DOI: 10.1002/2014GL059334
论文题名: Unusually large shear wave anisotropy for chlorite in subduction zone settings
作者: Mookherjee M. ; Mainprice D.
刊名: Geophysical Research Letters
ISSN: 0094-10278
EISSN: 1944-10009
出版年: 2014
卷: 41, 期: 5 起始页码: 1506
结束页码: 1513
语种: 英语
英文关键词: anisotropy
; chlorite
; elasticity
; high-pressure
; hydrous phases
; subduction zone
Scopus关键词: Elastic constants
; Elasticity
; Seismology
; Serpentine
; Shear waves
; Wave propagation
; chlorite
; Elastic constant tensor
; First principle simulation
; high-pressure
; High-pressure elasticity
; Hydrous phasis
; Shear elastic constants
; Subduction zones
; Anisotropy
; chlorite
; elastic wave
; elasticity
; S-wave
; simulation
; subduction zone
; wave velocity
英文摘要: Using first principle simulations we calculated the elasticity of chlorite. At a density ρ~ 2.60 g cm-3, the elastic constant tensor reveals significant elastic anisotropy: VP ~27%, VS1 ~56%, and VS2 ~43%. The shear anisotropy is exceptionally large for chlorite and enhances upon compression. Upon compression, the shear elastic constant component C44 and C55 decreases, whereas C66 shear component stiffens. The softening in C44 and C55 is reflected in shear modulus, G, and the shear wave velocity, VS. Our results on elastic anisotropy at conditions relevant to the mantle wedge indicates that a 10-20 km layer of hydrated peridotite with serpentine and chlorite could account for the observed shear polarization anisotropy and associated large delay times of 1-2 s observed in some subduction zone settings. In addition, chlorite could also explain the low VP/VS ratios that have been observed in recent high-resolution seismological studies. Key Points First report of high pressure elasticity of chlorite Unusual shear wave anisotropy for chlorite Shear elastic anisotropy explains seismological observations in subduction zones ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895777883&doi=10.1002%2f2014GL059334&partnerID=40&md5=2c2aaaf3cb5e59fc963431fc8292ea3e
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7542
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Earth and Atmospheric Sciences, Cornell University, Ithaca NY, United States
Recommended Citation:
Mookherjee M.,Mainprice D.. Unusually large shear wave anisotropy for chlorite in subduction zone settings[J]. Geophysical Research Letters,2014-01-01,41(5).