Satta, Niccolò and Marquardt, Hauke and Kurnosov, Alexander and Buchen, Johannes and Kawazoe, Takaaki and McCammon, Catherine and Boffa Ballaran, Tiziana (2019) Single-crystal elasticity of iron-bearing phase E and seismic detection of water in Earth's upper mantle. American Mineralogist, 104 (10). pp. 1526-1529. ISSN 0003-004X. doi:10.2138/am-2019-7084. https://resolver.caltech.edu/CaltechAUTHORS:20191003-152115005
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Abstract
The elastic properties of Mg_(2.12(2))Fe_(0.21(2))Ni_(0.01)Si_(1.15(1))O_6H_(2.67(8)) phase E single crystals with Fe^(3+)/ΣFe = 0.25(3) have been determined by Brillouin spectroscopy at ambient conditions. We find that that the elasticity of iron-bearing phase E is described by the six independent stiffness tensor components (all in units of GPa): C_(11) = 192.2(6), C_(12) = 56.4(8), C_(13) = 43.5(8), C_(14) = –4.3(3), C_(33) = 192.1(7), C_(44) = 46.4(3). The Voigt-Reuss-Hill averages of bulk and shear moduli are 95.9(4) and 59.6(2) GPa, respectively. The aggregate velocities of iron-bearing phase E are ν_P = 7.60(2) and ν_S = 4.43(1) km/s, markedly lower than those of major mantle minerals at ambient conditions. Modeling based on our results suggests that the presence of iron-bearing phase E may reduce the sound wave velocities in upper mantle and transition zone rocks, making it a possible target for future seismological investigations aiming to map hydration in subducting slabs.
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| Additional Information: | © 2019 Mineralogical Society of America. Manuscript received April 19, 2019; Manuscript accepted July 8, 2019; Manuscript handled by Ian Swainson. We thank R. Njul for polishing the crystal platelets. This research was supported through the project “GeoMaX” funded under the Emmy-Noether Program of the German Science Foundation DFG (MA4534/3-1) as well as the International Research Training Group “Deep Earth Volatile Cycles” (GRK 2156/1). H. Marquardt acknowledges support from the Bavarian Academy of Sciences. N. Satta thanks S. Speziale for his suggestions on Brillouin scattering measurements. | |||||||||
| Group: | Seismological Laboratory | |||||||||
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| Subject Keywords: | DHMS, phase E, Brillouin spectroscopy, elasticity | |||||||||
| Issue or Number: | 10 | |||||||||
| DOI: | 10.2138/am-2019-7084 | |||||||||
| Record Number: | CaltechAUTHORS:20191003-152115005 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20191003-152115005 | |||||||||
| Official Citation: | Niccolò Satta, Hauke Marquardt, Alexander Kurnosov, Johannes Buchen, Takaaki Kawazoe, Catherine McCammon, Tiziana Boffa Ballaran; Single-crystal elasticity of iron-bearing phase E and seismic detection of water in Earth's upper mantle. American Mineralogist ; 104 (10): 1526–1529. doi: https://doi.org/10.2138/am-2019-7084 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 99061 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 03 Oct 2019 22:42 | |||||||||
| Last Modified: | 16 Nov 2021 17:43 |
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