和龙百里坪银、多金属矿化集中区白垩纪岩浆岩地球化学特征与成矿

百里坪银、多金属矿化集中区白垩纪岩浆岩主要有花岗质与闪长质两个岩石系列。前者为富钾质钙碱性岩石,后者为富钠质碱钙性岩石,二者具有不同的变异曲线特征;花岗质岩石Co/N i值平均为2.644,闪长质岩石平均为0.498;花岗质岩石R b/S r值平均为0.223,闪长质岩石平均为0.020;在R b、S r、B a演化趋势上,花岗质岩石趋向富集R b,闪长质岩石趋向富集S r、B a,二者明显不同;两个岩系代表性岩石在稀土含量、稀土比值以及稀土模式上都不相同。两者的成矿专属性为:花岗质岩石对A g、Cu、P b、Zn矿化有利,闪长质岩石对A g、A u矿化有利。

Geochemical characteristics and mineralization of the Cretaceous period magmatic rock of the Bailiping silver-polymetaltic ore-concentrated province, Helong area

The Cretaceous period rocks can be divided into granitic rock series and dioritic rock series in the Bailiping silver-polymetaltic ore-concentrated province.The granitic rock contains rich potassic calc-alkaline,and the dioritic rock contains rich sodium alkali-lime,their variation curve characteristics are different;the two rock series have different ratio of Co/Ni,Rb/Sr,The granitic rock is rich in Rb and the dioritic rock is rich Sr,Ba.The two rock series are different in REE content,REE ratio and REE pattern.The mineralization forming specialization of the two rock series is that it is rich in the ore of Ag,Cu,Pb,Zn in granitics rock series and rich in the ore of Ag,Au in dioritics rock series.