Northern China Desert - The Election Of The Loess System Frequency Of The Release Properties Of Light

The selected frequency luminescence is a new technology for meticulous study on the phenomenon of luminescence. The character of geological samples is determined by its composition crystal lattice structure. It is influenced by the geographical environment where the samples present. The instrument conditions and technical process of measurement should be defined before detecting the geographical environment information carried by geological samples. The characters include the dividing frequency receiving spectra, light wavelength statistic, wavelength of maximum photon counting, characteristic wavelength and extraordinary wavelength. The time-spatial difference is exhibited by the characters which represent the geographic properties of geographical object.Frequency luminescence characters index of surface on the deserts were got by measuring the samples from Horqin, Hushandake, Badain Jaran, Mu Us, Tengger and Hobq desert. The results showed that the frequency luminescence characters index of these deserts are different. And these characters can be used to represent the geographical properties.An environmental coupling system is composed by Loess and the deserts through the material relation. Information of falling dust in the period of late Pleistocene and Holocene is recorded by loess strata in the area of Xishan, Beijing. The result of measurement shows, there are some difference in the frequency luminescence characters index of different deserts, through the frequency luminescence test. Some luminescence photon with the special wavelength can be used to distinguish strata. Contrasted by the luminescence characters index of surface on the deserts, the samples of Malan Loess in Xishan area and the samples from Hobq are similar on the frequency luminescence characters index.The innovation of this study include:1. Applying the technique of selected luminescence for studying geography, and a new type of index system is established. 2. A set of measuring method is established through measuring the sample from the surface of deserts.3. Hobq desert is determined as the source of the material of dsut in Beijing area on the last glaciations period, through contrasting the selected frequency luminescence character from the sample of deserts and the strata in Xishan, Beijing.The result shows selected frequency luminescence technology can be used to distinguish geological samples which present different location or undergo time-spatial process. A new type of index is provided for geographical study. But as a new technology with potential of geosciences application, more study should be developed both in depth and width in the area of selected frequency luminescence.