DOI: 10.1038/s41561-017-0034-z
论文题名: Water-rich sublithospheric melt channel in the equatorial Atlantic Ocean
作者: Mehouachi F. ; Singh S.C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期: 1 起始页码: 65
结束页码: 69
语种: 英语
Scopus关键词: asthenosphere
; isotherm
; lithosphere
; mantle convection
; melt
; oceanic lithosphere
; seismic data
; seismic reflection
; Atlantic Ocean
; Atlantic Ocean (Equatorial)
英文摘要: The lithosphere-asthenosphere boundary is the most extensive boundary on Earth, separating the mobile plate above from the convecting mantle below, but its nature remains a matter of debate. Using an ultra-deep seismic reflection technique, here we show a systematic seismic image of two deep reflectors that we interpret as the upper and lower limits of the lithosphere-asthenosphere boundary beneath a 40-70-million-year-old oceanic lithosphere in the Atlantic Ocean. These two reflections correspond to 1,260 °C and 1,355 °C isotherms and bound a low-velocity channel, suggesting that the lithosphere-asthenosphere boundary is thermally controlled. We observe a clear age dependency of this sublithospheric channel: its depth increases with age from 72 km where it is 40-Myr-old to 88 km where it is 70-Myr-old, whereas its thickness decreases with age from 18 km to 12 km. We suggest that partial melting, facilitated by water, is the main mechanism responsible for the low-velocity channel. The required water concentration for melting increases with age; nevertheless, its corresponding total mass remains relatively constant, suggesting that most of the volatiles in the oceanic sublithospheric channel originate from a horizontal flux near the ridge axis. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105637
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: Equipe de Géosciences Marines, Institut de Physique du Globe de Paris, CNRS, Paris Diderot, Sorbonne Paris Cité, Paris, France; Earth Observatory of Singapore, Nanyang Technological University, Singapore, Singapore
Recommended Citation:
Mehouachi F.,Singh S.C.. Water-rich sublithospheric melt channel in the equatorial Atlantic Ocean[J]. Nature Geoscience,2018-01-01,11(1)