Thermoluminescent phenomenon resulting from two kinds of complicated geological situation

Ordos Basin and Huainan deposits in Anhui Province

is studied by the means of thermoluminscence counting method. It is shown that: (1) there are no apparent abnormalities of natural TL detected from the rock samples selected in the first 1000 meter depth of the Earth

and these natural TL are accumulated through natural radiation effects; (2) the natural TL shows statistically obvious reducing trends for the rock samples selected under the 2000 meter depth

and even no detectable TL is found for those rocks selected at 4000 meter depth. (3) the natural TL peaks corresponding to high temperature generally shift to the direction of higher temperature for the quartz-related rock samples

and several thermal events which occurred during the geological times might be responsible for this case.