DOI: 10.1002/2015GL064908
论文题名: Partial melting of a Pb-Sn mushy layer due to heating from above, and implications for regional melting of Earth's directionally solidified inner core
作者: Yu J. ; Bergman M.I. ; Huguet L. ; Alboussiere T.
刊名: Geophysical Research Letters
ISSN: 0094-9288
EISSN: 1944-9019
出版年: 2015
卷: 42, 期: 17 起始页码: 7046
结束页码: 7053
语种: 英语
英文关键词: inner core
; melting
; solidification
Scopus关键词: Ingots
; Lead
; Metal castings
; Solidification
; Tin
; Core boundary
; Different densities
; Directionally solidified
; Earth's inner cores
; Inner core
; Partial melting
; Seismic properties
; Sn alloys
; Melting
; heating
; inner core
; lead
; melting
; microstructure
; seismic property
; solidification
; strontium
英文摘要: Superimposed on the radial solidification of Earth's inner core may be hemispherical and/or regional patches of melting at the inner-outer core boundary. Little work has been carried out on partial melting of a dendritic mushy layer due to heating from above. Here we study directional solidification, annealing, and partial melting from above of Pb-rich Sn alloy ingots. We find that partial melting from above results in convection in the mushy layer, with dense, melted Pb sinking and resolidifying at a lower height, yielding a different density profile than for those ingots that are just directionally solidified, irrespective of annealing. Partial melting from above causes a greater density deeper down and a corresponding steeper density decrease nearer the top. There is also a change in microstructure. These observations may be in accordance with inferences of east-west and perhaps smaller-scale variations in seismic properties near the top of the inner core. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84943366571&doi=10.1002%2f2015GL064908&partnerID=40&md5=c1271dc1edcd0ae52146319388ebdb92
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8904
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: Physics Department, Simon's Rock of Bard College, Great Barrington, MA, United States
Recommended Citation:
Yu J.,Bergman M.I.,Huguet L.,et al. Partial melting of a Pb-Sn mushy layer due to heating from above, and implications for regional melting of Earth's directionally solidified inner core[J]. Geophysical Research Letters,2015-01-01,42(17).