高分辨率石笋记录的三峡库区小冰期气候变化
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杨勋林, 陈发虎, 袁道先, 程海, 张月明, 黄帆
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Climate Change During Little Ice Age with High-resolution Stalagmite Record in the Three-Gorges Reservoir Area
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Xun-lin YANG, Fa-hu CHEN, Dao-xian YUAN, Hai CHENG, Yue-ming ZHANG, Fan HUANG
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表1 水鸣洞石笋NSM03 230Th测年结果 |
Table 1 230Th dating results of stalagmite NSM03 in Shuiming Cave |
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样品号 | 距离(mm) | 238U (×10-9g/g) | 232Th (×10-12g/g) | δ234U 测量值 | 230Th/238U活度比 | δ234U 初始值 | 230Th(a) 校正年龄 | NSM31 | 4 | 1036±3 | 51±4 | 0.017±0.0002 | 5574±393 | 5022±16 | 304±4 | NSM32 | 5 | 958±1 | 434±2.2 | 0.017±0.0001 | 634±4 | 5058.5±8.9 | 312±2 | NSM33 | 22 | 1072±4 | 132±2 | 0.025±0.0002 | 3339±54 | 5124±18 | 444±4 | NSM34 | 32 | 1398±5 | 524±3 | 0.028±0.0002 | 1219±10 | 5173±14 | 489±4 | NSM35 | 52 | 1087±4 | 735±3 | 0.031±0.0003 | 746±7 | 5040±19 | 551±5 | NSM36 | 71 | 1115±2 | 1213±3.8 | 0.033±0.0001 | 494±3 | 5010.3±10.3 | 589±4 | NSM37 | 84 | 954±3 | 1746±6 | 0.038±0.0003 | 342±3 | 5002±15 | 684±8 |
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