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DOI | 10.1038/s41561-017-0034-z |
Water-rich sublithospheric melt channel in the equatorial Atlantic Ocean | |
Mehouachi, Fares1; Singh, Satish C.1,2 | |
2018 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:1页码:65-+ |
文章类型 | Article |
语种 | 英语 |
国家 | France; Singapore |
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 degrees C and 1,355 degrees 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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423842000021 |
WOS关键词 | LITHOSPHERE-ASTHENOSPHERE BOUNDARY ; THERMAL STRUCTURE ; SEISMIC EVIDENCE ; MANTLE ; VOLATILES ; THICKNESS ; TRANSPORT ; STORAGE ; ORIGIN ; MODEL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35147 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Sorbonne Paris Cite, Equipe Geosci Marines, Inst Phys Globe Paris, CNRS,Paris Diderot, Paris, France; 2.Nanyang Technol Univ, Earth Observ Singapore, Singapore, Singapore |
推荐引用方式 GB/T 7714 | Mehouachi, Fares,Singh, Satish C.. Water-rich sublithospheric melt channel in the equatorial Atlantic Ocean[J]. NATURE GEOSCIENCE,2018,11(1):65-+. |
APA | Mehouachi, Fares,&Singh, Satish C..(2018).Water-rich sublithospheric melt channel in the equatorial Atlantic Ocean.NATURE GEOSCIENCE,11(1),65-+. |
MLA | Mehouachi, Fares,et al."Water-rich sublithospheric melt channel in the equatorial Atlantic Ocean".NATURE GEOSCIENCE 11.1(2018):65-+. |
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