Effects of water on the α-β transformation kinetics in San Carlos Olivine

Science

Volumn 281, Issue 5373, 1998, Pages 85-87

  Kubo, Tomoaki ^a   Ohtani, Eiji ^a   Kato, Takumi ^b   Shinmei, Toru ^c   Fujino, Kiyoshi ^c  

^a TOHOKU UNIVERSITY   (Japan)

^b UNIVERSITY OF TSUKUBA   (Japan)

^c HOKKAIDO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

GRAPHITE; MAGNESIUM HYDROXIDE; MINERAL; PLATINUM; SODIUM CHLORIDE; WATER;

MANTLE; OLIVINE; PHASE TRANSITION; TRANSFORMATION; WATER;

ARTICLE; INFRARED SPECTROSCOPY; PHASE TRANSITION; PRESSURE; PRIORITY JOURNAL; TEMPERATURE; TRANSMISSION ELECTRON MICROSCOPY; WATER CONTENT; X RAY DIFFRACTION;

EID: 0032479525     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.281.5373.85     Document Type: Article

References (19)

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4. J. Chen, T Inoue, D. J. Weidner, Y. Wu, M. T. Vaughan, ibid. 25, 575 (1998).
5. 4 [H. Morishima et al., Science 265, 1202 (1994)] at 1030°C. It is possible that pressures are higher when NaCl is used around the sample than in a normal multianvil calibration experiment at similar oil pressures because of the high coefficient of thermal expansion of NaCl.
6. 2O) in this study, effects of water on the α-β phase boundary are negligible.
7. 2O) in this study, effects of water on the α-β phase boundary are negligible.
8. The measured temperature is lower than that at the center of the heater by about 30°C at 1000°C based on measurements with two thermocouples. Therefore, we corrected the measured temperature of the sample by taking into account the effect of the temperature gradient in the furnace. The effect of pressure on the emf of the thermocouple was ignored in the present experiments.
9. Microstructures of the recovered samples and crystal-lographic orientation relations between the reactant and product phases were examined with a 200-kV JEOL-2010 TEM.
10. Electron microprobe analysis of the recovered samples revealed that small, iron-rich grains (less than 10 μm) with olivine stoichiometry exist within the reaction rim especially near the surface. The Mg/(Mg + Fe) ratios in these iron-rich grains range from about 81 to 85. This suggests that the iron-rich grains are ringwoodite, and the transformation occurred in the coexisting field of wadsleyite and ringwoodite at lower temperature before the desired value was reached.
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15. FTIR measurements were carried out in air. Thickness of the sample was 80 to 140 μm, and aperture size ranged from 50 μm by 50 μm to 500 μm by 500 μm. Water content of wadsteyite was estimated from the integration of the infrared spectra using the calibration by Paterson [M. S. Paterson, Bull. Mineral. 105, 20 (1982)].
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19. We thank D. C. Rubie, S. Karato, and J. P. Poirier for suggestions; H. Keppler, T. Terada, and M. Akizuki for the FTIR measurements; and T. Nagase and N. Miyajima for the TEM observation. This work was supported in part by a Grant-in-Aid for Scientific Research (A) (09304051) from the Japanese Ministry of Education, Science, Sports, and Culture (to E.O.).