Sedimentological Significance of the Magnetic Fabric of the Neogene Red Clay in Lingtai, Gansu Province

Key words: 
• Lingtai /
• red clay /
• magnetic fabric /
• genesis

Abstract: The analysis of magnetic fabric of the Malan loess, the fifth layer of paleosol which is wellknown for its intensity of weathering and pedogenesis, red clay and matrix indicates that the magnetic fabric parameters P, F of Neogene Red Clay are between Malan loessthe fifth layer of paleosol and matrix with the overlapping boundary as the equation "F=1.01". The average value of L is equal to that of the eolian loess while the average value of Q, which is similar to that of the eolian Malan loess from the aspect of event deposition, approximately corresponds with that of the matrix red clay of hydraulic genesis and is in the transition area when it is in the assembled diagram of magnetic fabric parameters. All above show that the red clay deposits have the similar characters of magnetic fabric values resembling those of eolian deposits without experiencing transportation and also the features of shrouding rock of the fossils undergoing the hydraulic reconstruction thus the conclusion can be reached that red clay is the product of the primary aeolian particles which go through the postdepositional hydraulic process.