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陕西省,尤其是秦岭地区处于中国南北构造和东西构造的交汇部位,是中国地壳五大块体中的青藏块体、塔里木块体、华南块体和华北块体的分界部位,其地壳结构和地质构造都十分复杂。因此,利用区域地球物理场对陕西省深部构造进行研究十分必要。一、方法上地幔与地壳之间存在着一个物质界面—莫霍洛维奇不连续面,简称莫霍面。它可引起相当可观的重力异常。因此,由区域重力异常,通过反演计算可以获得莫霍面的起伏变化和地壳视厚度值。按王懋基等采用的方法,本文用40×40公里网格计算平均重力异常,用
Shaanxi Province, especially the Qinling Mountains, is located at the junction of north-south tectonics and east-west structures in China. It is the boundary between the Qinghai-Tibet block, the Tarim block, the South China block and the North China block in the five blocks of China’s crust. Its crustal structure and geology Construction is very complicated. Therefore, the use of regional geophysical field of deep structure in Shaanxi Province is necessary. First, the method There is a material interface between the mantle and the crust - the Moho Rocky discontinuity, referred to as Moho. It can cause considerable weight anomalies. Therefore, from the regional gravity anomaly, the ups and downs of the Moho and the crustal thickness can be obtained by inversion calculation. By Wang Maoji and other methods used in this paper with 40 × 40 km grid average gravity anomalies, with