六盘山东麓断裂断层泥ESR测年研究  

ESR dating of fault gouge from the eastern Liupanshan piedmont fault zone

作　　者：高璐[1] 尹功明[1] 刘春茹[1] 韩非[1] 李建平[1] 

机构地区：[1]中国地震局地质研究所,地震动力学国家重点实验室,北京100029

出　　处：《核技术》2011年第2期121-125,共5页Nuclear Techniques

基　　金：地震行业应用基础研究--培育性项目(200708021)资助

摘　　要：断层泥是断层活动的信息载体。利用电子自旋共振(ESR)方法对采自六盘山东麓断裂带中的断层泥样品进行了测年研究,断层泥ESR年龄远大于野外地貌估计年龄。扫描电镜(SEM)显示断层泥中石英颗粒呈现不同微形貌,可能是断层多期次活动的结果。由于不能把不同期次形成的颗粒分开,也不能确定最后一次强烈活动能否使ESR信号完全回零,所以,断层泥ESR测年仍存在许多不定因素,还需要进行深入、系统地研究。Gouge is the carrier for information of the fault activity. In this study, fault gouges from the eastern Liupanshan piedmont fault zone were analyzed by ESR method. However, the measured ESR age is much older than that estimated in the field. On the other hand, SEM images of the quartz grains separated from the fault gouge showed a variety of morphologies, which indicate several periods of fault movements. The ESR age estimates failing to represent the latest fault movement suggest that the latest movement may not have zeroed ESR signals significantly for ESR dating and the quartz may be from different periods of the movements. Although there are still many uncertain factors in the ESR dating of fault gouge, it is essential to study systematically in this area.

关 键 词：ESR测年 断层泥 扫描电镜 六盘山断裂 

分 类 号：P597.3[天文地球—地球化学]