黄土高原东缘晚全新世高精度高分辨率石笋古环境记录

董进国, 沈川洲, 姜修洋

An Absolute-dated High-resolution Palaeoclimate Record Between 4 400 and 150 a B.P. from Dragon Cave, Eastern Loess Plateau, China

Jin-guo DONG, Chuan-zhou SHEN, Xiu-yang JIANG

表1 龙洞石笋L1的MC-ICP-MS 测年结果

Table 1 Uranium and Thorium isotopic compositions and 230Th ages for L1 stalagmite from Dragon Cave by MC-ICP-MS

样品号 232Th 238U 230Th/232Th δ234U 230Th/238U 未校正年龄 校正年龄 δ234Uinitial (×10-12) (×10-9) (×10-12)d 测量值a 活度比c (a B.P.) (a B.P.)c,e 校正初始值b L1-3 191±8 393.4±0.7 196±9 1478±6 0.0058±0.0001 192±3 187±4 1479±6 L1-48 4288±17 452.6±0.8 68±1 1419±5 0.0391±0.0005 1715±24 1612±57 1426±5 L1-120 262±9 415.3±0.8 1530±55 1600±5 0.0584±0.0002 2415±11 2408±11 1611±5 L1-169 356±8 430.6±0.9 1368±31 1584±6 0.0685±0.0003 2865±13 2856 ±14 1597±6 L1-191 883±7 400.2±0.9 711±7 1572±9 0.0949±0.0005 4029±26 4006±28 1590±9