Lateral Motion of Mantle Plumes in 3‐D Geodynamic Models
Lateral Motion of Mantle Plumes in 3‐D Geodynamic Models
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DOI：
10.1029/2018gl081404
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发表时间：
2019-05
影响因子：
5.2
通讯作者：
Mingming Li;S. Zhong
中科院分区：
文献类型：
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作者：
Mingming Li;S. Zhong
有人提出，热点轨迹是由相对静止的热点上方移动的刚性板块引起的。然而，热点的固定性仍然存在争议。在这里，我们对无净旋转参考框架下平均速度为0 - 20mm /年的羽流进行了3‐D非常高分辨率（90%），并且有一小部分（~ 10-20%）羽流的横向运动小于5mm /年。地球动力学模拟结果与基于观测的运动学模型估计的近5ma热点运动在统计上有很好的一致性。我们的研究结果表明，大多数羽流引起的热点具有小到中等（0-20 mm/年）的横向运动。
It has been proposed that hot spot tracks are caused by moving rigid plates above relatively stationary hot spots. However, the fixity of hot spots remains under debate. Here, we perform 3‐D very high resolution (90%) of plumes move laterally with an average speed of 0–20 mm/year under the no‐net‐rotation reference frame, and there are a small portion (~10–20%) of plumes whose lateral motion is less than 5 mm/year. The geodynamic modeling results are statistically in a good agreement with the hot spot motions in the last 5 Ma estimated from observation‐based kinematic models. Our results suggest a small‐to‐moderate (0–20 mm/year) lateral motion of most plume‐induced hot spots.