近代喷发火山岩热释光测年研究  

A study on TL dating for recent eruptive volcanics

作　　者：计凤桔[1] 李建平[1] 郑荣章[1] 

机构地区：[1]中国地震局地质研究所中国地震局新年代学开放实验室,北京100029

出　　处：《核技术》2001年第12期980-983,共4页Nuclear Techniques

基　　金：中国地震局"九五"重点项目 (95 - 11)

摘　　要：为厘定天池火山近代喷发的时序 ,对碱流岩中的浮岩和透长石斑晶进行了热释光 (TL)信号热稳定性研究。结果表明 ,浮岩和透长石的TL信号具有良好的热稳定性 ,适用于TL测年。在此基础上 ,测定了天池火山 5 0 0 0a来 4次较大规模喷发事件的TL年龄 ,即 30 0— 35 0aB .P .左右、10 0 0aB .P .左右、35 0 0— 4 0 0 0aB .P .左右和 5 0 0 0aB .P .左右 ,其结果与历史记载和其它方法的测年结果在误差范围内吻合。In order to determine the time sequence of recent eruption in Tianchi volcano, the TL thermal-stability has been investigated for pumice and sanidine phenocryst within the volcanics. The results show that the TL signals of pumice and sanidine phenocryst have better thermal-stability, so they can be used for TL dating. Based on the research, the times of four eruptive events have been dated by TL method in the past 5000a, that is:300-350a B.P.±?1000a B.P.±?3500-4000a B.P.± and 5000a B.P.±. These results are consistent with the historical records of the volcanic eruption and other dating methods within the error range.

关 键 词：TL信号 热稳定性 天池火山 透长石斑晶 浮岩 近代喷发事件 长白山 热释光 火山岩 年代测定 

分 类 号：P588.14[天文地球—岩石学] P597[天文地球—地质学]