| DOI: | 10.1002/2014GL061251
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| 论文题名: | Slab rollback instability and supercontinent dispersal |
| 作者: | Bercovici D.; Long M.D.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9713
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| EISSN: | 1944-9444
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| 出版年: | 2014
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| 卷: | 41, 期:19 | | 起始页码: | 6659
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| 结束页码: | 6666
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| 语种: | 英语
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| 英文关键词: | slab rollback
; Wilson cycle
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| Scopus关键词: | Tectonics
; Equilibrium state
; Internal heating
; slab rollback
; Subducting slabs
; Subduction zones
; Supercontinents
; Theoretical modeling
; Wilson cycle
; Stability
; heating
; instability
; slab
; subduction
; subduction zone
; supercontinent
; tectonic structure
; trench
; upwelling
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| 英文摘要: | Supercontinents coalesce over subduction zone complexes and their subsequent dispersal is usually attributed to heating and upwelling of continent-insulated mantle. This dispersal mechanism, however, requires considerable mantle internal heating. Alternatively, the supercontinent configuration may be mechanically unstable and disperse regardless of heating mode. In particular, increased drag on plates or subducting slabs (e.g., by accumulating continents) causes them to slow down and trenches to rollback. Once subcontinental slabs are slightly separated, resistance to their descent increases, inducing further trench migration. Slabs thus undergo a rollback instability, which disperses supercontinents. A simple theoretical model illustrates this instability and shows that there are two equilibrium states, one unstable supercontinent state where slabs are conjoined and one stable state where slabs are widely separated. Slab rollback from the unstable to stable states occurs at typical slow tectonic speeds and over a period commensurate with the age of ocean basins and the Wilson cycle. Key Points Supercontinent clusters of subducting slabs are unstable to rollbackThe slab rollback instability disperses continentsThe dispersal time is commensurate with the Wilson cycle period ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911390266&doi=10.1002%2f2014GL061251&partnerID=40&md5=eec9b9774176163804c297a440db0636
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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/6977
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Geology and Geophysics, Yale University, New Haven, CT, United States
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| Recommended Citation: | |
Bercovici D.,Long M.D.. Slab rollback instability and supercontinent dispersal[J]. Geophysical Research Letters,2014-01-01,41(19).
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