广西金牙金矿床构造动力成矿高温高压实验及其研究意义

HIGH T,P EXPERIMENT DUE TO TECTONIC FORCE MINERALIZATION AT JINYIA GOLD DEPOSIT AND ITS RESEARCH SIGNIFICANCE

作者根据金牙金矿床地质,成矿物质和介质来源,成矿温、压和物理化学条件和矿体分布等特征研究认为,该矿床的形成与构造动力有关。据此,确定实验的温、压条件,并适当考虑岩石含水量的影响。实验结果表明:岩石、矿物变形随温、压和含水量增加而由脆性向韧性变化,溶(熔)点降低。溶解度升高;岩石中高能量、高应力部位发生破裂、变形,之后应力、能量释放而变为低应力、低能量部位。Fe,S,As,Au,Ag等元素活化,矿物、岩石挤压溶解(熔融)和析水,由高应力、高能量部位驱向低应力、低能量的裂缝运移、扩容充填、汇聚、结晶成矿。证实了该金矿床的成矿机制和成矿模式。

For Jinyia gold deposit.according to thd geology,sources of ore-forming composition and medium. T, q and other physicochemical conditions at the time of mineralization and the distribution characteristics of ore bodies in fault zones, the author decides the formation of the gold deposit related to tectonic force. So, to assure T, p values of the experiment and to consider the influence of water content in rock is the first step. The result of experiment indicated that when the T, P values and water content increase, deformation of rock and mineral changes from fragility to tenacity,at the same time,lowing the melting and dissolvde poit,increasing the dissolubility; The places with higher energy and stress bresk and deform to become places with the lower energy and stress when the stress and energy releaasing. The elements, such as Fe, S,As,Au.Ag etc, are activated and rocks and minerals are squeezde to dissolve,melt and leak out,migrate from the places with higher pressure and energy towards the fracture with lower pressure and energy,and accumulates there forming ore bodies. The experiment above has testified metallogenic mechanism and model of the gold deposit. It infers the symbols.model s and directions of prospecting ore deposits for further study.