岩浆对热泉型金矿化作用的热影响  

THE THERMAL EFFECT OF MAGMA INTRUSION IN HOT SPRING-TYPE GOLD MINERALIZATION

作　　者：张健[1] 石耀霖[1] 

机构地区：[1]中国科技大学研究生院地学部,北京100039

出　　处：《地球物理学进展》1999年第2期94-102,共9页Progress in Geophysics

摘　　要：岩浆的余热为热泉型金矿化作用浅成热液循环系统提供热源，促使热液迁移循环并改变热液性质和状态，使近岩浆热液达到超临界的高温，为热泉型金矿化作用提供热力学条件．本文根据腾冲一梁河地热系统的特点及岩浆活动的一般特征，模拟计算了岩浆余热在热泉型金矿化作用中的演化过程．在计算中，既考虑了岩浆凝固过程中释放的潜热，又考虑了岩石比热、热导率随温度的变化，同时考虑了大气降水对热液循环的补给．计算结果表明岩浆余热可使距其１ｋｍ的范围内有利于金矿化作用的温度结构维持近０．２Ｍａ．Residual heaf of magma is Critical to the hydrothermal circulation system in the hotSpring--type gold mineralization. According to the parameters of Tengchong-Liangheisothermal field and the physical properlies of rock, we have calculated basaltic magmaand granite magma models with high background heat now. In two--dimensional thermalmodeling, we use a method of equivalent heat capacity to handle the latent heat effect. Theatmosphere precipitation is taken for main source in hydrothermal circulation system inour Study. It is suggested that thermal effect in favour or the hot spring--type goldgeneralization can last 0.2 million years in time depart 1 kilometers from magma intrusion.

关 键 词：热泉型金 矿化作用 岩浆 热影响 金矿床 

分 类 号：P618.510.5[天文地球—矿床学]