In the double-deck eolian sand hillock located in the Northern Tibet, the trace element contents in the two layers have not obvious discrepancy except Hg element,which indicates the two layers probably come from the same source.

• 藏北双层风成沙丘中两层沙子各粒级中元素含量没有明显差异(Hg除外); 推测两次堆积的风成沙来源地是一致的。