The Study On Permian-Triassic Boundary In Shangsi Section Of Guangyuan Area,Sichuan Province

In this paper,we focus on the typical geologic phenomena at the Permian Triassic boundary of Guangyuan Shangsi,Sichuan,and take some field survey sampling.We read the corresponding thickness of layers,and through the relationship between thickness and layer number,The Fourier transform is used to calculate the deposition cycle period at the Permian-Triassic boundary,which extends to the astrophysics,and calculates the corresponding solar days,the number of lunar nodes,the earth-moon orbital distance And the orbital parameters such as the lunar retreat rate,and compared with the orbital parameters of the present earth and moon,the evolution of the Earth-Moon orbit parameters of the Permian-Triassic is obtained.There are 14.42 lunar days per bi-weekly cycle,with 28.84 lunar days per lunar month and 29.7 solar days for each lunar month.The duration of each solar day at the boundary is 23.40 hours,Which is slightly shorter than that of the present 24 hours.The earth-moon distance is gradually increasing with the geological time,and the Earth-Moon distance is 60.12.The lunar receding rate is gradually decreasing with the geological time The lunar retreat rate at the boundary is about 3.9 cm / a.