全球地幔密度异常及其构造意义

摘要

We inverted global six-density anomalies by means of damp least square method on different depth of the mantle using medium-long waves geoid anomaly deducted the effects of topography,Moho and Core-Mantle boundary interfaces.The relation between global density anomalies and plate tectonics is discussed.And the action of density anomalies to plate moving is analyzed also.The density anomalies result shows that there are two principal density anomalies centers,one is locate on 80°E,0°N and the other is locate on 240°E,10°N.%利用扣除地形、莫霍面和核幔边界起伏影响的中长波大地水准面异常和全球地震层析成像资料，采用阻尼最小二乘方法反演计算了全球地幔6个不同层面上的密度异常分布。分析了全球密度异常与板块构造的关系，探讨了全球密度异常分布对板块运动的作用。全球地幔密度异常结果表明存在两个主要的密度异常中心：一个位于东经80°，北纬0°；另一个位于东经240°，北纬10°附近。