DOI: 10.1016/j.epsl.2017.10.054
Scopus记录号: 2-s2.0-85033565587
论文题名: Seismic evidence for water transport out of the mantle transition zone beneath the European Alps
作者: Liu Z. ; Park J. ; Karato S.-I.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 93
结束页码: 104
语种: 英语
英文关键词: low velocity zone
; mantle transition zone
; receiver functions
; water transport
Scopus关键词: Mass transfer
; Melting
; Seismic prospecting
; Seismology
; Velocity
; 410-km discontinuity
; Correlation receivers
; Low velocity layers
; Low velocity zones
; Low-velocity anomaly
; Mantle transition zone
; Receiver functions
; Water transport
; Reservoirs (water)
; Alpine orogeny
; low velocity zone
; mantle structure
; seismic tomography
; seismic velocity
; transition zone
; Alps
; Europe
英文摘要: The mantle transition zone has been considered a major water reservoir in the deep Earth. Mass transfer across the transition-zone boundaries may transport water-rich minerals from the transition zone into the water-poor upper or lower mantle. Water release in the mantle surrounding the transition zone could cause dehydration melting and produce seismic low-velocity anomalies if some conditions are met. Therefore, seismic observations of low-velocity layers surrounding the transition zone could provide clues of water circulation at mid-mantle depths. Below the Alpine orogen, a depressed 660-km discontinuity has been imaged clearly using seismic tomography and receiver functions, suggesting downwellings of materials from the transition zone. Multitaper-correlation receiver functions show prominent ∼0.5–1.5% velocity reductions at ∼750–800-km depths, possibly caused by partial melting in the upper part of lower mantle. The gap between the depressed 660-km discontinuity and the low-velocity layers is consistent with metallic iron as a minor phase in the topmost lower mantle reported by laboratory studies. Velocity drops atop the 410-km discontinuity are observed surrounding the Alpine orogeny, suggesting upwelling of water-rich rock from the transition zone in response to the downwelled materials below the orogeny. Our results provide evidence that convective penetration of the mantle transition zone pushes hydrated minerals both upward and downward to add hydrogen to the surrounding mantle. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110102
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geology and Geophysics, Yale University, New Haven, CT 06511, United States
Recommended Citation:
Liu Z.,Park J.,Karato S.-I.. Seismic evidence for water transport out of the mantle transition zone beneath the European Alps[J]. Earth and Planetary Science Letters,2018-01-01,482