Experimental investigation and application of the equilibrium rutile + orthopyroxene = quartz + ilmenite

Hayob, Jodie L.; Bohlen, Steven R.; Essene, Eric J.

doi:10.1007/bf00712975

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…The interaction parameters are either assessed in this work or are adopted from the assessment of other works (Saxena et al 1993, Fabrichnaya and Kuskov 1994, Kuskov 1995. In this work, we recalculated the interaction parameters for such solid solution phases as orthopyroxene (Al 2 O 3 , MgSiO 3 , FeSiO 3 , Ca 0.5 Mg 0.5 SiO 3 , Ca 0.5 Fe 0.5 SiO 3 ) and clinopyroxene (the same components as in Opx plus jadeite end-member) from Lindsley (1981), Carlson and Lindsley (1988), Nickel et al (1985), Gasparik (1985Gasparik ( , 1992, and Perkins and Velzeuf (1992); garnet (almandine, grossular, pyrope) from Fabrichnaya and Kuskov (1994), and Kuskov (1995), and Bosenick and Geiger 1997); and ilmenite (MgTiO 3 , FeTiO 3 ) from Hayob et al (1993). (hercynite).…”

Section: Comments For Tables VII and Viiimentioning

confidence: 96%

Core Sizes and Internal Structure of Earth's and Jupiter's Satellites

Kuskov

Kronrod

2001

Icarus

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Section: Comments For Tables VII and Viiimentioning

confidence: 96%

Core Sizes and Internal Structure of Earth's and Jupiter's Satellites

Kuskov

Kronrod

2001

Icarus

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“…The phase diagram proposed by Dachille et al (1968) was criticized by Jamieson and Olinger (1969), who noted that Dachille et al (1968) used anatase and brookite starting materials rather than rutile. Calculation of the anatase-rutile equilibrium from thermodynamic data do not yield a stability field for anatase at or above STP, indicating that both the slope and locus of phase equilibria for TiO 2 by Dachille et al (1968) are incorrect (Hayob et al 1993). The failure of anatase to react below 500°C is likely to be a kinetic effect resulting from the very slow reaction of anatase to form rutile.…”

Section: Introductionmentioning

confidence: 96%

Rutile/TiO2II phase equilibria

Withers

Essene

Zhang

2003

Contrib Mineral Petrol

Self Cite

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The transition between rutile and a-PbO 2 structured TiO 2 (TiO 2 II) has been investigated at 700-1,200°C and 4.2-9.6 GPa. Hydrothermal phase equilibrium experiments were performed in the multi-anvil apparatus to bracket the phase boundary at 700, 1,000, and 1,200°C. The equilibrium phase boundary is described by the equation: P (GPa)=1.29+0.0065 T (°C). In addition, growth of TiO 2 II was observed in experiments at 500 and 600°C, although growth of rutile was too slow to bracket unambiguously the equilibrium boundary at these temperatures. Water was not detected in either rutile or TiO 2 II, and dry synthesis experiments at 1,200°C were consistent with the phase boundary determined in the fluid-bearing experiments, suggesting that the equilibrium is unaffected by the presence of water. Our bracket of the phase boundary at 700°C is consistent with the reversed, dry experiments of Akaogi et al. (1992) and the reversals of Olsen et al. (1999). The new data suggest that the phase boundary is linear, in agreement with Akaogi et al. (1992), but in striking contrast to the phase diagram inferred by Olsen et al. (1999). The natural occurrence of TiO 2 II requires formation pressures considerably higher than the graphitediamond phase boundary.

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“…Anatase is rare in unaltered gneisses, but pre-impact chloritization of nearby basement granites (Horton et al 2005a) suggests that anatase could have formed as a byproduct of the chloritization of biotite in gneisses prior to the impact event. Another possible mechanism for the formation of anatase, as a metastable phase (Fahmi et al 1993;Hayob et al 1993), may be through partial inversion of TiO 2 II upon decompression. If rutile had been the initial form of TiO 2 in disseminated chlorite grains that now contain abundant anatase and TiO 2 II, it is likely that at least some of the original rutile would remain, as it does in TiO 2 from the matrix and in TiO 2 from the chlorite veins.…”

Section: Discussionmentioning

confidence: 99%

A shock-induced polymorph of anatase and rutile from the Chesapeake Bay impact structure, Virginia, U.S.A.

Jackson

Horton

Chou

et al. 2006

American Mineralogist

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A shock-induced polymorph (TiO 2 II) of anatase and rutile has been identifi ed in breccias from the late Eocene Chesapeake Bay impact structure. The breccia samples are from a recent, partially cored test hole in the central uplift at Cape Charles, Virginia. The drill cores from 744 to 823 m depth consist of suevitic crystalline-clast breccia and brecciated cataclastic gneiss in which the TiO 2 phases anatase and rutile are common accessory minerals. Electron-microprobe imaging and laser Raman spectroscopy of TiO 2 crystals, and powder X-ray diffraction (XRD) of mineral concentrates, confi rm that a high-pressure, α-PbO 2 structured polymorph of TiO 2 (TiO 2 II) coexists with anatase and rutile in matrix-hosted crystals and in inclusions within chlorite. Raman spectra of this polymorph include strong bands at wavenumbers (cm -1 ) 175, 281, 315, 342, 356, 425, 531, 571, and 604; they appear with anatase bands at 397, 515, and 634 cm -1 , and rutile bands at 441 and 608 cm -1 . XRD patterns reveal 12 lines from the polymorph that do not signifi cantly interfere with those of anatase or rutile, and are consistent with the TiO 2 II that was fi rst reported to occur naturally as a shock-induced phase in rutile from the Ries crater in Germany. The recognition here of a second natural shock-induced occurrence of TiO 2 II suggests that its presence in rocks that have not been subjected to ultrahigh-pressure regional metamorphism can be a diagnostic indicator for confi rmation of suspected impact structures.

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Experimental investigation and application of the equilibrium rutile + orthopyroxene = quartz + ilmenite

Cited by 8 publications

References 44 publications

Core Sizes and Internal Structure of Earth's and Jupiter's Satellites

Core Sizes and Internal Structure of Earth's and Jupiter's Satellites

Rutile/TiO2II phase equilibria

A shock-induced polymorph of anatase and rutile from the Chesapeake Bay impact structure, Virginia, U.S.A.

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