Discovery and significance of annually black carbon lamina in stalagmite from Chituxianren cave, Yunnan Province
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图 1
(a) 石笋CTXRD1205的扫描图像；(b，c)为图(a)中红色方框内同一层段透射光和荧光照射下的年纹层，红色箭头对应明亮亚层，黑色箭头对应暗色亚层；(d，e)为图(a)中黄色方框内透射光和荧光照射下的黑碳年纹层，红色箭头指示处为黑碳层
表 1
CTXRD1205 230Th定年结果与微层计数结果对比
Sample 238U 232Th 230Th/232Th δ234U* 230Th/238U 230Th Age (a) 230Th Age(a) δ234UInitial** 230Th Age***(a B.P.) 230Th Age(A.D.) 微层计数 Number (ppb) (ppt) (atomic×10-6) (measured) (activity) (uncorrected) (corrected) (corrected) (corrected) (corrected) 结果 CTXRD1205-5 1108±2 137±4 76.1±25.6 94.8±1.9 0.0006±0.0002 57±19 53±19 95±2 33±19 1967±19 36±1 CTXRD1205-18 441±1 101±3 146.4±23.9 50.6±2.0 0.0020±0.0003 211±34 205±34 51±2 183±34 1817±34 141±3 CTXRD1205-60 441±1 578±12 55.3±5.5 42.1±2.1 0.0044±0.0004 461±45 424±52 42±2 404±52 1596±52 409±9 *δ234U=([234U/238U]activity-1)×1000；**δ234Uinitial was calculated based on230Th age (T)，i.e.，δ234Uinitial=δ234Umeasured×eλ234T. Corrected 230Th ages assume the initial 230Th/232Th atomic ratio of (4.4±2.2)×10-6. Those are the values for a material at secular equilibrium，with the bulk earth 232Th/238 U value of 3.8. The errors are arbitrarily assumed to be 50 %；* * * B.P. stands for “Before Present” where the “Present” is defined as the year 2000 A.D. 
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