OSL Dating of Fault Collapse Wedge Using SAR Method: Taking the Xitian Trench of Xinding Basin, Shanxi as an Example

Abstract

Abstract:

In order to detect the degree of optically stimulated luminescence(OSL) signal bleaching of sediments in each sites of the fault collapse wedge and its formation age, a method of middle-grain single-aliquot regenerative-dose(SAR) procedure was used to implement OSL dating for the four samples from three sites of the fault collapse wedge in Xitian trench of Xinding basin, Shanxi. A representative sample was chosen to analyze the relationship among equivalent dose(D_E), L_N/T_N, recycling ratio, recuperation and preheat temperature. The results reveal that the aliquots need go through preheating at 260 ℃ for 10 s. For the four samples, the recycling ratio values of aliquots are almost between 0.9 and 1.1 and the recuperation values are below 5%, which indicates that the procedure of SAR method can successfully correct the OSL sensitivity change during measurement and the equivalent dose is creditable. The equivalent dose distribution and cumulation frequency of samples are analyzed; it can be found that the samples from palaeotopography surface and deluvium are bleaching equally and those from colluvium are worse. The approximate equivalent dose of the colluvium samples can be derived with cumulation frequency and at last, the formation age of this fault collapse wedge is measured as 27.09±0.71 ka.

Key words: fault collapse wedge, optically stimulated luminescence(OSL), single-aliquot regenerative-dose(SAR) method, equivalent dose, Xitian trench of Xinding basin

CLC Number:

P597

ZHAO Jun-Xiang,REN Jun-Jie,YU Shen-E, ZHANG Shi-Min,DING Rui. OSL Dating of Fault Collapse Wedge Using SAR Method: Taking the Xitian Trench of Xinding Basin, Shanxi as an Example[J]. Geoscience, 2011, 25(2): 356-362.

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