亚东格尔木地学断面的磁结构

THE MAGNETIC STRUCTURE OF GEOSCIENCE TRANSECT FROM YADONG TO GOLMUD

本文介绍了亚东—格尔木长磁剖面测制过程;断面的垂向视磁化强度填图的方法、技术要点,通过计算得出了亚东—格尔木地学断面的等效深度内的视磁化强度值,根据ΔJ=J-J值将其分为5类地区;文内对地壳磁层上下界面进行了计算,并与重磁进行了对应分析;最后提出了地壳磁结构地质模型及几点重要的认识。

The magnetic profile from Yadong, Xizang to Golmud, Qinghai, with an overall length of 1,619km, is presented in this paper. The measured anomaly is normally corrected based on the International Geomagnetic Reference Field 1985.0(IGRF 1985.0)model, and the result is compared with the anomalies corrected based on the IGRF 1980.0 model and a three order power series model. Using this magnetic data, the mapping of vertical magnetic susceptibility and the calculating of depths to the top and bottom of the crust magnetic layer in the transect are carried out. Then with the interactive modelling technique, the magnetic structure of the geoscience transect from Yadong to Golmud was derived, and its geological significance is discussed.