DOI: 10.1002/2016GL067803
论文题名: Small post-perovskite patches at the base of lower mantle primordial reservoirs: Insights from 2-D numerical modeling and implications for ULVZs
作者: Li Y. ; Deschamps F. ; Tackley P.J.
刊名: Geophysical Research Letters
ISSN: 0094-9162
EISSN: 1944-8893
出版年: 2016
卷: 43, 期: 7 起始页码: 3215
结束页码: 3225
语种: 英语
英文关键词: core-mantle boundary temperature
; postperovskite
; thermochemical mantle convection
; ultralow-velocity zones
Scopus关键词: Structural geology
; Velocity control
; Anticorrelation
; Core-mantle boundary
; Dense materials
; Lowermost mantle
; Numerical experiments
; Post-perovskite
; Thermo-chemical mantle convections
; Ultralow velocity zone
; Perovskite
英文摘要: We perform numerical experiments of thermochemical mantle convection in 2-D spherical annulus geometry to investigate the distribution of post-perovskite (pPv) with respect to the location of primordial reservoirs of dense material in the lowermost mantle. High core-mantle boundary temperatures lead to strong anticorrelation between the locations of pPv and large primordial reservoirs, while low values lead to a pPv layer fully covering the outer core. Intermediate values avoid a full pPv layer but allow pPv phase change to occur within the primordial reservoirs. Through interactions between cold downwellings and primordial reservoirs, low viscosity (weak) pPv leads to the formation of long-lived, thin tails of primordial materials extending laterally at the edges of these reservoirs. Small patches of pPv also form within the primordial reservoir but are short-lived. If primordial reservoirs are enriched in iron, these patches may provide an explanation for the ultralow-velocity zones. © 2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981764754&doi=10.1002%2f2016GL067803&partnerID=40&md5=4507b8da1135eb02a4fe1047a30a8291
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10125
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: Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
Recommended Citation:
Li Y.,Deschamps F.,Tackley P.J.. Small post-perovskite patches at the base of lower mantle primordial reservoirs: Insights from 2-D numerical modeling and implications for ULVZs[J]. Geophysical Research Letters,2016-01-01,43(7).