Paleomagnetic secular variation and its influences on environment through the last 150 000 a

摘要: Loess-paleosol units S0, L1, S1 and L2, being in the Yangguo loess section, have been studied. Based on measurements of susceptibility grain size analyses nonlinear transform function between depth time has developed by using Simpson's integral, paleomagnetic secular variation records obtained through last 150 000 a. Some geomagnetic excursions or events, occurring 20600 - 19400, 29100 27130, 50700 40400, 63500 60400 127 200-124600a B.P., revealed. Spectral directional maximum entropy method show that main periods inclination direction are about 3000, 4000, 6800, 41 200, 2700, 3600, 4500 200 a, respectively. No obvious relativity can be observed environmental changes.