湘南骑田岭花岗岩岩体地球化学特征及锡成矿潜力

骑田岭岩体为燕山期多阶段侵入的复式岩体。其主体芙蓉超单元的岩性主要为二长花岗岩、钾长花岗岩等,K2O+Na2O质量分数为7.32%～10.01%,平均值为8.17%;在花岗岩分类图解中,大多数样品都投影在A型花岗岩区内,但和典型的A型花岗岩相比,呈现出高TiO2、CaO、MgO,低FeO*/MgO等特点。花岗岩稀土元素配分模式相近,曲线表现为轻稀土段向右缓倾,而重稀土段则近于平坦,呈现典型的轻稀土富集、明显的负铕异常模式。花岗岩微量元素以Rb、Th强烈富集,Sr、Ti强烈亏损为特点,同时Ba、Ta、Nb、Nd、Zr、Hf也表现出一定程度的富集。骑田岭花岗岩具有较高的Sn背景含量,处于一个对Sn成矿非常有利的空间环境、时间背景之中,显示出良好的Sn成矿潜力。

Geochemistry and Tin Metallogenic Potential for Qitianling Granite Mass in Southern Hunan

Furong super-unit is a part of Qitianling granite mass which is Yanshanian complex pluton,and is mainly composed of adamellite and moyite.K2O+Na2O in content ranges from 7.32% to 10.01%,the average is 8.17%.In the granitic classification diagram of K2O-Na2O,the most samples are plotted in the area of A-type granite,but they are characterized by high TiO2,CaO,MgO,and lower FeO*/MgO contrasted with the typical A-type granite.The REE distribution patterns of granite are similar to each other,and show typical L...