Paleomagnetism Of The Carboniferous Of Naqing Section In South China And Its Palaeogeographic Implications

Reliable Carboniferous paleomagnetic results play an important role in the study of the paleogeographic position of South China Block?SCB?in late Paleozoic,and the completion of Apparent Polar Wander Path?APWP?since the Phanerozoic.The Carboniferous stratum at the Nanqing Section of Luodian County in Guizhou Province is a series of continuous sedimentary carbonates of slope facies with rich and successive conodonts fossils,and a complete biostratigraphic constraint.The section is completely exposed without obvious structural deformation,which are favorable for paleomagnetic study of this section.In this paper,775 samples of 57 sampling sites were collected from the Visean to Gzhelian?346.8-298.9Ma?of the Carboniferous at the Naqing Section in the south of Guizhou Province.498 samples were conducted in systematic thermal demagnetization and thermal-alternating demagnetization.The representative samples were subjected to the rock magnetic experiments,including isothermal remanent magnetization acquirement,temperature dependence of magnetic susceptibility curves and Lowrie tests.The results of rock magnetism experiments show that the magnetic minerals in the samples are magnetite,with a small amount of hematite and goethite.It may contain titano-magnetite.The demagnetization result reveals that many samples have two components,and the direction of the high temperature characteristic?HTC?remanence is Ds=15.1°,Is=7.0°,?₉₅=2.7°after stratum correction.This high temperature component can pass the C class reversal test,and it is interpreted as a primary remanence.The corresponding paleomagnetic pole position is 63.9°N,250.3°E,A₉₅=2.3°.The paleolatitude of the South China Block during Carboniferous is calculated to be 3.6°,which is well consistent with the previous paleomagnetic study of the Middle and Late Carboniferous in the Guizhou region.A revised APWP since the Phanerozoic is completed by combining the reliable paleomagnetic poles with our new Carboniferous pole in South China Block.