The effect of TiO2on Pd, Ni, and Fe solubilities in silicate melts
-
Alexander Borisov
,
Yann Lahaye
Abstract
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.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- A zero-damage model for fission-track annealing in zircon
- Unoccupied states of pyrite probed by electron energy-loss spectroscopy (EELS)
- Tugtupite: High-temperature structures obtained from in situ synchrotron diffraction and Rietveld refinements
- SIMS microanalyses for Au in silicates
- Geochemistry of oxide minerals of Nb, Ta, Sn, and Sb in the Varuträsk granitic pegmatite, Sweden: The case of an “anomalous” columbite-tantalite trend
- An X-ray and electron microprobe study of Fe, Ni, Ga, and Ge distribution and local structure in a section of the Canyon Diablo iron meteorite
- Mineralogical approaches to fundamental crystal dissolution kinetics
- Cu L3X-ray absorption spectroscopy and the electronic structure of minerals: Spectral variations in non-stoichiometric bornites, Cu5FeS4
- A new nondestructive X-ray method for the determination of the 3D mineralogy at the micrometer scale
- Dissolution rates and pit morphologies of rhombohedral carbonate minerals
- The effect of TiO2on Pd, Ni, and Fe solubilities in silicate melts
- X-ray absorption spectroscopic study of Fe reference compounds for the analysis of natural sediments
- A survey of hydrous species and concentrations in igneous feldspars
- Structure and crystallization behavior of the (Ba,Sr)HAsO4·H2O solid-solution in aqueous environments
- The crystal structure of painite CaZrB[Al9O18] revisited
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- Mn-rich fluorapatite from Austria: Crystal structure, chemical analysis, and spectroscopic investigations
- Isothermal equation of state and compressional behavior of tetragonal edingtonite
- Synthesis and crystal-chemistry of Na(NaMg)Mg5Si8O22(OH)2, a P21/m amphibole
- A single-crystal study on the pressure behavior of phlogopite and petrological implications
- Quantitative electron microprobe analysis of Fe3+/ΣFe: Basic concepts and experimental protocol for glasses
