globalchange  > 科学计划与规划
DOI: 10.1002/2016GL068560
论文题名:
Primordial metallic melt in the deep mantle
作者: Zhang Z.; Dorfman S.M.; Labidi J.; Zhang S.; Li M.; Manga M.; Stixrude L.; McDonough W.F.; Williams Q.
刊名: Geophysical Research Letters
ISSN: 0094-9083
EISSN: 1944-8814
出版年: 2016
卷: 43, 期:8
起始页码: 3693
结束页码: 3699
语种: 英语
英文关键词: chemical heterogeneities ; deep mantle ; LLSVPs ; magma ocean ; metallic melt ; noble gas
Scopus关键词: Inert gases ; Liquids ; Seismology ; Shear flow ; Chemical heterogeneities ; Deep mantles ; LLSVPs ; Magma ocean ; Metallic melts ; Metals ; crystallization ; heterogeneity ; hypothesis testing ; lower mantle ; mantle ; noble gas ; seismic tomography
英文摘要: Seismic tomography models reveal two large low shear velocity provinces (LLSVPs) that identify large-scale variations in temperature and composition in the deep mantle. Other characteristics include elevated density, elevated bulk sound speed, and sharp boundaries. We show that properties of LLSVPs can be explained by the presence of small quantities (0.3-3%) of suspended, dense Fe-Ni-S liquid. Trapping of metallic liquid is demonstrated to be likely during the crystallization of a dense basal magma ocean, and retention of such melts is consistent with currently available experimental constraints. Calculated seismic velocities and densities of lower mantle material containing low-abundance metallic liquids match the observed LLSVP properties. Small quantities of metallic liquids trapped at depth provide a natural explanation for primitive noble gas signatures in plume-related magmas. Our model hence provides a mechanism for generating large-scale chemical heterogeneities in Earth's early history and makes clear predictions for future tests of our hypothesis. ©2016. The Authors.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84968754916&doi=10.1002%2f2016GL068560&partnerID=40&md5=67cebaceb01df8754a54f3eb2e15f9a4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10046
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 Sciences, University of Minnesota, Minneapolis, MN, United States

Recommended Citation:
Zhang Z.,Dorfman S.M.,Labidi J.,et al. Primordial metallic melt in the deep mantle[J]. Geophysical Research Letters,2016-01-01,43(8).
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