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Title: The solubility of titanite in silicate melt determined from growth and dissolution experiments

Journal Article · · Contributions to Mineralogy and Petrology
ORCiD logo [1];  [1];  [1];  [2];  [3];  [1];  [4]
  1. Vanderbilt Univ., Nashville, TN (United States)
  2. Rensselaer Polytechnic Inst., Troy, NY (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Smithsonian Institute, Washington, DC (United States)

The solubility of titanite (CaTiSiO5) in Si-rich melts was measured experimentally through growth experiments at 800–1000 °C, 0.5–1.0 GPa, log fO2 ~ CCO–0.8, t = 72–168 h, and H2O = 0 to 4 wt.%, and in dissolution experiments at 925–1300 °C, 0.8 GPa, t = 18–118 h, and H2O = 1–10 wt.% in a piston-cylinder apparatus. Run product glasses in growth experiments were homogeneous, and iron loss suppressed ilmenite crystallization. Saturation concentrations in dissolution experiments were estimated by fitting measured diffusion profiles. Titanite solubility increases with increasing temperature and melt composition parameter \(M = {\text{ molar }}\left( {{\text{Na }} + {\text{ K }} + {\text{ 2Ca}}} \right)/\left( {{\text{Al }} \times {\text{ Si}}} \right)\). Multiple linear regression of glass composition data from growth and dissolution experiments (n = 29) plus 39 experiments from the LEPR database (Hirschmann et al. 2008) yielded the titanite solubility equation (adj. r2 = 0.95): \(\left( {TiO_{2} } \right)^{melt} \left( {wt.\% } \right) = 0.978 \times M + 0.0048 \times T\left( K \right){-}5.90\). This model correctly predicted undersaturation in 95% of 2344 experiments from the LEPR database that did not have titanite or rutile. Application to natural rocks yields saturation temperatures that are similar to independent temperature estimates. Finally, this equation should be useful for constraining the temperatures of titanite-saturated melts, for determining whether titanite saturation in magmatic source regions is likely, and for determining when titanite can crystallize and begin to exert an influence on melt geochemistry.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
AC52-07NA27344; EAR-0911726
OSTI ID:
1861240
Report Number(s):
LLNL-JRNL-832622; 1050499
Journal Information:
Contributions to Mineralogy and Petrology, Vol. 177, Issue 3; ISSN 0010-7999
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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