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K-Ar age of young volcanic rocks and excess argon

Binary mixing model and quantitative study of excess argon effect

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Chinese Science Bulletin

Abstract

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 ⩽ 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.

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Authors and Affiliations

  1. Institute of Geology, China Seismological Bureau, 100029, Beijing, China

    Darning Li, Wenji Chen & Qi Li

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  1. Darning Li
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  2. Wenji Chen
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  3. Qi Li
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Li, D., Chen, W. & Li, Q. K-Ar age of young volcanic rocks and excess argon. Chin.Sci.Bull. 45, 659–664 (2000). https://doi.org/10.1007/BF02886046

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  • DOI: https://doi.org/10.1007/BF02886046

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