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地球学报  2005 

地球旋转膨胀与冈瓦纳古陆裂解

DOI: 10.3975/cagsb.2005.03.01

Keywords: 地球,旋转,膨胀,地球动力学

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Abstract:

地球自转速度变慢说明地球在旋转的同时其体积在膨胀。这与红移现象等说明的宇宙膨胀是一致的。地球放射性物质的放射性能导致软流圈及塑性地核外核的形成。地球自转的惯性与地球塑性层的共同作用导致了地球的层间滑动。地球外圈应相对于内圈转动较慢。转动较快的内层层圈的运动方向为自西向东,或左旋剪切。即,软流圈之下的下地幔应相对于岩石圈自西向东转动较快;塑性地核外核之下的内核应相对于外核自西向东转动较快。在地球层圈之间的剪切力和地球放射性能所引起的热能的共同作用下,在软流圈产生物质的对流,形成地幔物质对流。推测地核的外核也可能会产生塑性物质的对流。地轴倾角ε的变化以及潮汐转矩和岁差转矩是地球动力学的重要因素。地球的旋转膨胀是板块运动的地球动力学基础,也是冈瓦纳古陆裂解的运动学基础。

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