区域重力异常和上地幔小尺度对流相关方程及对流拖曳力场  

CORRELATION EQUATION BETWEEN REGIONAL GRAVITY ISOSTATIC ANOMALIES AND SMALL SCALE CONVECTION IN THE UPPER MANTLE

作　　者：傅容珊[1] 黄建华[1] 刘文忠[1] 常筱华[1] 

机构地区：[1]中国科学技术大学地球,空间科学系

出　　处：《地球物理学报》1994年第5期638-646,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金;中国科学院动力大地测量开放实验室资助

摘　　要：建立了区域重力均衡异常的物理模型，假定区域重力均衡异常源于上地幔密度分布横向不均匀以及由上地幔小尺度对流产生的边界形变．导出了区域重力均衡异常和上地幔小尺度对流之间的相关方程，讨论了该方程在地球动力学研究中的应用．应用几种模型计算上地幔小尺度对流产生的作用于岩石层底部的拖曳力场．结果表明，将这一相关方程用于利用区域重力均衡异常研究地壳及上地幔应力状态，将有广阔的前景．In this paper we establish a physical model of regional isotatic gravity anomalies by supposing that this kind of anomaly comes from the density heterogeneityand the boundary deformations causedby the small-scale convection in the upper mantle.Based on this idea,we obtained a correlation equation between regional gravity isostatic anomalies and small-scale convection in the upper mantle.We also make a general discussion about the applications of this correlation equation in studying of the geodynamics.As an example,we calculate some drag force models under the lithosphere generated by small-scale convection.The results show that the application of this correlation equation to the study of the stress state in the crust and upper mantle will have a good prospect.

关 键 词：重力异常 地幔对流 拖曳力场 地壳 

分 类 号：P542.5[天文地球—构造地质学]