内蒙大井矿床的绿泥石研究

绿泥石是热液型多金属矿床中广泛分布的近矿晕矿物，在大井矿床见于近矿的电气石绢云母－石英交代岩，石英－绿泥石－永绢云母交代炭和碳酸盐岩矿物交代岩中，绿泥石成分复杂，通过对大井矿床绿泥石成分测定，并与国内外同类型矿床中的绿泥石成分进行对比研究，发现绿泥石成分的含铁度（Ｆｅ／（Ｆｅ＋Ｍｇ＋Ｍｎ＋Ｃａ）可用来标志矿床的不同金属组合。大井矿床为Ａｇ，Ｃｕ，Ｓｎ，Ｐｂ，Ｚｎ组合，绿泥石为含铁度高的种属，俄罗斯

The Study of Chlorite at Dajing Deposit in Innrer Mongolia of China

Chlorite widely occurs in the alteration halo of hydrothermal deposits,it has been found in the alteration rocks of tourmaline sericite quartz,quartz chlorite hydrosericite and carbonate in Dajing Deposit.These rocks are adjacent to the ore body.The chemical composition of chlorite is complicated.After study the chlorite composition in Dajing Deposit as well as other deposits with same type worldwide,it is discovered that the ferriferous coefficient[Fe/(Fe+Mg+Mn+Ca)] of chlorite can be used as indicator for various metal assemblages in ore deposits.Chlorite in Dajing Deposits has an assemblage of Ag Cu pb Zn,which is high for ferriferous coefficient.While chlorite in Kwaisin and Cibai of Russia has the assemblage of Pb Zn(where Zn is dominated)which contains species with low ferriferous coefficient.There is a positive correlation between ferriterous coefficient of chlorite and its occurring elevation.This is resulted from the variation of the activity of Fe and Mg,the acidity and alkalinity of solution in different elevation and deposits.Besides that,parameter b 0 of unit in chlorite also shows positive correlation with its occurring elevation in Dajing Deposit and b 0 is larger in shallow than that in depth.This is contributed to the closest packed structure under the condition of high pressure.