| 氯对40Ar-39Ar定年的制约及数据处理 |
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| 引用本文： | 王松山.氯对40Ar-39Ar定年的制约及数据处理[J].地质科学,1992,0(4):369-378. |
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| 作者姓名： | 王松山 |
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| 作者单位： | 中国科学院地质所, 北京 100029 |
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| 摘 要： | 核反应35Cl(n,γ)36Cl和37Cl(n,γ)38Cl的最终产物36Ar和38Ar,对40Ar-39Ar定年影响不可忽视,尤其是在测定某些含K量低的沉积成因矿物时更为重要。本文介绍含Cl样品的40Ar-39Ar定年技术及全部数据处理步骤,以及ppm级K、Ca、Cl含量的测定及计算方法。
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| 关 键 词： | 40Ar-39Ar 定年 氯的制约 坪年龄 等时年龄 C1/K比值 |
| 收稿时间： | 1991-04-01 |
| 修稿时间： | 1991-04-01; |
CONSTRAINTS OF CHLORINE ON ~(40)Ar/~(39)Ar DATING AND CALCULATION OF HIGH-PRECISE ~(40)Ar/~(39)Ar AGES |
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| Wang Songshan.CONSTRAINTS OF CHLORINE ON ~(40)Ar/~(39)Ar DATING AND CALCULATION OF HIGH-PRECISE ~(40)Ar/~(39)Ar AGES[J].Chinese Journal of Geology,1992,0(4):369-378. |
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| Authors: | Wang Songshan |
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| Institution: | Institute of Geology, Academia Sinica, Beijing |
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| Abstract: | Irradiation of naturally occuring Cl in a thremal neutron flux produces the reactions 35Cl(n,γ)36Cl and 37Cl(n,γ)38Cl, followed by β-decay to 36Ar and 38Ar, respectively. The half life of 38Cl is very short(37.3 minutes), while 36Cl has a long half life(-3.1×105 years). Therefore by the time of Ar analysis in a typical irradiation experiment a small amount of 36Ar is produced, while all the 38Cl has decayed to 38Ar. To assess the magnitude of 36Ar correction and also to obtain a high precise 40Ar/39Ar age, some formulas used to calculate F-value(5-2), plateau age and isochron age(8-1 to 8-9)are given in this paper. 38Ar production from Cl can be used for calculation of Cl concentration(11-1 to 11-7). These formulas are especially suitable for low-K and sedimentary minerals. |
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| Keywords: | ~(40)Ar/~(39)Ar dating chlorine plateau age isochron age C1/K ratio |
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