Abstract
Electron paramagnetic resonance (EPR) spectroscopy in combination with thermal methods were used to identify and characterize Mn2+ in the Chinese loess that is a multimineral system. EPR spectra of the loess samples from the classic loess-paleosol section in central China show the presence of trace amounts of Mn2+; whereas paleosol samples present no Mn2+ EPR signal. The spectral changes upon step heating from room temperature to 1000 °C suggest that this EPR signal in the loess arises from Mn substituted into CaCO3. This study provides a direct evidence that the loess-paleosol profiles were formed under the changing redox conditions caused by a past climatic change.
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