published in Print: 2006-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Experimental petrology;
high-pressure experiments;
trace elements and REE;
garnetmelt partitioning;
major and minor elements;
titanium;
crystal chemistry
Artikel in diesem Heft
- Orbicular oxides in carbonatitic kimberlites
- Fluid-mediated polymetamorphism related to Proterozoic collision of Archean Wyoming and Superior provinces in the Black Hills, South Dakota
- Lithium isotopic systematics of granites and pegmatites from the Black Hills, South Dakota
- Identifying the effects of petrologic processes in a closed basaltic system using trace- element concentrations in olivines and glasses: Implications for comparative planetology
- Tectonic implications of diverse igneous blocks in Franciscan mélange, Northern California and southwestern Oregon
- The petrogenesis of the Apollo 14 high-Al mare basalts
- Experimental insights on crystal chemistry of high-Ti garnets from garnet-melt partitioning of rare-earth and high-field-strength elements
- The atomic arrangement of merrillite from the Fra Mauro Formation, Apollo 14 lunar mission: The first structure of merrillite from the Moon
- The behavior of Li and B in lunar mare basalts during crystallization, shock, and thermal metamorphism: Implications for volatile element contents of martian basalts
- Pyroxene europium valence oxybarometer: Effects of pyroxene composition, melt composition, and crystallization kinetics
- Comparative planetary mineralogy: Pyroxene major- and minor-element chemistry and partitioning of vanadium between pyroxene and melt in planetary basalts
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- α-PbO2-type nanophase of TiO2 from coesite-bearing eclogite in the Dabie Mountains, China–Reply
- Rietveld structure refinement of perovskite and post-perovskite phases of NaMgF3 (Neighborite) at high pressures
- Letter. Si vacancies in the 10-Å phase
