Test of magnetic susceptibility and grain-size age models of loess

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外文摘要：Ages of the stratigraphic boundary MIS1/2 and MIS3/4 of the Yuanbu loess section in Linxia are used as the basis of the nodal control age. The age of MIS1/2 and MIS3/4 are obtained from the latest international research result—the climatic events recorded in the stalagmite in the Hulu Cave in Nanjing, that MIS1/2 is 11.5 kaB.P. and MIS3/4 is 59.8 kaB.P. . The ages of the twoclimatic events contain three nodal age control models (Model 1:0 kaB. P. —59.8 kaB. P. ; Model2:0 kaB. P.—11.5 kaB. P. and 11.5 kaB.P.—59.8 kaB.P. ; Model 3: 11.5 kaB. P.—59. 8 kaB. P. ), which are used as the nodal control age separately. The deposition times of various stratigraphic horizons are calculated by using the magnetic susceptibility age model and grain-size age model, and thencompared with each other. In addition, the AMS~(14)C age, OSL age and the ages of YD and H events are compared with the ages of the corresponding horizons calculated by the three models of nodal control ages. From the analyses of lithologic characters and climatic stages it has been found that both the magnetic susceptibility age model and the grain-size age model have some defects. Because the accurate con-trol ages are selected as the nodal points of the glacial period or interglacial period, the stratigraphic deposition times determined by the high resolution of magnetic susceptibility age model and grain-size age model approximate to the actual ages. As for the relative accuracy of the two age models, the magnetic susceptibility age model is more accurate than the grain-size age model.

外文关键词：

loessnodal control agemagnetic susceptibility age modelgrain-size age modeltest

作者：

Chen Yimeng、Feng Zhaodong、Gong Huili

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作者单位：

MOE and Key Laboratory of Resources Environment and GIS of Beijing, Beijing 100037, China

出版年：

2007

Progress in Natural Science: Communication of State Key Laboratories of China

ISSN：1002-0071

年,卷(期)：2007.17(11)