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Single-crystal elasticity of iron-bearing phase E and seismic detection of water in Earth's upper mantle

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.

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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.

Item Type:Article
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URLURL TypeDescription Material
Satta, Niccolò0000-0003-0397-6511
Boffa Ballaran, Tiziana0000-0002-4567-8961
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
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)MA4534/3-1
Deutsche Forschungsgemeinschaft (DFG)GRK 2156/1
Bavarian Academy of SciencesUNSPECIFIED
Subject Keywords:DHMS, phase E, Brillouin spectroscopy, elasticity
Issue or Number:10
Record Number:CaltechAUTHORS:20191003-152115005
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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:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99061
Deposited By: Tony Diaz
Deposited On:03 Oct 2019 22:42
Last Modified:16 Nov 2021 17:43

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