中文摘要：

燕山晚期花岗岩小岩体的岩性为细粒二云母花岗岩,出露于诸广岩体中南部塘湾矿床北部约4km的范围内。针对细粒二云母花岗岩进行了6块样品的主量元素、微量元素和稀土元素的分析。结果表明：该岩体表现为高钾钙碱性,SiO2质量分数高（75.27%~76.55%,平均值为75.86%）;富碱（Na_2O＋K_2O=7.48%~7.66%,平均值为7.55%）,且钾大于钠;铝过饱和（A/CNK值介于1.11~1.22之间,平均1.16）的特点。微量元素中,富集Rb,Th,U,明显亏损Ba,Zr和Hf。稀土总含量不高,配分模式呈海鸥型,轻稀土分馏较明显,重稀土分馏较弱,以及强烈的铕负异常（δEu=0.15~0.20）等特征。推测其形成于岩石圈伸展减薄的环境下,源区主要由泥质岩组成。细粒二云母花岗岩与塘湾岩体的内外接触带与近SN向、NNE向构造复合部位为成矿的有利部位。

英文摘要：

Fine-grained two-mica granite occurs in south of Zhuguangshan rock body,about 4 km north of Tangwan ore deposit. Study of main elements, trace elements and rare earth elements of the rock mass show that the rock performance for high-k calc alkaline and SiOe content is 75.27%-76.55% ,with the average value of 75.86%. The rock is rich in alkali （NazO-I-K2O=7.48%- 7. 66% ,average 7. 55%）,with the potassium higher than sodium. A/CNK values range from 1.11 to 1.22,with an average of 1.16. The fine-grained two-mica granite is enriched in Rb, Th, U, and poor in Ba,Zr and Hf. Total content of rare earth is not high with sea-gull-shape type distribution pattern. Fractionation of light rare earth elements is obvious,while the fractionation of heavy rare earth is weak,with strong EU negative anomaly （δEu=0. 15-0.20）. It is considered that the sources of the rock mass mainly come from shale rock, and is resulted from the lithosphere exten- sion and thinning. The favorable position for mineralization is the inner and outer contact zone of the fine-grained two-mica granite with Tangwan pluton,also at the composite position with SN and NNE trending structures.