Seminar

Chinese Loess Plateau (CLP) is one of the most important climate archives in the world. Model chronology of the CLP was obtained by tuning the climate records according to the eccentricity, obliquity, precession of the Earth`s orbit. The assumption behind the tuning was that the loess accumulation in the CLP was continuous. Recently, several studies with optically stimulated luminescence (OSL) dating on the loess sequence indicated deposition hiatus with several thousands of years. We performed OSL dating with high resolution and found an age hiatus of ~15 ka. However, after examining the dose rates, we suggested that the age hiatus was not a virtually deposition hiatus. It was a result of underestimation of the samples` dose rates below the hiatus, which was caused by the carbonate leaching and re-precipitation process.