DOI: 10.1002/2016GL069963
论文题名: Single-crystal elasticity of natural Fe-bearing orthoenstatite across a high-pressure phase transition
作者: Zhang J.S. ; Bass J.D.
刊名: Geophysical Research Letters
ISSN: 0094-8735
EISSN: 1944-8466
出版年: 2016
卷: 43, 期: 16 起始页码: 8473
结束页码: 8481
语种: 英语
英文关键词: high pressure
; OEN-HPCEN2 transition
; orthoenstatite
; single-crystal elasticity
; X discontinuity
Scopus关键词: Anisotropy
; Elastic moduli
; Elasticity
; Iron compounds
; Adiabatic bulk modulus
; Brillouin spectroscopy
; High pressure
; High-pressure phase transitions
; OEN-HPCEN2 transition
; Orthoenstatite
; Pressure derivatives
; X-discontinuity
; Single crystals
英文摘要: Sound velocities and elastic moduli have been measured on Fe-bearing orthoenstatite (OEN) single crystals up to 12 GPa by Brillouin spectroscopy. The ambient adiabatic bulk modulus (Ks0) and shear modulus (G0) are determined to be 113(1) GPa and 75.9(7) GPa, respectively. A fourth-order finite strain fit to the data yields pressure derivatives of Ks0′ = 8.8(1), Ks0″ = −0.68(6), G0′ = 2.9(1), and G0″ = −0.40(2). These values are significantly higher than those for other major mantle minerals up to 10.5 GPa but lower than some previous measurements on OEN. A pronounced increase of shear anisotropy was observed at a pressure of 12.06(9) GPa, coinciding with a phase transition from orthoenstatite to a recently discovered high-pressure phase with space group P21/c. A high-pressure phase transition in OEN is unlikely to be the cause of the X discontinuity in the 250–325 km depth range. Rather, a change in seismic anisotropy would be expected to accompany the orthoenstatite-to-P21/c phase transition in the upper mantle at greater depths. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84983672041&doi=10.1002%2f2016GL069963&partnerID=40&md5=e4484a3ea64885d231e8363b7c0203ac
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9698
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL, United States
Recommended Citation:
Zhang J.S.,Bass J.D.. Single-crystal elasticity of natural Fe-bearing orthoenstatite across a high-pressure phase transition[J]. Geophysical Research Letters,2016-01-01,43(16).