DOI: 10.1038/ngeo2954
论文题名: The hottest lavas of the Phanerozoic and the survival of deep Archaean reservoirs
作者: Trela J. ; Gazel E. ; Sobolev A.V. ; Moore L. ; Bizimis M. ; Jicha B. ; Batanova V.G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 6 起始页码: 451
结束页码: 456
语种: 英语
Scopus关键词: Archean
; crystallization
; heterogeneity
; high temperature
; hot spot
; igneous province
; komatiite
; magma chamber
; mantle convection
; melting
; mid-ocean ridge
; Phanerozoic
; thermochemistry
英文摘要: Large igneous provinces and some hotspot volcanoes are thought to form above thermochemical anomalies known as mantle plumes. Petrologic investigations that support this model suggest that plume-derived melts originated at high mantle temperatures (greater than 1,500 °C) relative to those generated at ambient mid-ocean ridge conditions (about 1,350 °C). Earth's mantle has also cooled appreciably during its history and the temperatures of modern mantle derived melts are substantially lower than those produced during the Archaean (2.5 to 4.0 billion years ago), as recorded by komatiites (greater than 1,700 °C). Here we use geochemical analyses of the Tortugal lava suite to show that these Galapagos-Plume-related lavas, which formed 89 million years ago, record mantle temperatures as high as Archaean komatiites and about 400 °C hotter than the modern ambient mantle. These results are also supported by highly magnesian olivine phenocrysts and Al-in-olivine crystallization temperatures of 1,570 ± 20 °C. As mantle plumes are chemically and thermally heterogeneous, we interpret these rocks as the result of melting the hot core of the plume head that produced the Caribbean large igneous province. Our results imply that a mantle reservoir as hot as those responsible for some Archaean lavas has survived eons of convection in the deep Earth and is still being tapped by mantle plumes. © 2017 Macmillan Publishers Limited, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105775
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Geosciences, Virginia Tech, Blacksburg, VA, United States; Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France; Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 ul. Kosygina, Moscow, Russian Federation; School of Earth, Ocean, and Environment, University of South Carolina, Columbia, SC, United States; Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States
Recommended Citation:
Trela J.,Gazel E.,Sobolev A.V.,et al. The hottest lavas of the Phanerozoic and the survival of deep Archaean reservoirs[J]. Nature Geoscience,2017-01-01,10(6)