根据地震及地球物理等有关资料,现在人们认为:上地幔也是由岩石所组成,这种岩石称为地幔岩。它基本上是一种塑性固态物质,这些物质构成了上地幔的软流层,其总体成分接近于二辉橄榄岩,即相当于3—5份的橄榄岩加一份玄武岩。由于上地幔地质环境的非均一性,所以随着二辉橄榄岩产出部位之变化,它的化学成分及其性质也有相应的差异。 According to the earthquake and geophysical data, it is now thought that the upper mantle is also composed of rocks, called mantle rocks. It is basically a plastic, solid material that forms the upper mantle in the asthenosphere with an overall composition close to that of lherzolite, which corresponds to 3-5 parts of peridotite plus one basalt. Due to the heterogeneity of the geological environment in the upper mantle, the chemical composition and properties of the lherzolite vary with the location of the lherzolite.