The influence of reticulating process on characteristic remanence of red soil in southern Anhui Province
The red soil distributed in southern Anhui Province is formed from the subtropical aeolian deposits.Magne-tostratigraphic correlation is the main method to establish the temporal sequence of the red soil.However,the reliability is still controversial.In order to identify the influence of reticulating processes on the characteristic remanence,we carried out high-resolution magnetostratigraphic measurements on the Guantang section in Xuancheng.The results show the characteristic remanence in the homogeneous red soil layer is relatively stable,but unstable in the reticulated red soil layer.This finding indicates it is difficult to precisely draw the B/M boundary.The rock magnetism study illustrates that both type and content of magnetic minerals in the homogeneous red soil layer are not identical with that in reticulated red soil layer.On one hand,intense reticulating processes altered the primary magnetic minerals and resulted in quantitative decrease,on the other hand,many secondary magnetic minerals formed.Therefore,the detrital remanence is so severely interfered by the chemical remanence that the directions of characteristic remanence obtained in reticulated red soil using conventional methods are unreliable.The B/M boundary in reticulated red soil layer in southern Anhui Province needs to be reevaluated.This finding is significant for paleomagnetic dating of other reticulated red soil in South China.
reticulated red soilrock magnetismcharacteristic remanencereticulated processchemical weathering
国家科技期刊平台
NSTL
万方数据
维普
