| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Journal of Petrology | Volume 44 | Number 4 | Pages 773-788 | 2003
© Oxford University Press 2003
Kinetics of the Coesite–Quartz Transition: Application to the Exhumation of Ultrahigh-Pressure Rocks
LABORATOIRE DE SCIENCES DE LA TERRE, UMR 5570 CNRS–UCB LYON 1–ENS LYON, BAT. 402 GÈODE, 43 BD DU 11 NOVEMBRE 1918, 69622 VILLEURBANNE CEDEX, FRANCE
Telephone: +33 (0)4 72 44 84 90. Fax: +33 (0)4 72 44 85 93. E-mail: Jean-Philippe.Perrillat{at}univ-lyon1.fr
The kinetics of the quartz–coesite phase transition has been studied in situ by X-ray diffraction in the 2·1–3·2 GPa, 500–1010°C pressure–temperature range. Analysis of the data within Cahn's model of nucleation and growth at grain boundaries reveals that the prograde and retrograde reactions have different kinetics. The quartz 
coesite transformation is one order of magnitude faster than coesite quartz. Both reactions are characterized by high nucleation rates, so that the overall reaction kinetics is controlled by crystal growth processes. For the coesite quartz transformation, growth rates are extrapolated using Turnbull's equation with an activation energy for the transition of 163 ± 23 kJ/mol. This kinetic law is combined with an ‘inclusion in a host’ elastic model to study the contribution of kinetics in coesite preservation. This numerical modelling shows that above 400°C retrograde transformation of coesite to quartz is mainly controlled by the ‘pressure vessel’ effect of the host phase, whereas reaction kinetics is the controlling factor at lower temperatures. The influence of the shape of the P–T path and the exhumation rate upon the retrogression of coesite to quartz are investigated to use the percentage of unretrogressed coesite inclusions to constrain P–T–t paths.
KEY WORDS: coesite; quartz; kinetics; ultrahigh-pressure metamorphism; P–T–t paths
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  A. Lenze and B. Stockhert Microfabrics of quartz formed from coesite (Dora-Maira Massif, Western Alps) European Journal of Mineralogy, October 1, 2008; 20(5): 811 - 826. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. J. O'Brien and M. A. Ziemann Preservation of coesite in exhumed eclogite: insights from Raman mapping European Journal of Mineralogy, October 1, 2008; 20(5): 827 - 834. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. P. Perrillat Kinetics of high-pressure mineral phase transformations using in situ time-resolved X-ray diffraction in the Paris-Edinburgh cell: a practical guide for data acquisition and treatment Mineralogical Magazine, April 1, 2008; 72(2): 683 - 695. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 W. C. McClelland, S. E. Power, J. A. Gilotti, F. K. Mazdab, and B. Wopenka U-Pb SHRIMP geochronology and trace-element geochemistry of coesite-bearing zircons, North-East Greenland Caledonides Geological Society of America Special Papers, January 1, 2006; 403(0): 23 - 43. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. Sanloup, B. C. Schmidt, E. M. C. Perez, A. Jambon, E. Gregoryanz, and M. Mezouar Retention of Xenon in Quartz and Earth's Missing Xenon Science, November 18, 2005; 310(5751): 1174 - 1177. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. L. Mosenfelder, H.-P. Schertl, J. R. Smyth, and J. G. Liou Factors in the preservation of coesite: The importance of fluid infiltration American Mineralogist, May 1, 2005; 90(5-6): 779 - 789. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. W. Schmid Rigid polygons in shear Geological Society, London, Special Publications, January 1, 2005; 245(1): 421 - 431. [Abstract] [PDF]
|
|
|
|
|
|
C. Lathe, M. Koch-Muller, R. Wirth, W. Van Westrenen, H.-J. Mueller, F. Schilling, and J. Lauterjung The influence of OH in coesite on the kinetics of the coesite-quartz phase transition American Mineralogist, January 1, 2005; 90(1): 36 - 43. [Abstract] [Full Text] [PDF]
|
|