Abstract
Annealing experiments on agate were performed to investigate grain growth kinetics and the effect of crystallographic anisotropy on normal grain growth of quartz. The experiments were conducted using a piston-cylinder apparatus at 700–800°C and 0.5 GPa for 0–66 h. The grain growth rate was expressed by D n −D n 0 = kt with k = k 0 exp(−H*/RT) where D 0 is the initial grain size at t = 0, with n = 4.4 ± 0.3, and H* = 191.3 ± 11.0 kJ/mol is the activation enthalpy and logk 0 = 19.8 ± 1.4. While the grain aspect ratios are nearly constant at ~0.7 (short/long) during grain growth, the longest axis in individual grains tends to be oriented parallel to their c-axis, indicating that a primary crystal-preferred orientation of c-axis of the agate could result in the development of a weak shape-preferred orientation during grain growth.
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Acknowledgments
We thank T. Masuda, I. Shimizu, M. Kumazawa, Y. Kato, and Y. Watanabe for their help in establishing the Rock-Deformation Experimental Laboratory at Shizuoka University. We also thank Y. Nasuda for assistance during the experiments, T. Hiraga and J. Muto for valuable comments during the study, T. Ubukata, T. Ohuchi and D. Yamazaki for the data analyses, A. Stallard for improving the English, and an anonymous reviewer for thoughtful comments. This work was supported by grants from the Japan Society for the Promotion of Science (K. Michibayashi) and from the Cooperative Research Programs of the Earthquake Research Institute, University of Tokyo.
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Michibayashi, K., Imoto, H. Grain growth kinetics and the effect of crystallographic anisotropy on normal grain growth of quartz. Phys Chem Minerals 39, 213–218 (2012). https://doi.org/10.1007/s00269-011-0476-6
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DOI: https://doi.org/10.1007/s00269-011-0476-6