A New Reference Model for the Evolution of Oceanic Lithosphere in a Cooling Earth
A New Reference Model for the Evolution of Oceanic Lithosphere in a Cooling Earth
复制标题
冷却地球中海洋岩石圈演化的新参考模型
DOI:
10.1029/2020jb021528
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Yamano, Makoto
中科院分区:
文献类型:
--
作者:
Korenaga, Tomoko;Korenaga, Jun;Kawakatsu, Hitoshi;Yamano, Makoto
We present a new reference model for the evolution of oceanic lithosphere, which incorporates the effects of incomplete viscous relaxation, radiogenic heating, and secular cooling. The new reference model is based solely on thermal conduction, that is, without involving the occurrence of small‐scale convection, and unlike the plate model, it does not contain unphysical boundary conditions. Yet, our model can explain both bathymetry and the heat flow data on the normal seafloor. The success of the new model owes to the use of realistic material properties in conduction modeling as well as the consideration of all of major processes that take place ubiquitously beneath seafloor. The effect of secular cooling on the bathymetry of old seafloor is particularly notable. Whereas secular cooling brings only weak temperature variations with an amplitude of ∼20 K, it can nonetheless affect global bathymetry substantially owing to the deep sensitivity of long‐wavelength topography kernels. We suggest that the well‐known fact that Earth has been cooling, which was not considered in any of previous reference models, may be the key to the long‐standing puzzle of seafloor flattening. The new reference model is expected to be useful to better quantify the impact of the emplacement of hotspot islands and oceanic plateaus, the effect of small‐scale convection, and the regional history of secular cooling in the convecting mantle.
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DOI:
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发表时间:
2003
期刊:
影响因子:
--
作者:
J. Lowman;S. King;C. Gable
通讯作者:
C. Gable
DOI:
--
发表时间:
2020
期刊:
Journal of Geophysical Research: Solid Earth
影响因子:
--
作者:
Xiaoyu Yuan;J. Korenaga;W. Steven Holbrook;Peter B. Kelemen
通讯作者:
Peter B. Kelemen
影响因子:
5.3
作者:
C. Cadio;J. Korenaga
通讯作者:
J. Korenaga
影响因子:
5.3
作者:
DAVIS, EE;LISTER, CRB
通讯作者:
LISTER, CRB
DOI:
--
发表时间:
1985
期刊:
影响因子:
--
作者:
U. Christensen
通讯作者:
U. Christensen