中文摘要：

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。

英文摘要：

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 LREE enrichment, an obvious negative Eu anomaly pattern. The LREE distribution curves are light right deviation and the part of HREE almost smooth. For the trace elements of granite, Rb and Th are enriched strongly, Sr and Ti appear as strong depletion, and Ba, Ta, Nb, Nd, Zr and Hf also show a character of enrichment in a certain degree. Qitianling granite with high tin background content is favorable to tin mineralization in space environment and time stage,showing a good potential to tin mineralization.