天水地区重力剖面测量结果与地壳结构

SURVEYING RESULTS OF GRAVITY PROFILES AND CRUSTAL STRUCTURES IN THE TIANSHUI AREA,GANSU

摘要:

本文介绍了1990年期间在天水地区的重力剖面测量结果,以及用多层变密度直接反演法得到的该区地壳密度分层结构。结果表明,除近地在的沉积层外,该区地壳在纵向上可分为上、中、下三层,其各层的平均密度为2.61、2.66、2.80g/cm³,各层底面的平均深度分别为16、28、45km,且各层在横向和纵向上变化都比较剧烈。

Abstract:

In this paper, the gravity profile survey in the Tianshui area in 1990 is introduced.The surveying results are calculated by direct inversion method of variable densities.In the area,the crustal structure, besides the sedimentary layers near surface,includes three layers,i.e. the up-per,middle and lower crusts with the average densities of 2.61,2.66 and 2.80 g/cm³, respectively.The average bottom depths are 16, 28 and 45 km respectively,and the layers have considerable variations in both lateral and vertical directions.