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变超基性岩蛇纹石化橄榄岩的稀土元素配分具典型的U形特征，显示为具地幔交代作用的LREE富集地幔残余。
The REE distribution of serpentinized peridotite in ultrabasic rocks is the characteristic of U-type, showing that it was the LREE enriched residual mantle experienced in mantle metasomatism.
海相盆地中的基性岩石(如火山灰)经蚀变后形成蒙脱石。
Montmorillonite forms when basic rocks such as volcanic ash in Marine basins are altered.
湘西地区的岩金矿，主要有石英脉型、破碎带蚀变岩型和基性岩蚀变型三类。
The primary gold deposits in western Hunan are included mainly in three types as quartz vein type, fracture zone altered rock type and altered basic rock type.
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