| DOI: | 10.1002/2015GL066246
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| 论文题名: | Thermal structure, radial anisotropy, and dynamics of oceanic boundary layers |
| 作者: | Auer L.; Becker T.W.; Boschi L.; Schmerr N.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8408
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| EISSN: | 1944-8139
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| 出版年: | 2015
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| 卷: | 42, 期:22 | | 起始页码: | 9740
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| 结束页码: | 9749
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| 语种: | 英语
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| 英文关键词: | Gutenberg discontinuity
; Lithosphere Asthenosphere Boundary (LAB)
; mantle
; radial anisotropy
; SS precursors
; surface waves
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| Scopus关键词: | Anisotropy
; Boundary layers
; Geodynamics
; Plates (structural components)
; Seismology
; Silicate minerals
; Surface waves
; Water waves
; Gutenberg discontinuity
; Lithosphere-asthenosphere boundary
; Mantle
; Radial anisotropy
; SS precursors
; Structural geology
; anisotropy
; asthenosphere
; azimuth
; bathymetry
; boundary layer
; discontinuity layer
; geodynamics
; isotropy
; mantle
; oceanic lithosphere
; olivine
; seismic reflection
; surface wave
; thermal structure
; wave dispersion
; wave velocity
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| 英文摘要: | Defining the oceanic lithosphere as a thermal boundary layer allows to explain, to first order, age-dependent bathymetry and isotropic wave speeds. In contrast, SS precursors and receiver functions suggest a subhorizontal interface within this layer, on top of a radially anisotropic zone. Comparing a suite of geodynamic scenarios against surface wave dispersion data and seismic discontinuities, we find that only weak age dependency of the radially anisotropic zone is compatible with observations. We show that this zone is confined from below by a second weaker seismic interface. While observed azimuthal anisotropy is consistent with lattice-preferred orientation of olivine due to asthenospheric flow underneath the lithosphere, radial anisotropy requires additional contributions, perhaps from petrological fabrics or melt ponding. This implies that seismic reflectors previously associated with the base of the lithosphere are instead associated with preserved structures embedded in it. They carry information about plate formation but have little control on plate deformation. Key Points Thermal control inconsistent with anisotropy structure and interfaces in the uppermost mantle Hypothesis tests imply that pure LPO is not an ideal model for radially anisotropic structure SPO due to partial melting or petrological fabrics better explain observations. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956956423&doi=10.1002%2f2015GL066246&partnerID=40&md5=698114bf01f4d70bfc2a541b84b31dbc
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8024
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Institut für Geophysik, Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland
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| Recommended Citation: | |
Auer L.,Becker T.W.,Boschi L.,et al. Thermal structure, radial anisotropy, and dynamics of oceanic boundary layers[J]. Geophysical Research Letters,2015-01-01,42(22).
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