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American Mineralogist; April 2004; v. 89; no. 4; p. 564-571
© 2004 Mineralogical Society of America
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The effect of TiO2 on Pd, Ni, and Fe solubilities in silicate melts

Alexander Borisov1,3,*, Yann Lahaye2 and Herbert Palme3

1 Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry Russian Academy of Sciences, Staromonetny 35, 109017 Moscow, Russia
2 J.W. Goethe-Universität, Institut für Mineralogie (Abt. Petrologie und Geochemie), Senckenberganlage 28, 60054 Frankfurt, Germany
3 Universität zu Köln, Institut für Mineralogie und Geochemie, Zülpicher Strasse 49b, 50674 Köln, Germany

Correspondence: * E-mail: aborisov{at}igem.ru

We have determined Pd, Ni, and Fe solubilities in silicate melts of anorthite-diopside eutectic composition with variable TiO2 concentrations, from TiO2-free melts to melts with up to 26 wt% TiO2. The experiments were conducted with metal loops at 1300 °C, one atm total pressure, and at a wide range of oxygen fugacities. The glasses were analyzed with the electron microprobe and by laser ablation inductively coupled plasma mass spectrometry (LA ICP-MS).

The behavior of Ni was found to be nonlinear. At given T-fO2 conditions, its solubility is relatively constant for melts with up to about 4 wt% (3 mol%) TiO2. At higher TiO2 concentrations, Ni solubility increases strongly with TiO2 contents. The results obtained for Pd at oxidizing conditions are similar to those obtained for Ni. The solubility of Fe increases uniformly with TiO2 contents within the whole TiO2 concentration range.

In some experiments Pd-containing alloy micronuggets were encountered. In this case analyses were done in areas free of nuggets. Experiments in which the nugget density was too high were discarded. The regular behavior of Pd—even in nugget-containing silicates—indicates that Pd-oxide solubility and nugget formation are independent processes.

The occurrence of Ti-rich phases (karrooite and armalcolite) on the liquidus of TiO2-saturated melts at reducing conditions, and the Pd partition coefficients between rutile and silicate melts, were determined and are briefly discussed.




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A. Borisov, Y. Lahaye, and H. Palme
The effect of sodium on the solubilities of metals in silicate melts
American Mineralogist, May 1, 2006; 91(5-6): 762 - 771.
[Abstract] [Full Text] [PDF]


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