Chemical weathering history of the southern Tajikistan loess and paleoclimate implications
Chemical weathering history of the southern Tajikistan loess and paleoclimate implications
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DOI：
10.1360/03yd0344
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发表时间：
2003-10
影响因子：
5.7
通讯作者：
F. Ding;Z. Ding
中科院分区：
文献类型：
--
作者：
F. Ding;Z. Ding
测定了塔吉克斯坦南部恰希曼尼加尔黄土层序黄土样品的主要化学元素含量和Rb、Sr、Ba丰度。计算了试样的元素损失程度和风化强度。通过计算发现，恰希曼尼加尔剖面古土壤层受到一定程度的化学风化作用，土壤的风化强度比黄土层强，表明塔吉克斯坦南部古土壤沉积在相对温暖湿润的间冰期。此外，在0.9Ma BP之前沉积的塔吉克斯坦南部黄土比在0.9Ma BP之后沉积的黄土风化更强烈，这可能意味着该地区自0.9Ma BP以来干旱加剧。
Major chemical elements and Rb, Sr, Ba abundances were measured for loess samples from Chashmanigar loess-soil sequence in southern Tajikistan. And the degree of element loss and intensity of weathering of the samples were calculated. From these calculations we found that the paleosol horizons of the Chashmanigar section were chemically weathered to some extent and the weathering intensity of the soils is stronger than that of loess horizons, indicating that paleosols in southern Tajikistan were deposited in relatively warm and humid interglacial ages. In addition, the southern Tajikistan loess deposited before 0.9Ma BP was more intensely weathered than that deposited after 0.9Ma BP, which may imply the intensification of aridity in this area since 0.9Ma BP.