老厂矿区花岗斑岩侵入以玄武岩为主体的火山岩围岩中,岩浆驱动热液对斑岩及围岩进行交代蚀变,是富硅富碱热液对贫硅玄武岩的交代过程。在首先确定主要岩石单元相对初始值的基础上,进而通过数据对比,获得热液蚀变过程中主要的元素变化特征,获得了如下的一些认识:花岗斑岩控制的热液体系,主体成分以富硅和锰为特征,斑岩从深部到浅部及火山岩围岩中,明显表现出硅和锰的富集,热液体系中的硅普遍被火山岩围岩所捕获,表现为Si O2在不同火山岩中都增 The granite porphyry in Laochang ore district invades volcanic rocks mainly composed of basalts, and the hydrothermal fluid driven by magma activates alteration alteration of porphyries and surrounding rocks. It is the replacement process of silicon-rich alkali-bearing hydrothermal fluids for poor silicon basalts. On the basis of determining the relative initial value of the main rock units and then comparing the data to get the main elemental variation characteristics during hydrothermal alteration, some understandings are obtained as follows: the hydrothermal system controlled by granite porphyry, the main component Rich in silicon and manganese, the porphyry clearly shows enrichment of silicon and manganese from deep to shallow and volcanic rocks. Silica in hydrothermal systems is generally trapped by volcanic rocks and shows Si O2 in the Different volcanic rocks are increased