【摘要】 根据实测阿尔干—老茫崖、格尔木—额济纳旗两条重力剖面获得的资料 ,研究了青藏高原北缘重力场特征。划分出 5个二级构造单元及 11条较大断裂 ,计算并分析了研究区内Airy重力均衡异常与新构造运动的关系。利用重震联合反演结果 ,浅析了地壳—上地幔构造及密度分布特点 ,指出研究区内莫霍界面最深处在青海哈拉湖地区 ,达 65km ,新疆阿尔干最浅 ,只有 39km。推测北祁连褶皱带中的中祁连断裂及阿尔金断裂系是青藏高原块体的北界更多还原

【Abstract】 Based on the gravity field characteristics along Algan Laomangya and Golmud Ejin Banner geoscience Transections as well as the relevant geological data, the authors have divided the study area into five second order tectonic units with eleven relatively large faults, calculated and analysed Airy isostatic anomalies and Moho depth. It is inferred that the Central Qilian fault in the Altun fold system is the northern boundary of Qinghai Tibet plateau.更多还原