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GEOREF RECORD

Effect of hydration on the single-crystal elasticity of Fe-bearing wadsleyite to 12 GPa

Zhu Mao, Steven D. Jacobsen, Daniel J. Frost, Catherine A. McCammon, Erik H. Hauri and Thomas S. Duffy
Effect of hydration on the single-crystal elasticity of Fe-bearing wadsleyite to 12 GPa
American Mineralogist (October 2011) 96 (10): 1606-1612

Abstract

The single-crystal elastic properties of Fe-bearing wadsleyite with 1.93 wt% H (sub 2) O (Mg (sub 1.634) Fe (sub 0.202) H (sub 0.305) SiO (sub 4) ) have been determined by Brillouin scattering. At ambient conditions, the aggregate bulk and shear moduli (K (sub S0) , G (sub 0) ) of this wadsleyite are 156.2(5) and 98.0(3) GPa, respectively. Compared to the corresponding anhydrous wadsleyite, 1.93 wt% H (sub 2) O lowers K (sub S0) and G (sub 0) by 8.1% and 9.3%, respectively. High-pressure measurements up to 12 GPa show that the pressure derivative of the bulk modulus, K' (sub S0) =4.8(1), is similar to that of the anhydrous Fe-wadsleyite with reported values of 4.6-4.74, but the addition of H (sub 2) O increases the pressure derivative of the shear modulus, G (sub 0) ' from 1.5(1) to 1.9(1). This contrasts with the G (sub 0) ' of Fe-free wadsleyite, which is the same within uncertainty for the hydrous and anhydrous phases. As a result, both the compressional- and shear-wave velocities (v (sub P) , v (sub S) ) of hydrous Fe-bearing wadsleyite are about 200(+ or -24) m/s slower than anhydrous Fe-bearing wadsleyite at transition zone pressures.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 96
Serial Issue: 10
Title: Effect of hydration on the single-crystal elasticity of Fe-bearing wadsleyite to 12 GPa
Affiliation: Princeton University, Department of Geosciences, Princeton, NJ, United States
Pages: 1606-1612
Published: 201110
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 59
Accession Number: 2011-103095
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Northwestern University, USA, United StatesUniversitaet Bayreuth, DEU, GermanyCarnegie Institution of Washington, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201152
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