K-Ar age of young volcanic rocks and excess argon - Binary mixing model and quantitative study of excess argon effect

被引:6
作者
Li, DM [1 ]
Chen, WJ [1 ]
Li, Q [1 ]
机构
[1] China Seismol Bur, Inst Geol, Beijing 100029, Peoples R China
来源
CHINESE SCIENCE BULLETIN | 2000年 / 45卷 / 07期
关键词
young volcanic rock; K-Ar age; excess argon; binary mixing model;
D O I
10.1007/BF02886046
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A binary mixing model for excess argon is suggested in the note. According to this model and the data of excess argon component obtained in our experiment, a quantitative study of the effect of excess argon on real K-Ar age of young volcanic rocks is done. The result indicates that the effect of 5% excess argon component in samples on K-Ar age of the samples more than 2 Ma is less than 7.36% and can lead K-Ar age of 0.5 Ma samples to increase by 32.4%, while 1% excess argon component leads K-Ar age of 0.5 Ma samples to increase by 6.26%. Therefore, when pre-processed excess argon component is less than or equal to 1%, K-Ar age of the samples more than 0.5 Ma should be credible. On this basis we suggest a principal opinion for evaluation of previous K-Ar dating results and propose that the matrix is used to determine K-Ar age of young volcanic rocks. For the samples less than 0.2 Ma, in the case of high excess argon content, even if only 1% excess argon component exists in their matrix, it can also greatly affect their K-A age. Thus it must be careful to treat the dating result.
引用
收藏
页码:659 / 664
页数:6
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