中文摘要：

最近在西藏罗布莎蛇绿岩豆荚状铬铁矿中，发现包括金刚石、柯石英和某些简单氧化物，诸如SiO2、MgO、Fe2O2、Cr2O2、A12O2以及（Si，Ti）02等组成的矿物群。这些矿物是非常复杂的由70~80种矿物组成的地幔矿物群的一部分。这充分证实在地幔中存在简单氧化物。高压一高温相平衡实验表明，硅酸盐矿物在下地幔条件才可分解成FeO、MgO和SiO2等简单氧化物（＞670km）。因此有理由认为罗布莎简单氧化物可能来自下地幔深部。

英文摘要：

An assemblage of minerals including diamond, coesite and some simple oxides such as SiO2 .MgO, FeO, Fe203, Fe304, Cr203, A1203, TiO2, and （Si, Ti）O2 from podiform chromitites in Luobusa ophiolite was recently discovered. These minerals are a part Of very complicated mantle mineral group consisting of obout 70480 subtypes. It was fully proved that these simple oxides were formed in mantle. High-pressure and high temperature phase equilibrium experiments show that silicates will be decomposed into simple oxides like FeO, MgO and SiO2 beneath the lower mantle （〉670 km）. It is thought that the simple oxides were possibly derived from lower mantle.