羌塘盆地是中国海相中一上侏罗统最为发育的地区.本文对采自北羌塘盆地雁石坪地区侏罗系雁石坪群的沉积岩样品开展了系统热退磁和岩石磁学研究,其结果表明,中侏罗统雀莫错组(上、下段)主要载磁矿物为磁铁矿和赤铁矿;布曲组的主要磁性矿物是细颗粒磁铁矿;夏里组磁性矿物以磁铁矿为主;上侏罗统索瓦组以磁铁矿为主要载磁矿物.布曲组NRM远远高于其余各组(平均值为2.2×10~(-4)A/m)、索瓦组NRM次之(平均值为4.4×10~(-5)A/m)、雀莫错组和夏里组样品的NRM基本相当(平均值为2.2~2.4×10~(-5)A/m).本文认为细颗粒磁铁矿含量的增加可能是布曲组的NRM平均值远远高于索瓦组的主要原因,并且自生磁性矿(如针铁矿、铁的硫化物等)可能是引起布曲组、索瓦组NRM大于的雀莫错组和夏里组的原因之一.通过本研究与古水深和沉积相变化的对比分析,认为雁石坪地区中-上侏罗统磁性矿物组合变化主要受该区沉积环境变化的控制.本研究首次系统报道了羌塘盆地侏罗系雁石坪群各组的磁性矿物组成和组合规律,这将为羌塘盆地侏罗纪高精度磁性地层年代序列的建立以及特提斯沉积一构造演化等研究提供重要的依据. The Qiangtang Basin is the most developed region of the Middle Jurassic in the Chinese marine facies.In this paper, thermal demagnetization and rock magnetism studies of sedimentary rocks collected from the Yanshiping Group of the Jurassic in the Yanshiping area of ​​the North Qiangtang Basin were carried out. The results show that , The Middle Jurassic Cretaceous group (upper and lower) mainly contains magnetic minerals such as magnetite and hematite; the main magnetic minerals in Buqu Formation are fine-grained magnetite; the magnetic minerals of Xiali Formation are magnetite Mainly in the Upper Jurassic. The NRM of the Upper Jurassic group is mainly composed of magnetite, and the NRM in the Buqu group is much higher than that of the other groups (the average is 2.2 × 10 -4 A / m) NRM was the second (average was 4.4 × 10 -5 A / m), and NRM of the birds in the molluscan group and the summer group were almost the same (average was 2.2-2.4 × 10 -5 A / m) m) .In this paper, it is suggested that the increase of fine-grained magnetite content may be the main reason for the average NRM value of the Buqu Formation being far higher than that of the cablewa group, and the possibility of authigenic magnetites (such as goethite and iron sulfide) Is one of the causes for the Cretaceous and Suowa formations that lead to greater NRM in the Buqu and Suva groups.Based on the comparative analysis of paleo-water depth and sedimentary facies changes, it is concluded that the Middle-Upper Jurassic The change of the sex mineral assemblages is mainly controlled by the changes of sedimentary environment in this area.The magnetic mineral composition and assemblage of each group of the Yanshipiping Group of the Jurassic in the Qiangtang Basin were systematically and systematically reported for the first time, which will be the data of the Jurassic high-resolution magnetic strata in the Qiangtang Basin The establishment of sequence and Tethyan sedimentary-tectonic evolution provide an important basis for the study.