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风化作用揭露出的现代上大陆壳(10—15公里)的化学成分,可从沉积岩的取样、或从观察到的沉积岩稀土元素图谱的一致性获得。稀土元素图谱的使用原理是,稀土元素在沉积作用下不发生分异,仅在变质作用中偶然发生变化。现代上大陆壳成分大致接近花岗闪长岩。但是它不能代表整个地壳的成分,还要考虑到热流和地球化学元素平衡方面的缘由。整个地壳的一个可行的摸拟成分是,它在成分上是接近安山岩或钠质花岗
The chemical composition of the modern upper continental crust (10-15 km) revealed by weathering can be obtained from the sampling of sedimentary rocks or from the observed consistency of the REE trace of sedimentary rocks. The principle of the use of rare earth elements in the spectrum is that rare earth elements do not differentiate in the deposition, only occasionally change metamorphism. Modern continental crust composition roughly close to the granodiorite. However, it does not represent the composition of the entire crust, but also considers the reason for the balance of heat flux and geochemical elements. A viable simulating component of the entire crust is that it is compositionally close to andesite or sodium granite