DOI: 10.1016/j.epsl.2018.05.050
Scopus记录号: 2-s2.0-85048401803
论文题名: A long-lived Indian Ocean slab: Deep dip reversal induced by the African LLSVP
作者: Wang H. ; Wang Y. ; Gurnis M. ; Zahirovic S. ; Leng W.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 497 起始页码: 1
结束页码: 11
语种: 英语
英文关键词: LLSVPs
; mantle convection
; slab morphology
; subducted slab dynamics
; upwelling mantle flow
Scopus关键词: Geodynamics
; Piles
; Seismology
; LLSVPs
; Mantle convection
; Mantle flow
; Slab dynamics
; Slab morphology
; Tectonics
; anomaly
; geodynamics
; Jurassic
; mantle convection
; seismic tomography
; seismic velocity
; slab
; subduction
; Triassic
; Indian Ocean
英文摘要: A slab-like high seismic velocity anomaly (referred as SEIS) has been inferred beneath the central-southern Indian Ocean in a recent tomographic inversion. Although subduction has previously been suggested regionally by surface observations, the new inversion is consistent with a north-dipping slab extending from the upper mantle to the core mantle boundary (CMB). We propose that SEIS anomaly originated from an oceanic plate in the Paleo-Tethys that was consumed by a south-dipping intra-oceanic subduction zone during the Triassic and Jurassic periods. SEIS challenges traditional concepts of the dynamics of slab descent by its relatively shallow depths and a present-day polarity opposite to the geometry of subduction. Geodynamic models show the upwelling mantle flow exerted by a thermochemical pile can hold and stagnate the descending SEIS slab at shallow depths for more than 100 Myr. The spatial distribution of resistance from the upwelling mantle flow can reverse the slab dip, producing a structure consistent with seismic inversions as well as with our proposed tectonic scenario and geology constraining the Tethyan tectonic domain. The results suggest that slabs can descend through the lower mantle at rates substantially lower than 1 cm/yr, and even reverse their polarity through interactions with background mantle flow. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109772
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: Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, United States; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; EarthByte Group, School of Geosciences, University of Sydney, NSW, 2006, Australia; Institute of Geophysics, MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan, China; Department of Geology, University of Illinois, Urbana, IL 61801, United States
Recommended Citation:
Wang H.,Wang Y.,Gurnis M.,et al. A long-lived Indian Ocean slab: Deep dip reversal induced by the African LLSVP[J]. Earth and Planetary Science Letters,2018-01-01,497