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High-temperature heat capacity of grossular (Ca~3~Al~2~Si~3~O~12~), enstatite (MgSiO~3~), and titanite (CaTiSiO~5~) by Laurent Thieblot; Christophe Tequi; Pascal Richet is a Earth and Planetary Sciences article available to read on EtoBox.

What is High-temperature heat capacity of grossular (Ca~3~Al~2~Si~3~O~12~), enstatite (MgSiO~3~), and titanite (CaTiSiO~5~) about?

We performed experiments at 3.0 GPa and 1530-1565 °C to investigate the effects of crystal composition on trace element partitioning between garnet and anhydrous silicate melt. Bulk compositions along the pyrope (Py: Mg 3 Al 2 Si 3 O 12 )-grossular (Gr: Ca 3 Al 2 Si 3 O 12 ) join, doped with a suite of trace elements (Li, B, K, Sc, Ti, Sr, Y, Zr, Nb, Cd, In, REE, Hf, Ta, Th, and U) produced homogeneous garnets, ranging in composition from Py 84 Gr 16 to Py 9 Gr 91 , in equilibrium with melt. Trace element partition coefficients (D-values), measured by SIMS, depend greatly on the Mg/ (Mg + Ca) of garnet. For example, from Py 84 to Py 9 , D La increases from 0.004 to 0.2, whereas D U increases from 0.029 to 0.42. These variations can be explained by the lattice strain model of Blundy and Wood (1994), which describes trace element partitioning of an element i in terms of the ionic radius of i (r i ), the size of the lattice site on which i partitions (r 0 ), the Young's modulus of the site (E), and the (theoretical) partition coefficient D 0 for an ion of radius r 0 . For trivalent cations substituting in the garnet X-site (Y, REE, Sc, and In), apparent values of r 0 fitted to our dat

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Author

Laurent Thieblot; Christophe Tequi; Pascal Richet

Publisher

Mineralogical Society of America; Walter de Gruyter GmbH (ISSN 0003-004X)

Published

1999

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)