Compressibility of synthetic glaucophane |
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| Authors: | David M Jenkins Juan Carlos Corona William A Bassett Kenji Mibe Zhongwu Wang |
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| Institution: | (1) Department of Geological Sciences and Environmental Studies, Binghamton University, Binghamton, NY 13902-6000, USA;(2) Department of Earth and Atmospheric Sciences, Cornell University, Snee Hall, Ithaca, NY 14853, USA;(3) Earthquake Research Institute, University of Tokyo, Yayoi, Tokyo 113-0032, Japan;(4) Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853, USA |
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| Abstract: | The compressibilities of two synthetic glaucophane samples were measured over the range of 0–10 GPa at ambient temperature
in a diamond-anvil cell at the Cornell High-Energy Synchrotron Source (CHESS). The pressure–volume data were fitted to the
Birch–Murnaghan equation of state taking care to include only data with a minimum of deviatoric stress. When using a second-order
truncation, both samples yielded essentially identical values of the bulk modulus K
0, which had an average value of 91.8 ± 1.3 GPa. Maximum compression was observed approximately along the a* axis as shown by the strain ellipsoid and supported by the a axis showing the highest compressibility. These results agree closely with the earlier study of a natural glaucophane single-crystal
by Comodi et al. (Eur J Mineral 3:485–499, 1991), suggesting that the substitution of about 20–30 mol.% of Fe for Mg and Al in the structure may not significantly change
its compressibility. |
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