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Study on the K-Ar Dating of Diagenetic Illite in Sedimentary Rock Samples——Question and Discussion

Yan Zhang

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Abstract

The diagenetic I/S of P-T boundary in Changxing,Zhejiang province was dated using K-Ar method. The results show that the K-Ar ages of pure diagenetic L/S is younger than the age of the P-T boundary.The rea- sons for this result are that(1)the diagenetic illite in mudstone is formed through the sluggish smectite illitiza- tion,and(2)the loss of the radiogenic~(40)Ar exists in the fine clay minerals during the smectite illitization.

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What this paper is about

The diagenetic I/S of P-T boundary in Changxing,Zhejiang province was dated using K-Ar method. The results show that the K-Ar ages of pure diagenetic L/S is younger than the age of the P-T boundary.The rea- sons for this result are that(1)the diagenetic illite in mudstone is formed through the sluggish smectite illitiza- tion,and(2)the loss of the radiogenic~(40)Ar exists in the fine clay minerals during the smectite illitization.

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Available abstract

The diagenetic I/S of P-T boundary in Changxing,Zhejiang province was dated using K-Ar method. The results show that the K-Ar ages of pure diagenetic L/S is younger than the age of the P-T boundary.The rea- sons for this result are that(1)the diagenetic illite in mudstone is formed through the sluggish smectite illitiza- tion,and(2)the loss of the radiogenic~(40)Ar exists in the fine clay minerals during the smectite illitization.

Key concepts: Diagenesis, Illite, Geology, Radiogenic nuclide, K–Ar dating, Sedimentary rock, Clay minerals, Geochemistry

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