邹平火山岩盆地铜多金属成矿对构造岩浆事件的响应

The Response of Copper Polymetallic Deposit to Tectonicmagmatic Event of Zouping Volcanic Basin in Shandong Province

摘要:

通过邹平火山岩盆地不同岩石类型岩石化学特征的对比分析：认为火山活动总的趋势是由弱到强，爆发指数为38—68—92；火山岩3个亚组SI值均<40，表明母岩浆可能是由幔源岩浆经分异演化或同化而形成的；侵入岩σ介于2.39~4.99，属钙碱性碱性岩系；DI为65.15~88.98，岩浆分异演化程度相对较高；A/NKC为0.96~1.02，岩石为弱过铝质。该区岩浆岩属壳幔型中性岩—壳幔型和铝质地壳过渡区中酸性岩—酸性岩的岩浆岩区。铜多金属对构造岩浆事件的响应可描述为：长期继承性活动的区域性构造和振荡性的岩浆侵入活动，致使富碱质岩浆热液与已结晶的二长质岩石在地球化学界面发生交代蚀变，并进行了物质交换。

Abstract:

Through comparing petrochemistry characteristics of Zouping volcanic basin, it is regarded that general trend of volcanic activity is from weak to strong, and explosive index is 386892. SI values of volcanic rocks in three sub-formation are less than 40, which indicate that mother magama originated from the mantle might experience a process of magmatic differentiation or magmatic assimilation. σ values of intrusive rocks are from 2.39 to 4.99，which belong to calcalkaline series. DI values are 65.15~88.98. It indicates that magmatic differentiation is high. A/NKC values are 65.15~88.98. It demonstrates inferior aluminous. Response of copper polymetallic deposit and tectonicmagmatic event can be described that inherited tectonic movement and multiple magma intrusion make alkaline magmatichydrothermal and crystallized monzonite occur metasomatism and alteration, and make oreforming material interchanges near their geochemical interface.