栗木矿田沟挂垒富锂氟稀有金属花岗岩大规模气-液分离的岩石学证据及演化特征

Petrological evidences and evolutional characteristics for large-scale gas-liquid fractionation in Gougualei Li-F-rich rare metal granite,Limu ore-field,Guangxi

深部钻探取得的实际材料表明,栗木矿田沟挂垒隐伏花岗岩自上而下具有明显的分带性,通过细致的岩石学研究,得出花岗岩的分带性与岩浆侵位时发生的大规模气-液分离及随后的演化有关的结论。岩浆演化先后经历了岩浆富水结晶阶段、第一次气-液分离阶段、熔体快速结晶阶段、第二次气-液分离及大规模交代阶段,形成了一系列相关的岩石和分带。

Deep bore hole survey of Gougualei Granite shows that the granite has a vertical zonation.The intensive petrological study has yielded the following result.The zonation of granite is caused by magmatic liquid-gas fractiona-tion and later evolution.The processes of magmatic evolution include four stages.In the first stage,initial liquid with water-saturated crystallizes.In the second stage,first liquid-gas fractionation takes place.In the three stage,liquid crystallizes quickly.In the final stage,second liquid-gas fractionation and large-scale alteration take place.A variety of rocks are derived from the set of evolutional processes of magma.