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Dynamic compression of diopside and salite to 200 GPa

Svendsen, Bob and Ahrens, Thomas J. (1983) Dynamic compression of diopside and salite to 200 GPa. Geophysical Research Letters, 10 (7). pp. 501-504. ISSN 0094-8276. doi:10.1029/GL010i007p00501.

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New Hugoniot data on single crystal diopside, CaMgSi_2O_6 (Di), suggest that transformation to a high-pressure thermomechanical state begins at ∼50 GPa and is complete above 100 GPa, in agreement with other pyroxenes and silicates of geophysical interest. Comparison of the new high pressure phase (HPP) data for Di and salite, CaMg_(0.82)Fe_(0.18)Si_2O_6 (Sa) with appropriate mixed oxide and perovskite models implies compatibility between either model and the data. Conversely, least-squares fits to the HPP Di data favor lower (3.6 - 3.9 Mg/m³) values of zero-pressure, room-temperature density than the models (4.0 - 4.1 Mg/m³). Similar comments apply to porosity-corrected HPP hedenbergite (Hd) data. The HPP Di, Sa, and Hd data also imply much larger density differences between these compositions in the HPP regime (e.g., ≈0.8 Mg/m³ between Di and Hd) than at STP (0.38 Mg/m³). This may represent the influence of multiple transition processes (e.g., polymorphism and Fe^(2+) high-low spin) as a function of Fe content across the Di-Hd series. The new HPP Sa data closely parallel (≈0.1 Mg/m³ less dense) the lower mantle density profile from ∼90 GPa to 136 GPa. Our results are consistent with the speculations of Jeanloz and Ahrens on the possibility of significant Ca in the lower mantle.

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Additional Information:Copyright 1983 by the American Geophysical Union. (Received February 18, 1983; accepted March 11, 1983.) Paper number 3L0461. We thank E. Gelle, M. Long, W. Ginn and their assistants, whose experimental expertise make our work at the Lindhurst Lab possible. We thank M. S. Vassiliou and J. Bass for reviewing an earlier version of this manuscript and making many helpful suggestions. M. S. Vassiliou, J. Bass, M. Boslough and D. L. Anderson provided helpful discussions. We are indebted to S. Huebner (USGS, Reston, VA) for providing diopside samples. Support was provided by the National Science Foundation, grant #EAR 80-18819. Contribution #3877, Division of Geological and Planetary Sciences, California Institute of Technology.
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NSFEAR 80-18819
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Caltech Division of Geological and Planetary Sciences3877
Issue or Number:7
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Official Citation:Bob Svendsen and Thomas J. Ahrens (1983), Dynamic compression of diopside and salite to 200 GPa. Geophysical Research Letters, 10: 501–504. doi: 10.1029/GL010i007p00501
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51136
Deposited By: George Porter
Deposited On:03 Nov 2014 16:16
Last Modified:10 Nov 2021 19:06

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