Research On Paleomagnetism Of Zharigen Layer In North Tanggula Mountain In Late Carboniferous To Early Permian

Through150sample from northern Tanggula mountain and sampling work, the paleomagnetic characteristic of Zharigen layer of northern Tanggula mountain in later carboniferous-early permian is carefully studied. Magnetite,hematite and magnetite-hematite are the three types of Magnetic minerals existed in the stratum. The systematically thermal demagnetization experiments, which cleaned every sample and applies center components anaylsis methods and average statistics standard by fisher to most sample demonstrates that demagnetization curve presents double components features. The Statistical analysis of sample C05and C06indicates that the gravels are wildly spread in the stereographic projection, which illustrate the stratum is not impacted by the effect of remagnetisation. The stratum of Zharugen thermal component pass the test of gravel, which represents the original residual information of rock.The average direction of originally residual magnetization in Zharigen layer is, Ds=29.6°, Is=-40.0°, ks=364.0, a95=2.0°, Correspondingly the position of paleomagnetic is λ=26.6°N, φ=241.7°E, dp/dm=2.4/1.4, this is the first paleopole of believable in the structure block, and paleolatitude is22.8°N.The conclusions from the comparison of structure features of qiangbei-changdu in later carboniferous-early Permian are presented as followed; later carboniferous-early permian changdu region located in northern latitude part and the changdu region wildly float toward north with anticlockwised40degree rotation.Qiangbei region anticlockwiedly rotated by40degree without evident polo shift.Due to the close in distance of Qiangbei and changdu regions, two regions collided in the early time of Late Paleozoic to early Mesozoic.