南京地区下蜀土元素地球化学特征及物源判别

Elemental Geochemistry of the Nanjing Xiashu Loess and the Provenance Study

从南京地区燕子矶与泰山新村下蜀土的 18个微量元素中 ,选取在表生环境下较稳定的 15种元素 ,运用图解和物源判别指数方法分析下蜀土的物质来源 ,揭示了下蜀土与西北黄土在元素组成上的相似性 ,而与长江漫滩沉积物的元素组成明显不同 .结合下蜀土的宏观和微观特征可以推断下蜀土的物源与西北黄土沉积物一致 。

This article determined the contents of 18 trace elements in the Yanziji and Taishanxincun Xiashu Loess sediments.Those stable elements are used in the geochemical statistical methods such as F D, I p and scatterplots to study sediment sources of Xiashu Loess in Nanjing.The result shows that its sedimentary geochemical composition is very similar to Xi'an Loess in the Loess Plateau,but obviously different from the Changjiang flood plain sediment.Combined with the macro and micro characters of the Xiashu Loess,we deduced that the sediment source of the Xiashu Loess is similar to that of the Xi'an Loess,but dissimilar to the Changjiang flood plain sediment.