依据12265个样品求出中国花岗岩类的总平均化学成分；
The total average chemical composition of granitoids in whole China is calculated with 12265 samples.
并且，黄土的平均化学成分十分接近现在使用的地壳克拉克值。
Moreover, the average chemical compositions of las were very close to Clark values of crust, which are used at Present.
因此，笔者认为，可以用黄土的平均化学成分来代表大陆上部地壳的平均化学组成。
Therefore, the average chemical compositions of loess may be used to represent average chemical constituents of continental upper crust.
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