金家庄超基性岩型金矿蚀变矿化过程中物质组分变化定量研究

QUANTITATIVE STUDIES ON MASS CHANGE DURING ALTERATION AND MINERALIZATION PROCESSES IN THE JINJIAZHUANG ULTRABASIC ROCK-TYPE GOLD DEPOSIT

金家庄金矿围岩蚀变主要为蛇纹石化 -滑石化、碳酸盐化、绿泥石化及硅化。根据不同蚀变程度透辉岩化学成分与微量元素组分得失定量计算 ,Si O2 ,Ca O,Al2 O3,Na2 O和 CO,Cr,Pb等在各类蚀变透辉岩中明显亏损 ,在矿化蚀变岩和含金石英细脉中显著富集 ;CO2 ,H2 O,S和 Au,Cu在各类蚀变 -矿化岩石中均显富集 ;Ti O2 ,Mg O,V,Sr及 Pr表现为相对“惰性”。Si O2 ,Ca O,Al2 O3等物质组分得失变化主要反映了蚀变矿化过程中元素在超基性岩内的再分配。围岩蚀变主要为超基性岩遭受富含 CO2 热水作用而发生的系列水 -岩反应产物。

Wall rock alteration associated with the Jinjiazhuang gold ore deposit is dominanted by, serpentinization talcization, carbonatization, chloritization and silicification. On the basis of the calculation of the gains and losses of major and minor elements in various altered diopsidites, SiO 2,Ca,Al 2O 3,Na 2O,CO,Cr and Pb are obviously depleted in various types of altered diopsidites, and are remarkably concentrated in mineralized altered rock and auriferous quartz veinlets; CO 2,H 2O S,Au and Cu are concentrated in the all altered and mineralized rocks mentioned above; Ti 2O,MgO,V,Sr and Pr show inertia compared to the others. The gains and losses of SiO 2,CaO,Al 2O 3 reflect that the components may have been redistributed within source rocks ultrabasic rocks during the wall rock alteration, with CO 2 rich fluids of meteoric origin reacted with the source rocks ultrabasic rocks.