断层崩积楔单片再生法光释光测年：以山西忻定盆地西田探槽为例

现代地质 ›› 2011, Vol. 25 ›› Issue (2): 356-362.

断层崩积楔单片再生法光释光测年：以山西忻定盆地西田探槽为例

赵俊香^1,2,任俊杰²,于慎谔²,张世民²,丁锐²

1.中国地质大学地球科学与资源学院，北京100083；2.中国地震局地壳应力研究所，北京100085

出版日期:2011-04-25 发布日期:2011-05-13
作者简介:赵俊香，女，助理研究员，博士研究生，1976年出生，地球化学专业，主要从事光释光测年的研究工作。 Email：zhjx@eq.icd.cn。
基金资助:
中国地震局地壳应力研究所基本科研业务专项(ZOJ2010-24, ZOJ2007-14, ZOJ2010-4); 地震行业科研专项(200908001，200708028)。

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

ZHAO Jun-Xiang^1,2,REN Jun-Jie²,YU Shen-E², ZHANG Shi-Min²,DING Rui²

1.School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China；
2.Institute of Crustal Dynamics, China Earthquake Administration, Beijing100085,China

Online:2011-04-25 Published:2011-05-13

摘要/Abstract

摘要：

为了研究断层崩积楔各部位沉积物光释光信号晒退情况及崩积楔形成年龄，利用中颗粒石英（63～90 μm）单片再生法（SAR）对山西忻定盆地西田探槽断层崩积楔3个部位的4个样品进行光释光（OSL）定年。选择一代表性样品（08-OSL-22）进行等效剂量(D_E)、L_N/T_N、循环比率、回授率与预热温度的关系分析，结果表明预热温度260℃、预热时间10_s为样品最佳预热条件。4个样品的测片循环比率基本在0.9～1.1之间，回授率均小于5%，表明所采用的中颗粒SAR法流程可以很好地校正测量过程中产生的释光感量变化，其等效剂量可信。利用等效剂量分布直方图和累积频率图，发现古地形面和坡积物的样品晒退均匀，崩积层样品则较差。对于晒退较差的样品利用累积频率法得到其等效剂量，从而得到崩积楔的近似年龄。最后获得该期崩积楔的形成年龄为(27.09±0.71) ka。

关键词: 断层崩积楔, 光释光, 单片再生法, 等效剂量, 忻定盆地西田探槽

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

中图分类号:

P597

赵俊香,任俊杰,于慎谔,张世民,丁锐. 断层崩积楔单片再生法光释光测年：以山西忻定盆地西田探槽为例[J]. 现代地质, 2011, 25(2): 356-362.

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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