Elasticity of Orthoenstatite at High Pressure and Temperature: Implications for the Origin of Low V-P/V-S Zones in the Mantle Wedge

doi:10.1002/2017GL075647

GSTDTAP > 气候变化

DOI	10.1002/2017GL075647
	Elasticity of Orthoenstatite at High Pressure and Temperature: Implications for the Origin of Low V-P/V-S Zones in the Mantle Wedge
	Qian, Wangsheng 1,2; Wang, Wenzhong 1,2; Zou, Fan 1,2; Wu, Zhongqing 1,2
	2018-01-28
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2018
卷号	45 期号:2 页码:665-673
文章类型	Article
语种	英语
国家	Peoples R China
英文摘要	Orthopyroxene (opx) is an important mineral in petrologic models for the upper mantle. Its elastic properties are fundamental for understanding the chemical composition and geodynamics of the upper mantle. Here we calculate the elastic properties of orthoenstatite (MgSiO3), the Mg end-member orthopyroxene under upper mantle pressure and temperature conditions using first principle calculations with local density approximation. Bulk and shear moduli increase nonlinearly with pressure at mantle temperatures, but the shear modulus and V-S show very weak pressure dependence in comparison with V-P. Compared to other major minerals in the upper mantle, orthoenstatite has the lowest compressional velocities (V-P), shear velocities (V-S), and V-P/V-S ratio down to the depth of approximately 300 km. The enrichment of opx in the upper mantle can cause the unusually low V-P/V-S observed in the mantle wedge.
领域	气候变化
收录类别	SCI-E
WOS记录号	WOS:000425514300021
WOS关键词	SINGLE-CRYSTAL ELASTICITY ; ORTHO-PYROXENE ; SEISMIC VELOCITIES ; PHASE-TRANSITION ; MGSIO3 ORTHOENSTATITE ; SOUND VELOCITIES ; ROOM-TEMPERATURE ; SUBDUCTING-SLAB ; LITHOSPHERE ; ENRICHMENT
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
引用统计	被引频次：37[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/27649
专题	气候变化
作者单位	1.Univ Sci & Technol China, Sch Earth & Space Sci, Lab Seismol & Phys Earths Interior, Hefei, Anhui, Peoples R China; 2.Natl Geophys Observ, Mengcheng, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Qian, Wangsheng,Wang, Wenzhong,Zou, Fan,et al. Elasticity of Orthoenstatite at High Pressure and Temperature: Implications for the Origin of Low V-P/V-S Zones in the Mantle Wedge[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(2):665-673.
APA	Qian, Wangsheng,Wang, Wenzhong,Zou, Fan,&Wu, Zhongqing.(2018).Elasticity of Orthoenstatite at High Pressure and Temperature: Implications for the Origin of Low V-P/V-S Zones in the Mantle Wedge.GEOPHYSICAL RESEARCH LETTERS,45(2),665-673.
MLA	Qian, Wangsheng,et al."Elasticity of Orthoenstatite at High Pressure and Temperature: Implications for the Origin of Low V-P/V-S Zones in the Mantle Wedge".GEOPHYSICAL RESEARCH LETTERS 45.2(2018):665-673.