Abstract: In terms of gravity and magenetic anomaly data,we have studied the features of the Moho and Conrad discontinuit as well as the structures of density and magnetism over the Tarim baisin. The results show that the depth of Moho and Conrad is 37～44km and 15～38km,respectively. These two interfaces rise and fall in a roughly consisitent manner. Their spatial distributions have two dominant directions of NW and NE. The structure of the crust and upper mantle is characterized by consistent variations with the shallow geology as well as the basement. The structures of density and magentism in the cover and the crystalline crust are quite inhomogeneous along the vertical direction and between tectonic zones of uplift and depression.

Key words: Bouguer gravity anomaly, Moho discontinuity, Conrad discontinuity, Tarim

摘要： 根据重力和磁力资料分析,研究了塔里木盆地的莫霍界面和康氏界面深度分布特征及地壳上地幔的密度和磁性结构。结果表明,盆地内部莫霍界面深度为37～44km,康氏界面深度为15～38km,两界面基本同步起伏,深度分布主要有NW和NE两个优势方向。地壳上地幔构造具有与浅部地质构造尤其是基底构造基本同步的特征。盖层和结晶地壳的密度和磁性结构在垂直方向以及隆起和坳陷构造带间,都存在明显的不均一性。

关键词: 布格重力异常, 莫霍间断面, 康腊德间断面, 塔里木