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首页> 外文期刊>Geochemical Journal >SORI93 biotite: A new mineral standard for K-Ar dating
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SORI93 biotite: A new mineral standard for K-Ar dating

机译：SORI93黑云母：K-Ar约会的新矿物标准

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A new mineral standard for K-Ar dating, SORI93 biotite, has been prepared from the Sori Granodiorite in Gunma Prefecture, Japan. This is intended as a substitute of the existing standard, SORI biotite, which is well calibrated against international standards. The K2O and radiogenic Ar-40 contents for SORI93 biotite have been determined to be 8.16 +/- 0.04 (1 sigma) wt % and (25.0 +/- 0.1) x 10(-6) (1 sigma) cm(3)STP/g, respectively. The calculated K-Ar age is 92.6 +/- 0.6 Ma, which is about 1 million years older than that of SORI biotite. Chloritization up to 10% partly occur along cleavages of SORI93 biotite. In order to certify the homogeneity, K2O contents have been repeatedly analyzed for 100, 50, 20 and 10 mg aliquots. The analytical result of 100 mg SORI93 biotite shows a relative standard deviation similar to that of SORI biotite and the geochemical standards, JG-1 and JB-1. The standard deviations of aliquots less than 100 mg are about twice those of the three standards. This inhomogeneity may be caused by the presence of partially chloritized biotite. It is suggested to use 100 mg to ensure the homogeneity of subsamples. [References: 28]
机译：从日本群马县的Sori花岗闪长岩中制备了一种新的K-Ar约会矿物标准SORI93黑云母。它旨在替代现有标准SORI黑云母，它已根据国际标准进行了很好的校准。 SORI93黑云母的K2O和放射源Ar-40含量已确定为8.16 +/- 0.04（1 sigma）wt％和（25.0 +/- 0.1）x 10（-6）（1 sigma）cm（3）STP / g。计算得出的K-Ar年龄为92.6 +/- 0.6 Ma，比SORI黑云母大100万年。沿SORI93黑云母的裂解部分发生高达10％的氯化。为了证明同质性，已对100、50、20和10毫克等分试样的K2O含量进行了重复分析。 100 mg SORI93黑云母的分析结果显示相对标准偏差与SORI黑云母和地球化学标准品JG-1和JB-1相似。小于100毫克的等分试样的标准偏差约为这三个标准的两倍。这种不均匀性可能是由于存在部分氯化的黑云母引起的。建议使用100 mg以确保子样品的均质性。 [参考：28]

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