DOI: 10.1002/2014GL060890
论文题名: Implications for melt transport and source heterogeneity in upwelling mantle from the magnitude of Sp converted phases generated at the onset of melting
作者: Havlin C. ; Parmentier E.M.
刊名: Geophysical Research Letters
ISSN: 0094-9861
EISSN: 1944-9592
出版年: 2014
卷: 41, 期: 15 起始页码: 5444
结束页码: 5450
语种: 英语
英文关键词: geodynamics
; melt migration
; melting
; melting onset
; receiver function
; water
Scopus关键词: Geodynamics
; Seismic waves
; Water
; Seismology
; Velocity
; Heterogeneous mantle
; Mantle source
; Mantle viscosity
; Melt fraction
; Melt migration
; Melt transports
; Receiver functions
; Seismic velocities
; Wet and dry
; Melting
; amplitude
; heterogeneity
; mantle
; seismic velocity
; water content
英文摘要: Recently detected converted phases in upwelling mantle have been attributed to seismic velocity gradients at the onset of melting. In this study, we investigate conditions required to generate a melting onset phase by combining melt migration models with synthetic receiver functions. We find that increasing upwelling velocity, increasing mantle viscosity, and decreasing water content in the mantle source increases the predicted strength of a melting onset phase. Differences in these parameters between study regions may explain observed variations in converted phase magnitude. For a wet mantle source, the amplitude of synthetic receiver functions, calculated using a standard relationship for dependence of seismic velocity on melt fraction, is lower than observed amplitudes. One possibility is that the observed receiver functions indicate a heterogeneous mantle source in which wet and dry components melt independently. Alternatively, the dependence of seismic velocity on melt fraction at very low melt fractions may be much stronger than that used here, as suggested in recent studies. Key Points Melting onset phase magnitude depends strongly on mantle water concentration A plume with dry interior and hydrated rim may explain observations Melting onset phases should be easier to observe in plumes compared to ridges © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905311123&doi=10.1002%2f2014GL060890&partnerID=40&md5=9f714ff62f3a5d32561e8ee5c3923525
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7125
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Sciences, Brown University, Providence, RI, United States
Recommended Citation:
Havlin C.,Parmentier E.M.. Implications for melt transport and source heterogeneity in upwelling mantle from the magnitude of Sp converted phases generated at the onset of melting[J]. Geophysical Research Letters,2014-01-01,41(15).