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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
Based on the data obtained from the two gravity profiles of Argan - Mangyaoya and Golmud - Ejinaqi, the characteristics of the gravity field in the northern margin of the Qinghai-Tibet Plateau are studied. Five second-level tectonic units and eleven major faults are divided and the relationship between the gravity anomaly of Airy and the neotectonic movement in the study area is calculated and analyzed. According to the result of heavy earthquake joint inversion, the crust-upper mantle structure and density distribution are analyzed. It is pointed out that the deepest Moho boundary in the study area is 65km in Hala Lake area of Qinghai Province, and the shallowest Arjun in Xinjiang is only 39km. It is speculated that the middle Qilian fault and the Altyn Tagh fault in the North Qilian fold belt are the northern boundary of the Qinghai-Tibet Plateau