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.
出处
《核技术》
CAS
CSCD
北大核心
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)
