甘肃北山前红泉金矿床绢云母40Ar-39Ar年龄及其地质意义
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丁书宏
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40Ar-39Ar Age of Sericite and Its Geological Significance in Qianhongquan Gold Deposit, Beishan Area,Gansu Province
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Shuhong DING
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表1 前红泉金矿蚀变绢云母Ar-Ar测年结果
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Table 1 Ar-Ar dating results of altered sericite in Qianhongquan gold deposit
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温阶/℃ | (40Ar/39Ar)m | (36Ar/39Ar)m | (37Ar/39Ar)m | 40Ar/% | F(40Ar*/39Ar) | 39Ar/(×10-14 mol) | 39ArCum./% | 年龄/Ma | ±1σ/Ma |
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800 | 23.9564 | 0.0087 | 0.0278 | 89.31 | 21.3960 | 2.11 | 3.83 | 228.7 | 1.2 | 900 | 24.0328 | 0.0017 | 0.0144 | 97.89 | 23.5263 | 8.40 | 15.24 | 249.9 | 1.2 | 1 000 | 23.6582 | 0.0005 | 0.0048 | 99.39 | 23.5136 | 18.75 | 34.05 | 249.8 | 1.2 | 1 100 | 23.6448 | 0.0002 | 0.0054 | 99.68 | 23.5703 | 13.53 | 24.56 | 250.4 | 1.2 | 1 200 | 23.7741 | 0.0002 | 0.0029 | 99.71 | 23.7063 | 12.01 | 21.80 | 251.7 | 1.2 | 1 300 | 26.6459 | 0.0113 | 0.0051 | 87.42 | 23.2940 | 0.29 | 0.52 | 247.6 | 3.8 |
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