| DOI: | 10.1016/j.epsl.2020.116612
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| 论文题名: | The influence of sediment blanketing on subduction-zone seismicity |
| 作者: | McKenzie D.; Jackson J.
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| 刊名: | Earth and Planetary Science Letters
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| ISSN: | 0012821X
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| 出版年: | 2020
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| 卷: | 552 | | 语种: | 英语
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| 中文关键词: | oceanic lithosphere
; sediment blanketing
; seismicity
; subduction
; thermal evolution
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| 英文关键词: | Earthquakes
; Sedimentology
; Sediments
; Large earthquakes
; Lithospheric temperatures
; Low thermal conductivity
; Oceanic lithosphere
; Sedimentary covers
; Sedimentary layers
; Subduction zone seismicities
; Thermal modelling
; Thermal conductivity
; earthquake event
; oceanic crust
; oceanic lithosphere
; seismic zone
; seismicity
; subduction
; subduction zone
; thermal conductivity
; thermal evolution
; Aegean Sea
; Caspian Sea
; Mediterranean Sea
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| 英文摘要: | Subduction of oceanic lithosphere is now occurring beneath the Aegean and central Caspian Seas, and beneath the Indo-Burman Ranges in NE India, generating zones of earthquakes that reach depths of more than 150 km. Their existence is surprising. In general, where the temperature of the mantle part of the oceanic lithosphere can be estimated, earthquakes are confined to material whose temperature is below 600C∘. In these three regions the oceanic lithosphere is overlain by sediments with low thermal conductivity whose thickness is probably 10–25 km. The temperature of the oceanic crust and upper half of the lithosphere should be considerably increased by such a thick sedimentary cover, yet there is no obvious difference between these subduction zones and those where there is little sediment on the subducting plate. Detailed thermal modelling of the temperature shows that, for the first 40 Ma, the deposition of even a thick sedimentary layer has little effect on the thickness of the region of lithosphere whose temperature is below 600C∘, principally because little heat is conducted across the Moho. The modest effect of sediment blanketing over a period as long as 40 Ma was quite unexpected. Over the next 200 Ma the lithospheric temperature increases, until the Moho temperature reaches ∼600C∘. This behaviour has important implications for oil and gas generation in the sediments, and for the existence of large earthquakes at depths of 150 km or more beneath the Hindu Kush, Pamirs and Romania. © 2020 |
| 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/165155
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| Appears in Collections: | 气候变化与战略
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作者单位: | Bullard Laboratories of the Department of Earth Sciences, Madingley Road, Cambridge, CB3 0EZ, United Kingdom
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| Recommended Citation: | |
McKenzie D.,Jackson J.. The influence of sediment blanketing on subduction-zone seismicity[J]. Earth and Planetary Science Letters,2020-01-01,552
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