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板块构造受控于集中在板块边界的推动力和阻力,然而由观测资料所约束的高精度全球地幔流模型仍面临着计算上的挑战。我们利用最新的自适应网格细化算法,将板块边界的分辨尺度下降到1km,通过分析相接板块的运动,在并行计算机上模拟全球地幔流。在上地幔中,当消减板块向下俯冲时,往往会产生弧后扩张和板片回退现象。下地幔中冷的热异常通过狭窄的高粘性的板块与洋壳相耦合,导致洋壳运动速度的下降。在海沟区域,弯曲岩石层内的粘性耗散占整个岩石层和地幔总耗散的5%至20%。
Plate tectonics are dominated by thrust and drag concentrated on plate boundaries, however, the high-precision global mantle flow model constrained by observations still faces computational challenges. We use the latest adaptive mesh refinement algorithm to reduce the resolution scale of plate boundaries to 1km and simulate global mantle flow on parallel computers by analyzing the motion of the phase plate. In the upper mantle, when the subduction plate subducts downward, it tends to produce post-arc dilation and plate regression. The thermal anomalies in the lower mantle are coupled to the oceanic crust through a narrow, highly viscous plate, resulting in a decrease in the velocity of the oceanic crust. In the trench area, viscous dissipation within the curved rock layer accounts for 5% to 20% of the total dissipation of the entire rock layer and mantle.