冀西麻棚花岗岩类侵入岩体岩石地球化学特征  

Petrogeochemical characteristics of the intrusive bodies of Mapeng granitoids in western Hebei

作　　者：息朝庄[1] 戴塔根[1] 刘伟[1] 张惠军[1] 

机构地区：[1]中南大学地学与环境工程学院,湖南长沙410083

出　　处：《岩石矿物学杂志》2008年第2期113-120,共8页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(2004BA615-02)

摘　　要：以冀西石湖金矿麻棚岩体为研究对象，分别对斑状花岗岩、花岗闪长岩及石英闪长岩的岩石化学成分、微量元素及稀土元素进行了系统测定。岩体的SiO2平均含量为67．77％，略低于同处一个构造岩浆岩带的NE端紫荆关王安镇石英正长岩体（68．78％）。麻棚岩体稀土元素总量较高，介于136．41×10^-6～167．45×10^-6之间，稀土元素配分曲线为右倾斜型。LREE／HREE比值介于12．50～18．75之间，平均16．07，属轻稀土元素富集、重稀土元素亏损型。综合麻棚岩体岩石学、微量元素及稀土元素特征研究认为，麻棚岩体的成因类型为Ⅰ型花岗岩。Based on a study of Mapeng rock mass in the Shihu gold deposit, this paper made a systematic determination on the petrochemical composition, trace elements and rare earth elements of the porphyritic granite, granodiorite and quartz diorite respectively. The SiO2 of rock mass averages 67.77 %, slightly lower than that of Wang＇ anzhen quartz syerite of Zijingguan in the northeast, which belongs to the same structural magmatic belt. The total REE of Mapeng rock mass are relatively high, which range from 136.41 × 10^-6 to 167.45 × 10^-6. The REE distribution pattern inclines toward the right. The LREE/HREE value ranges from 12.50 to 18.75, averaging 16.07. It is characterized by obvious enrichment of light REE and depletion of heavy REE. From characteristics of petrology, trace elements and rare earth elements of Mapeng rock mass, the authors have reached the conclusion that the Mapeng rock mass is Ⅰ-type granite.

关 键 词：微量元素 稀土元素 花岗岩 麻棚岩体 石湖金矿 

分 类 号：P588.121[天文地球—岩石学] P59[天文地球—地质学]