最近500年来福建玉华洞石笋氧同位素记录及气候意义
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姜修洋, 李志忠, 李金全, 孔兴功, 郭允
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Stalagmite δ18O Record from Yuhua Cave over the Past 500 Years and Its Regional Climate Significance
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Xiu-yang JIANG, Zhi-zhong LI, Jin-quan LI, Xing-gong KONG, Yun GUO
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表1 YH1石笋230Th测年结果 |
Table 1 230Th dating results for stalagmite YH1 |
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样品号 (深度) | 238U | 232Th | 230Th / 232Th | δ234U | δ234UInitial | 230Th / 238U | 230Th年龄/yr B.P. | 230Th年龄/yr B.P. | ( ×10-9 g/g) | ( ×10-12 g/g) | (原子数×10-6) | (测量值) | (校正值) | (活度比) | (未校正值) | (校正值) | YH1-70 | 401.4±0.5 | 1242.7±7.5 | 13.0±0.7 | 172.9±1.8 | 173.0±1.8 | 0.0024±0.0001 | 226±12 | 156±37 | YH1-225 | 437.2±0.5 | 854±11 | 36.3±1.6 | 169.9±2.0 | 170.1±2.0 | 0.0043±0.0002 | 401±17 | 357±28 | YH1-320 | 480.1±0.6 | 268.0±7.8 | 126.8±5.2 | 167.7±1.9 | 167.9±1.9 | 0.0043±0.0001 | 402±12 | 389±13 | YH1-370 | 532.1±0.6 | 386.4±8.8 | 119.6±4.1 | 166.7±1.7 | 167.0±1.7 | 0.0053±0.0001 | 493±13 | 477±15 |
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