globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116240
论文题名:
Seismological evidence for thermo-chemical heterogeneity in Earth's continental mantle
作者: Munch F.D.; Khan A.; Tauzin B.; van Driel M.; Giardini D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 539
语种: 英语
中文关键词: mantle thermo-chemistry ; mineral phase equilibrium calculations ; receiver functions ; surface wave dispersion
英文关键词: Geophysical prospecting ; Seismic response ; Continental mantle ; Fundamental control ; Mantle composition ; Mantle convection ; Phase equilibrium calculation ; Potential temperature ; Stable continental regions ; Thermo-chemical structures ; Seismic waves ; basalt ; data set ; harzburgite ; heterogeneity ; mantle convection ; petrology ; plate tectonics ; seismic data ; seismology ; subduction zone ; upper mantle ; volcanism
英文摘要: Earth's thermo-chemical structure exerts a fundamental control on mantle convection, plate tectonics, and surface volcanism. There are indications that mantle convection occurs as an intermittent-stage process between layered and whole mantle convection in interaction with a compositional stratification at 660 km depth. However, the presence and possible role of any compositional layering in the mantle remains to be ascertained and understood. By interfacing inversion of a novel global seismic data set with petrologic phase equilibrium calculations, we show that a compositional boundary is not required to explain short- and long-period seismic data sensitive to the upper mantle and transition zone beneath stable continental regions; yet, radial enrichment in basaltic material reproduces part of the complexity present in the data recorded near subduction zones and volcanically active regions. Our findings further indicate that: 1) cratonic regions are characterized by low mantle potential temperatures and significant lateral variability in mantle composition; and 2) chemical equilibration seems more difficult to achieve beneath stable cratonic regions. These findings suggest that the lithologic integrity of the subducted basalt and harzburgite may be better preserved for geologically significant times underneath cratonic regions. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165179
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作者单位: Institute of Geophysics, ETH Zurich, Switzerland; Institute of Theoretical Physics, University of Zurich, Switzerland; Laboratoire de Géologie de Lyon, Terre, Planètes, Environnement, Université de Lyon, Ecole Normale Supérieure de Lyon, CNRS, France; Research School of Earth Sciences, Australian National University, Australia

Recommended Citation:
Munch F.D.,Khan A.,Tauzin B.,et al. Seismological evidence for thermo-chemical heterogeneity in Earth's continental mantle[J]. Earth and Planetary Science Letters,2020-01-01,539
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