板块绝对运动及地幔热对流

被引：23

作者：

傅容珊

林芬

黄建华

机构：

[1] 中国科学技术大学地球和空间科学系

[2] 中国科学技术大学地球和空间科学系合肥

[3] 合肥

来源：

地球物理学报 | 1992年 / 01期

关键词：

板块运动; 热对流; 地幔;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

本文以板块绝对运动AM1-2模型为边界条件探讨了不同的瑞利数下地幔热对流模型.结果表明,瑞利数小于10000(529.41)时,地幔对流呈现以板块驱动图式,运动的极型场和环型场由板块运动激发,两种场占有差不多相同的功率.当瑞利数增加到接近或略超过最低临界值时(约1.5倍),对流呈现出复杂状态:1.板块运动速率小于下伏地幔对流速率;2.区域性的双层对流环出现;3.对流谱成分发生变化;4.环型场仅在地幔很浅的区域中起作用,而在地幔深部对流图式中影响很小.

引用

页码：52 / 61

页数：10

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