Abstract
The olivine-beta phase transformation in Co2SiO4 has been studied in a large-volume high-pressure apparatus (USSA-2000). The experimental conditions straddle the univariant phase boundaries due to the presence of a substantial temperature gradient (150–200° C over the 3-mm length of the sample). At conditions close to equilibrium, the transformation mechanism is one of limited nucleation with rapid growth of large crystals of the beta phase. Transmission electron microscopy (TEM) analysis shows that the cation stacking faults in Co2SiO4-spinel are identical to those seen in numerous spinels. The 010 faults in beta-Co2SiO4 are found to be identical to those seen in beta-(Mg,Fe)2SiO4 found in shocked veins in meteorites.
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References
Akimoto S, Sato Y (1968) High-pressure transformation in Co2- SiO4 olivine and some geophysical implications. Phys Earth Planet Inter 1:498–504
Brearley AJ, Rubie DC, Ito E (1991) Mechanisms of the transformations between the alpha, beta, and gamma polymorphs of Mg2SiO4 at 900° C and 15 GPa. Phys Chem Minerals, submitted for publication
Burnley PC, Green HW, II (1989) Stress dependence of the mechanism of the olivine-spinel transformation. Nature 338:753–756
Burnley PC, Green HW, II, Prior DJ (1991) Faulting associated with the olivine to spinel transformation in Mg2GeO4 and its implications for deep-focus earthquakes. J Geophys Res 96:425–443
Cemič L, Geiger CA, Hoyer WW, Koch-Muller M, Langer K (1990) Piston-cylinder techniques: Pressure and temperature calibration of a pyrophyllite-based assembly by means of DTA measurements, a salt-based assembly, and a cold sealing sample encapsulation method. Neues Jahrb Mineral Monatsh 76:49–64
Gasparik T (1989) The high-pressure stability of mantle pyroxenes. Contrib Mineral Petrol 102:389–405
Green HW, II (1984) How and why does olivine transform to spinel? Geophys Res Lett 1:817–820
Guyot F, Gwanmesia GD, Liebermann RC (1991) An olivine to betaphase transformation mechanism in Mg2SiO4. Geophys Res Lett 18:89–92
Horiuchi H, Akaogi M, Sawamoto H (1982) Crystal structure studies on spinel-related phases, spinelloids: implications to olivine-spinel transformation and systematics. In: Akimoto S, Manghnani MH (eds) High-Pressure Research in Geophysics. Center for Academic Publishing, Tokyo; Riedel Publishing Co., Boston, pp 391–403
Lacam A, Madon M, Poirier J-P (1980) Olivine glass and spinel formed in a laser heater, diamond-anvil high pressure cell. Nature 2889:155–157
Lewis MH (1966) Defects in spinel crystals grown by the Verneuil process. Philos Mag 14:10,003–10,0018
Liebermann RC, Prewitt CT, Weidner DJ (1985) Large-volume, high-pressure mineral physics in Japan. EOS 66:138–139
Lloyd EC (1971) Accurate characterization of the high-pressure environment. National Bureau of Standards Special Publication 326, Washington DC, pp 1–3
Lu R (1990) Kinetic rates of the transformations between the garnet and perovskite phases of CaGeO3. Master's thesis, Mineral Physics Institute, State University of New York at Stony Brook
Madon M, Poirier J-P (1980) Dislocations in spinel and garnet high-pressure polymorphs of olivine and pyroxene: Implications for mantle rheology. Science 207:66–68
Madon M, Poirier J-P (1983) Transmission electron microscope observation of alpha, beta, and gamma (Mg,Fe)2SiO4 in shocked meteorites: planar defects and polymorphic transitions. Phys Earth Planet Inter 33:31–44
Navrotsky A, Pintchovski FS, Akimoto S (1979) Calorimetric study of the stability of high-pressure phases in the systems CoO-SiO2 and “FeO”-SiO2, and calculations of phase diagrams in MO-SiO2 systems. Phys Earth Planet Inter 19:275–292
Price GD (1983) The nature and significance of stacking faults in wadsleyite, natural beta-(Mg,Fe)2SiO4 from the Peace River meteorite. Phys Earth Planet Inter 33:137–147
Price GD, Putnis A, Agrell SO (1979) Electron petrography of shock-produced veins in the Tenham chondrite. Contrib Mineral Petrology 71:211–218
Price GD, Putnis A, Smith DGW (1982) A spinel to beta-phase transformation mechanism in (Mg,Fe)2SiO4. Nature 296:729–731
Price GD, Putnis A, Agrell SO, Smith DGW (1983) Wadsleyite, natural beta-(Mg,Fe)2SiO4 from the Peace River meteorite. Can Mineral 21:29–35
Putnis A, Price GD (1979) High-pressure (Mg,Fe)2SiO4 phases in the Tenham chondritic meteorite. Nature 280:217–218
Remsberg AR (1990) A study of the polymorphic phase transformations in Co2SiO4. Ph.D. thesis, Mineral Physics Institute, State University of New York at Stony Brook
Remsberg AR, Boland JN, Gasparik T, Liebermann RC (1987) Deciphering the polymorphic transitions in Co2SiO4. EOS 68:1539
Remsberg AR, Boland JN, Gasparik T, Liebermann RC (1988a) Mechanism of the olivine-spinel transformation in Co2SiO4. Proceedings, NATO Advanced Study Institute, Physical Properties and Thermodynamic Behaviour of Minerals, Cambridge, England, 27 July–8 August, 1987. Phys Chem Minerals 15:498–506
Remsberg AR, Reeder RJ, Liebermann RC (1988b) Microstructures of the beta-phase of Co2SiO4. EOS 69:499
Rubie DC, Tsuchida Y, Yagi T, Utsumi W, Kikegawa T, Shimomura O, Brearley AJ (1990) An in situ x-ray diffraction study of the kinetics of the Ni2SiO4 olivine-spinel transformation. J Geophys Res 95:15,829–15,844
Rubie DC, Brearley AJ (1990) Mechanism of the gamma-betaphase transformation of Mg2SiO4 at high temperature and pressure. Nature 348:628–631
Sawamoto H (1986) Single crystal growth of the modified spinel (beta) and spinel (gamma) phases of (Mg,Fe)2SiO4 and some geophysical implications. Phys Chem Minerals 13:1–10
Susaki J, Akaogi M, Akimoto S, Shimomura O (1985) Garnetperovskite transformation in CaGeO3: In situ x-ray measurements using synchrotron radiation. Geophys Res Lett 12:729–732
Vaughan PJ, Kohlstedt DL (1981) Cation stacking faults in magnesium germanate spinel. Phys Chem Minerals 7:241–245
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Remsberg, A.R., Liebermann, R.C. A study of the polymorphic transformations in Co2SiO4 . Phys Chem Minerals 18, 161–170 (1991). https://doi.org/10.1007/BF00233999
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DOI: https://doi.org/10.1007/BF00233999