DOI: 10.1002/2015GL066546
论文题名: A flow law for ilmenite in dislocation creep: Implications for lunar cumulate mantle overturn
作者: Dygert N. ; Hirth G. ; Liang Y.
刊名: Geophysical Research Letters
ISSN: 0094-9467
EISSN: 1944-9198
出版年: 2016
卷: 43, 期: 2 起始页码: 532
结束页码: 540
语种: 英语
英文关键词: cumulate overturn
; dislocation creep
; Griggs apparatus
; ilmenite
; lunar
Scopus关键词: Creep
; Ilmenite
; International law
; Lunar missions
; Silicate minerals
; Structural geology
; Viscosity
; Core-mantle boundary
; Cumulate overturn
; Dislocation creep
; Effective viscosity
; Griggs apparatus
; Lunar
; Orders of magnitude
; Seismic attenuation
; Moon
; core-mantle boundary
; cumulate
; dislocation creep
; experimental apparatus
; ilmenite
; lunar mantle
; olivine
; overturn
; viscosity
英文摘要: We present results from new deformation experiments and a dislocation creep flow law for synthetic ilmenite. The flow law predicts an effective viscosity more than 3 orders of magnitude lower than dry olivine at mantle stresses and temperatures. Using the flow law, we predict that lunar ilmenite-bearing cumulates (IBC) will be weakened by the presence of low-viscosity ilmenite. Dense, low-viscosity IBC are expected to flow into the lunar interior by a process known as cumulate mantle overturn. Low-viscosity IBC that sink to the core-mantle boundary may be dynamically stable with respect to upwelling. A hot, stable layer of IBC surrounding the lunar core would suppress the development of a core dynamo. A layer of partially molten IBC can also explain the inferred zone of seismic attenuation around the lunar core, as well as a low-viscosity layer suggested by tidal dissipation. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955502028&doi=10.1002%2f2015GL066546&partnerID=40&md5=8d0d848dacc26dafea0e3b1120f3bcab
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10430
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: Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, United States
Recommended Citation:
Dygert N.,Hirth G.,Liang Y.. A flow law for ilmenite in dislocation creep: Implications for lunar cumulate mantle overturn[J]. Geophysical Research Letters,2016-01-01,43(2).