摘要
内蒙古索伦镇-扎兰屯段重力梯级带属中国东部大兴安岭重力梯级带的一段,其地质成因存在不同观点。根据最新的区域重力资料,结合航磁及深部地质-地球物理资料,对该段重力梯级带的重磁场特征进行了分析和解释。结果表明,研究区重力场总体呈现西低东高、中间陡变(梯度大)的特点:磁场西部为低缓负磁场背景上的低变化磁场,中间重力梯级带为正磁场背景下的剧烈跳变强磁场,东部为以高幅度负磁场为主;重磁场的特征与本区构造单元的展布密切相关,重力梯级带的重磁场及地质特征尤为鲜明,该重力梯级带为大型断裂带系及深层构造带的地球物理场响应。
The gravitational gradient zone in Solon-Zalantun sector, Inner Mongolia is a sector of the Da Hinggan Mts. gravitational gradient zone in eastern China, its geological origin has different opinions. Based on down to date regional gravity data, combined with aeromagnetic and deep geologic-geophysical data carried out analysis and interpretation of gravitational gradient zone features of gravity and magnetic fields. Gravity field in the study area presents features of low in west, high in east, and middle part changed suddenly(larger gradient): western part of magnetic field is low varied magnetic field on a low and gentle negative magnetic field setting; middle part gravitational gradient zone is dramatically jumpy strong magnetic field on a positive magnetic field setting; eastern part is mainly high amplitude negative magnetic field. Features gravity and magnetic fields are closely related with structural elements extending in the area. Gravity and magnetic fields in the gravitational gradient zone and geological features are especially particular. The gravitational gradient zone is a response of large-sized faulted zone system and deep tectonic belt geophysical field.