globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-00653-5
论文题名:
Distinct slab interfaces imaged within the mantle transition zone
作者: Wang X.; Chen Q.-F.; Niu F.; Wei S.; Ning J.; Li J.; Wang W.; Buchen J.; Liu L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:12
起始页码: 822
结束页码: 827
语种: 英语
英文关键词: asthenosphere ; mantle ; Moho ; oceanic lithosphere ; partial melting ; slab ; subduction zone ; transition zone ; waveform analysis ; Pacific Ocean ; Pacific Ocean (West)
英文摘要: Oceanic lithosphere descends into Earth’s mantle at subduction zones and drives material exchange between Earth’s surface and its deep interior. The subduction process creates chemical and thermal heterogeneities in the mantle, with the strongest gradients located at the interfaces between subducted slabs and the surrounding mantle. Seismic imaging of slab interfaces is key to understanding slab compositional layering, deep-water cycling and melting, yet the existence of slab interfaces below 200 km remains unconfirmed. Here, we observe two sharp and slightly dipping seismic discontinuities within the mantle transition zone beneath the western Pacific subduction zone that coincide spatially with the upper and lower bounds of the high-velocity slab. Based on a multi-frequency receiver function waveform modelling, we found the upper discontinuity to be consistent with the Mohorovičić discontinuity of the subducted oceanic lithosphere in the mantle transition zone. The lower discontinuity could be caused by partial melting of sub-slab asthenosphere under hydrous conditions in the seaward portion of the slab. Our observations show distinct slab–mantle boundaries at depths between 410 and 660 km, deeper than previously observed, suggesting a compositionally layered slab and high water contents beneath the slab. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169695
Appears in Collections:气候变化与战略

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作者单位: Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China; Department of Earth, Environmental and Planetary Sciences, Rice University, Houston, TX, United States; State Key Laboratory of Petroleum Resources and Prospecting, and Unconventional Petroleum Research Institute, China University of Petroleum at Beijing, Beijing, China; Earth Observatory of Singapore, Nanyang Technological University, Singapore, Singapore; Asian School of Environment, Nanyang Technological University, Singapore, Singapore; School of Earth and Space Sciences, Peking University, Beijing, China; Institute of Earthquake Forecasting, China Earthquake Administration, Beijing, China; Department of Geology, University of Illinois Urbana-Champaign, Urbana, IL, United States

Recommended Citation:
Wang X.,Chen Q.-F.,Niu F.,et al. Distinct slab interfaces imaged within the mantle transition zone[J]. Nature Geoscience,2020-01-01,13(12)
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