Mantle plume heat flux and surface motion periodicities and their implications for the growth of continental crust
Mantle plume heat flux and surface motion periodicities and their implications for the growth of continental crust
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地幔羽流热通量和表面运动周期性及其对大陆地壳生长的影响
DOI：
10.1016/j.epsl.2023.118148
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发表时间：
2023
影响因子：
5.3
通讯作者：
Olson, Peter
中科院分区：
文献类型：
--
作者：
Li, Mingming;Puetz, Stephen;Condie, Kent;Olson, Peter
大约40%的地球表面被大陆地壳覆盖。研究发现，全球碎屑锆石年龄分布具有明显的多周期特征，从100Myr到∼800Myr，表明陆壳可能是周期性形成的。然而，是什么原因导致了陆壳的周期性增长，目前还不清楚。大陆地壳主要由俯冲带的弧形岩浆作用和热柱引起的岩浆作用产生。利用三维全球地幔对流模式，研究了地幔热柱热流和地表流速的长期演化，它们分别与地幔热柱引起的岩浆作用和弧岩浆作用有关。我们的模型中存在大约10-30个羽流，单个羽流的热通量在空间和时间上都有显著的变化。模式中总羽流热通量和地表速度均方根(RMS)的时间变化都具有随地幔对流强度减弱的周期性。当外推到与地球相似的对流强度时，羽流总热通量和地面速度的均方根值分别随∼90-200Myr和∼300Myr的周期变化。因此，全球碎屑锆石年龄分布所揭示的∼90-200Myr周期和∼300Myr周期可能分别是由热柱作用引起的岩浆作用和弧岩浆作用引起的。
About 40% of Earth's surface is covered by continental crust. It has been found that the global detrital zircon age distribution is dominated by multiple periodicities from <100 Myr to ∼800 Myr, suggesting that continental crust may have been produced periodically. However, what causes the periodic growth of continental crust remains unclear. Continental crust is produced mainly by arc magmatism at subduction zones and plume-induced magmatism. With 3D global mantle convection models, we investigate the long-term evolution of heat flux of mantle plumes and surface flow velocity, which can be respectively related to plume-induced magmatism and arc magmatism. About 10-30 plumes are present in our models, with significant spatial and temporal variations of heat flux for individual plumes. Both the temporal variations of the total plume heat flux and the root-mean-square (rms) of the surface velocity in our models have periodicities that decrease with the vigor of mantle convection. When extrapolated to conditions with Earth-like vigor of convection, the total plume heat flux and the rms of the surface velocity vary with periodic cycles of ∼90-200 Myr and ∼300 Myr, respectively. Therefore, the ∼90-200 Myr and the ∼300 Myr periodic cycles in the growth of continental crust as suggested by the global detrital zircon age distribution may be respectively caused by plume-induced magmatism and arc magmatism.
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影响因子：
5.3
作者：
C. O'Neill;A. Lenardic;Louis Moresi;T. Torsvik;Cin-Ty A. Lee
通讯作者：
C. O'Neill;A. Lenardic;Louis Moresi;T. Torsvik;Cin-Ty A. Lee
影响因子：
5.3
作者：
Li, Mingming;Zhong, Shijie
通讯作者：
Zhong, Shijie
脂肪羽可能反映了下地幔复杂的流变学
影响因子：
5.2
作者：
A. Davaille;Phillippe Carrez;P. Cordier
通讯作者：
P. Cordier
影响因子：
--
作者：
V. Solomatov;Louis Moresi
通讯作者：
Louis Moresi
混相粘性流体两层热对流中界面大变形
影响因子：
3.7
作者：
M. L. Bars;A. Davaille
通讯作者：
A. Davaille