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云南哀牢山蛇绿岩由变质橄榄岩、堆晶杂岩、火山熔岩和硅质岩等四个单元组成 ,其主要矿物有橄榄石、斜方辉石、单斜辉石、尖晶石、斜长石、角闪石、石榴子石等 ,这些矿物均已不同程度地遭到蚀变 ,橄榄石、斜方辉石的化学成分显示蛇绿岩中的二辉橄榄岩为原始地幔岩 ;尖晶石的化学特征表明蛇绿岩中的橄榄岩为深海橄榄岩 ;单斜辉石的成分反映二辉橄榄岩经历过部分熔融作用 ,堆晶杂岩和基性熔岩具有火山弧和洋底玄武岩的特征
The Ailaoshan ophiolite in Yunnan Province consists of four units: metamorphic peridotite, pluton, volcanic lava and chert. Its main minerals include olivine, orthopyroxene, clinopyroxene, spinel, Plagioclase, hornblende, garnet, etc. These minerals have been altered to varying degrees. The chemical composition of olivine and orthopyroxene shows that the lherzolite in the ophiolite is the original mantle rock. The chemical characteristics of the spinel indicate that the peridotites in the ophiolite are deep-sea peridotites; the composition of clinopyroxene reflects the partial melting of the lherzolites, and the hematite and basic lavas have volcanic arcs and ocean floor basalts Characteristics