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铂族元素和贱金属合金矿物选自西藏南部罗布莎蛇绿岩的豆荚状铬铁矿石中 ,包括Os Ir、Os Ir Ru、Pt Fe、Ir Ni Fe、Fe Ni Cr和Fe Co ,它们都具有成分上的广阔变动。此外还见到少量的金刚石、石墨、SiC和未定名的Cr C、Fe Si等合金 ;自然Fe、Ni、Cr、Cu和Si。这些合金和自然元素矿物是选自于铬铁矿的人工重砂样品中 ,但是有些矿物呈包裹体或呈连晶与铬尖晶石共生。它们大多为半自形和它形的颗粒状矿物 ,偶有完好晶体保存 ,矿物粒径 0 .0 5～ 0 .5mm。有些矿物颗粒呈浑圆形 ,认为是液态乳滴。富Ru的铂族元素合金 ,Fe Ni、Fe Co合金 ,以及自然铁和自然镍 ,可以被解释成由铂族硫化物蚀变物。但是Pt Fe、Os Ir、Ir Ni Fe、FeSi合金、自然Si、FeO(方铁矿 )等 ,认为是来自地幔的外来 (捕虏 )晶体 ,是被地幔柱搬运到浅部的 ,最后被铬铁矿浆捕获并成为其包体。
The platinum group elements and the base metal alloy minerals are selected from podded chromite ores of the Luobusa ophiolite in southern Tibet including Os Ir, Os Ir Ru, Pt Fe, Ir Ni Fe, Fe Ni Cr and Fe Co, all of which With the vast changes in composition. In addition to see a small amount of diamond, graphite, SiC and unnamed Cr C, Fe Si and other alloys; natural Fe, Ni, Cr, Cu and Si. These alloys and natural elemental minerals are selected from artificial heavy sand samples of chromite, but some of the minerals are present as inclusions or are intergrown with chromium spinels. Most of them are semi-self-shaped and its shape of granular minerals, sometimes well preserved crystal, mineral particle size 0. 0 5 ~ 0 .5mm. Some mineral particles are rounded, that is, liquid droplets. Ru-rich platinum group elemental alloys, FeNi, FeCo alloys, as well as natural iron and natural nickel, may be interpreted as consisting of platinum group sulfide alterations. However, Pt Fe, Os Ir, Ir Ni Fe, FeSi alloy, natural Si, FeO (wolframite) and the like are considered as exotic (captive) crystals from the mantle being transported to shallow by the mantle plume, Iron ore capture and become its inclusion.