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在雅鲁藏布江蛇绿岩带的东端罗布莎蛇绿岩的铬铁矿中发现不寻常的硅铁合金组合。 4种硅铁合金的理论分子式分别为Fe0 .84 Si2 .0 0 (Fe3 Si7)、Fe7Si3 、Fe6Si4 以及Fe4 Ti3 Si2 P。这些合金均选自铬铁矿石的人工重砂中 ,在少数颗粒中见到由 3种硅铁合金组成的交生结构 ,明显表明这些合金的同生和同成因性。推测它们为化学反应成因 ,来自于核幔边界地带。
Unusual ferrosilicon combinations were found in the chromite of the Robeska ophiolite at the eastern end of the Brahmaputra ophiolite belt. The theoretical formulas of the four ferrosilicon alloys are Fe0.84Si2.0O (Fe3Si7), Fe7Si3, Fe6Si4 and Fe4Ti3Si2P, respectively. All of these alloys were selected from artificial heavy sands of chromite, and the interlattice structure composed of three ferrosilicon alloys was seen in a few grains, clearly demonstrating the symbiosis and the same origin of these alloys. Presumably they are the cause of chemical reaction, from the nuclear mantle boundary zone.