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《Journal of Glaciolgy and Geocryology》 2000-04
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Study of ESR Dating of Quaternary Moraine, QilianMountains

SHIZheng tao 1, 2 , ZHANGShi qiang 1,ZHOUShang zhe 1,LIJi jun 1 (1.Resources and Enviroment College of Lanzhou University, LanzhouGansu 730000, China; 2. Cold and Arid Regions Environmental and Engineering Research Institute,CAS,LanzhouGan  
It is very difficult to dateglacial deposits. TL, U-series and 14 C dating methods, which are currently usingin Quaternary research, cannotbe used in paleo- moraine dating. Thus there is a great problem for glaciation research. There is a great deal of quartz grain in moraine, which is one of ESR dating materials. After it was buried, theradiation environment of moraine is mainly invariable, and freed from any thermodynamic and dynamical influence of tectonic activity. The study regions belong to continental glacier area, where glaciers flow slowly. The moraine had been exposed under solar radiation for a long time before it was buried. It is reported that signals of Ge center will disappear if a quartz sample is under solar radiation for an hour. Therefore moraine can be dated by means of ESR method. All samples were taken from Mount Lenglongling and Bailang River Basin in the Qilian Mountains, the northeast edge of the TibetanPlateau. The sampling sites are heavyrainfallareasof the Qilian Mountains, where a lot of Quaternary moraines exist. Ge center( g =1.9977) was selectedas calculating center, and the room temperature, X band wave, microwave power of 2mW, 0.1 modulation amplitude, and magnetic field of about 348±5mT were recorded. Linear correlationmethod was applied.Concentrationsof U, Th, K 2 O weredetermined by laser fluorescence, colorimetric spectrophotometerand atomic absorption technique, respectively. AD values were calculated following the method of Bell et al . and calibrated by water content. From the ESR dating and contrasted with TL、 14 Cage, it can be seenthat most of the determined agescoincide with the agesestimated fromstratigraphy geomorphology, except for Samples BL 1, BL 2 and LN 1, which are estimated younger than 5 000 a BP.The agesof the samples collected at different positions of a section are about the same, for example, the Samples LS 9 and LS 10. The age of Sample LS 5 coincides with the 14 Cageof black blue mud material in the same moraine. The age of SampleBL 4 coincideswith the TLageof the loess on the corresponding terrace. These show thatthe determined ages are reliable and credible. But the ESR method seemsnot available for samples younger than 5 000 a BP.
【Fund】: 国家重点自然科学基金!(497310 10 );; 教育部基金“祁连山冷龙岭地区第四纪冰川遗迹”资助
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