Coltice N, Albarede F, Gillet P
Laboratoire des Sciences de la Terre, Ecole Normale Superieure, 69364 Lyon cedex 7, France.
Science. 2000 May 5;288(5467):845-7. doi: 10.1126/science.288.5467.845.
Extraction of potassium into magmas and outgassing of argon during melting constrain the relative amounts of potassium in the crust with respect to those of argon in the atmosphere. No more than 30% of the modern mass of the continents was subducted back into the mantle during Earth's history. It is estimated that 50 to 70% of the subducted sediments are reincorporated into the deep continental crust. A consequence of the limited exchange between the continental crust and the upper mantle is that the chemistry of the upper mantle is driven by exchange of material with the deep mantle.
钾进入岩浆的过程以及熔融过程中氩的脱气作用，限制了地壳中钾的相对含量与大气中氩的相对含量。在地球历史上，俯冲回地幔的大陆现代质量不超过30%。据估计，50%至70%的俯冲沉积物会重新并入深部大陆地壳。大陆地壳与上地幔之间有限的物质交换导致的一个结果是，上地幔的化学组成受到与深部地幔物质交换的驱动。
