High-pressure Raman spectroscopic studies of ulvöspinel …
Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015-1305, U.S.A.
Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015-1305, U.S.A.
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Lunar thin section 12002. This low-Ti basalt is typical of the younger mare lavas. High-Ti lavas (9 to 13% TiO 2) are generally confined to the period 3.85 to 3.55 Ga, whereas the low-Ti lavas (1 to 5% TiO 2) are most common in the period 3.45-3.15 Ga (Meyer, 1987).This basalt is thought to have been derived from an olivine-pyroxene source rock at a depth of ~300 km.
Title: High-pressure Raman spectroscopic studies of ulvöspinel Fe2TiO4 Author: Atsushi Kyono Created Date: 7/24/2011 11:58:46 AM
Abstract Spinel single crystals (up to 4 mm in size) of eight compositions along the FeFe2O4-Fe2TiO4 solidsolution join, with more than 75 mol% ulvöspinel, were synthesized by use of a flux-growth method. The crystals were characterized by electron microprobe and Möss spectroscopy. Results demonstrated that these ulvöspinels are statistically …
Spinel single crystals (up to 4 mm in size) of eight compositions along the FeFe 2 O 4 -Fe 2 TiO 4 solidsolution join, with more than 75 mol% ulvöspinel, were synthesized by use of a flux-growth method. The crystals were characterized by electron microprobe and Möss spectroscopy. Results demonstrated that these ulvöspinels are statistically stoichiometric. The …
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Occurrence: A common component of titaniferous magnetite iron ores; in kimberlites; in strongly reduced iron-bearing basalts, terrestrial and lunar. Association: Iron, magnetite, troilite, …
Although it is an uncommon and poorly documented mineral, ulvöspinel, ulv, will be briefly discussed, as its recognition may be of interest due to its possible interference in the …
Triangular crystals of bright in BSE Ulvospinel are disseminated in dark-grey Anorthite matrix. Minor associating phases are intermediate between ulvospinel and feldspar in brightness …
Spinel single crystals of 19 compositions along the magnetite-ulvöspinel join were synthesized by use of a flux-growth method. To obtain quantitative site populations, the crystals were analyzed by single-crystal X-ray diffraction, electron-microprobe techniques, and …
The Ulvöspinel Subgroup is a subgroup of the Oxyspinel Group in the Spinel Supergroup, with tetravalent cations in the A site, and divalent in the D site.. A classification of spinel …
Lunar Thin Section 70017. This high-Ti basalt is typical of the older mare lavas. High-Ti lavas (9 to 13% TiO 2) are generally confined to the period 3.85 to 3.55 Ga, whereas the low-Ti lavas (1 to 5% TiO 2) are most common in the period 3.45-3.15 Ga (Meyer, 1987).The high-Ti basalts are thought to have been derived from olivine-pyroxene-ilmenite cumulates that formed during …
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Chromite occurs in this sample, suggesting it is one of the more primitive lavas. In the matrix, chromite is overgrown (partially replaced by?) ulvöspinel. In this image, the dark gray shades …
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Sample 12005,39. This is a crystal of ulvöspinel (pinkish region). During cooling the grain has exsolved thin lamellae of ilmenite (brighter) and spinel (medium-gray).
Spinel single crystals (up to 4 mm in size) of eight compositions along the FeFe 2 O 4-Fe 2 TiO 4 solid-solution join, with more than 75 mol% ulvöspinel, were synthesized by use of a flux-growth method. The crystals were characterized by electron microprobe and …
1194 KYONO ET AL.: HIGH-PRESSURE RAMAN SPECTROSCOPIC STUDIES OF ULVÖSPINEL Raman spectroscopy of ulvöspinel. Wang et al. (2004) have systematically studied the Raman spectra of Fe-Ti-Cr-oxides and
Ulvöspinel-Qandilite Series. An oxyspinel that commonly occurs as an exsolution product, forming a fine network along {100} in magnetite, or in ilmenite.
Abstract Spinel single crystals of 19 compositions along the magnetite-ulvöspinel join were synthesized by use of a flux-growth method. To obtain quantitative site populations, the crystals were analyzed by single-crystal X-ray diffraction, electron-microprobe techniques, and Möss spectroscopy. All results were processed by using an optimization model. The unit-cell …
The thermodynamics of mixing and its dependence on cation distribution in the Fe3O4–Fe2TiO4 (magnetite-ulvöspinel) spinel solid solution were studied using high-temperature oxide melt solution ...
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Traditionally, spinel, spn, was considered as the type species (MgAl 2 O 4) of the Spinel Group (AE 2 O 4), composed of three isomorphic series of cubic oxides whose composition can vary widely: spinel series (E = Al 3+), magnetite series (E = Fe 3+) and chromite series (E = Cr 3+), in which A represents the divalent cation (Fe, Mg, Mn, Zn).). However, according to a …
Title: Thermodynamics of the magnetite-ulvöspinel (Fe3O4-Fe2TiO4) solid solution Author: Kristina I. Lilova Created Date: 7/24/2012 4:00:41 PM
Despite these previous efforts, however, there is scant data on the geochemical behaviour of Fe–Ti oxides in magmatic systems (Nakamura et al., 1986, Green and Pearson, 1987, Piccoli et al., 2000).This is surprising, as iron–titanium oxides are known to incorporate relatively high concentrations of the high field strength elements (HFSE: Zr, Hf, Nb, Ta) and …
General Ulvospinel Information : Chemical Formula: TiFe++2O4 : Composition: Molecular Weight = 223.57 gm Titanium 21.42 % Ti 35.73 % TiO 2: Iron 49.96 % Fe 64.27 % FeO: Oxygen 28.63 % O: 100.00 % 100.00 % = TOTAL OXIDE
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