TL dating of malan loess in gansu province |
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Authors: | Liangcai Lu Huhou Li |
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Institution: | (1) Institute of Geochemistry, Academia Sinica, China;(2) Institute of Archaeology, the Chinese Academy of Social Sciences, China |
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Abstract: | TL dating technique is of great advantage for determining the initial time of storing energy (T0) in an object to be analyzed. The sample is required to have undergone at least one thermal event, permitting all the residual
storage to release. As a result, TL dating technique has found wide application in geochronology of pottery. The determination
of T0 of loess is mainly based on the fact that fine particles of which loess is composed will lose their storage in the process
of transportation by wind.
In our experiment TL dating technique was adopted to determine the ages of fine quartz grains, and the results were corrected
for those of shine-fading experiment.
TL dating of Malan loess specimens from Mt. Gaolanshan, Liugouhe near Lanzhou, Mt. Qijiadashan in Jingning and Baichaoyuan
in Huining gave the age values of 2.6±0.1, 3.6±0,3. 4.7±0.5 and 10.0±0.6×104 yr, respectively. The values indicate that the Malan loess began depositing in Late Pleisotocene, but the initial time and
acumulation rate are different under different morphological conditions from place to place. |
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