DOI: 10.1002/grl.50151
论文题名: Mantle temperature under drifting deformable continents during the supercontinent cycle
作者: Yoshida M.
刊名: Geophysical Research Letters
ISSN: 0094-9286
EISSN: 1944-9017
出版年: 2013
卷: 40, 期: 4 起始页码: 681
结束页码: 686
语种: 英语
英文关键词: continent
; mantle convection
; mantle plume
; mantle temperature
; numerical simulation
; supercontinent cycle
Scopus关键词: Computer simulation
; Deformation
; Structural geology
; Tectonics
; continent
; Mantle convection
; Mantle plume
; Mantle temperatures
; Supercontinents
; Three dimensional computer graphics
; deformation
; Earth
; heterogeneity
; insulation
; mantle
; mantle plume
; seafloor
; simulation
; supercontinent
; thermal convection
; upwelling
英文摘要: The thermal heterogeneity of the Earth's mantle under the drifting continents during a supercontinent cycle is a controversial issue in earth science. Here, a series of numerical simulations of mantle convection are performed in 3-D spherical-shell geometry, incorporating drifting deformable continents and self-consistent plate tectonics, to evaluate the subcontinental mantle temperature during a supercontinent cycle. Results show that the laterally averaged temperature anomaly of the subcontinental mantle remains within several tens of degrees (±50°C) throughout the simulation time. Even after the formation of the supercontinent and the development of subcontinental plumes due to the subduction of the oceanic plates, the laterally averaged temperature anomaly of the deep mantle under the continent is within +10°C. This implies that there is no substantial temperature difference between the subcontinental and suboceanic mantles during a supercontinent cycle. The temperature anomaly immediately beneath the supercontinent is generally positive owing to the thermal insulation effect and the active upwelling plumes from the core-mantle boundary. In the present simulation, the formation of a supercontinent causes the laterally averaged subcontinental temperature to increase by a maximum of 50°C, which would produce sufficient tensional force to break up the supercontinent. The regular periodicity of the supercontinent cycles observed in previous 2-D and 3-D simulation models with rigid nondeformable continents and without self-consistent plate tectonics is not confirmed. Key Points Numerical simulations of 3D mantle convection with continents are performed Temperature difference between continental and oceanic mantles is quite small Supercontinent causes the subcontinental temperature to increase by <50 degrees ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878179628&doi=10.1002%2fgrl.50151&partnerID=40&md5=37903591a469646f6b9fd05a10af8473
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6550
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
Recommended Citation:
Yoshida M.. Mantle temperature under drifting deformable continents during the supercontinent cycle[J]. Geophysical Research Letters,2013-01-01,40(4).