伟晶岩
wěi jīnɡ yán
- 名pegmatite
伟晶岩-
赋存于云南前寒武系中的宝石伟晶岩
Gem bearing pegmatite in pre cambrian series of Yunnan
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它是由不同类型的岩石通过热液交代蚀变而形成的，主要包括白云岩蚀变为滑石为主的矿石和硅铝质岩石（云母片岩和伟晶岩）蚀变为绿泥石为主的矿石。
The deposit consists the metasomatic alteration of various rocks , mainly dolostones altered into talc-dominant ore and silico-aluminous rocks ( mica schists and pegmatites ) into chlorite-dominant ore.
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通过查明矿床的容矿构造特征以及构造期次与成矿的关系，对寻找新的铌钽伟晶岩矿床具有重要的实践意义。
In order to find new pegmatite Nb-Ta ore-deposit , it is very important practical-significances to ascertain the host structure characteristics and the relations between the tectonic epochs and ore-forming .