粤北下庄岩体岩石化学特征与铀成矿关系探讨  

Discussion on the Petrochemistry Characteristics and Uranium Deposit of Xiazhuang Pluton in Northern Guangdong Province

作　　者：吴继光 

机构地区：[1]广东省核工业地质局293大队,广东广州510800

出　　处：《东华理工大学学报（自然科学版）》2011年第3期209-214,共6页Journal of East China University of Technology(Natural Science)

基　　金：中央地勘基金项目(2009441002)

摘　　要：粤北印支期下庄岩体岩石具有富硅(SiO2=69.13%～73.39%,平均值71.73%)、富碱质(K2O+Na2O=7.49%～8.69%,平均值7.97%)等特征,w(K2O)/w(Na2O)>1,铝饱和指数(ASI)为1.01-1.21,岩体属于高钾钙碱性及过铝质岩石系列,以上特征表明,岩体属于典型的S型花岗岩,部分带有A型花岗岩的特征,是在地壳伸展-减薄的构造背景下,由变质泥岩与变质砂岩部分熔融共同作用的产物,经构造环境判别分析,岩体属于后造山花岗岩类的范畴,岩体的原岩为铀矿化提供了丰富的铀源,岩体形成时所处的构造环境为铀成矿提供了运移通道与赋存空间。The element characteristic of Indo-Chinese epoch Xiazhuang granite is rich in silicon（ SiO2 = 69.13% 73.39 % ）, alkalis （ K2 O ＋ Na2O= 7.49% - 8.69% ）, the ASI = 1.01 - 1.21 and ratio of w （ K2 O）/w （ Na2O） 〉 1, Xiazhuang pluton is belong to high potassium calcium-alkaline and aluminous series rocks. It shows that the pluton is typical S-type granite,little part is A-type granite character. Under the extension tectonic setting of lithosphere, the Xiazhuang pluton is partial melting product that making up metamorphic mud and sandstone together. By analysing the tectonic setting, the pluton is belong to post-collision granite that original rock provide abundant of uranium content for granite and the tectonic setting of forming provide the moving channels and occurrence space for uranium deposit.

关 键 词：下庄岩体 岩体成因 构造环境 铀矿化 成矿条件 

分 类 号：P584[天文地球—岩石学] P619.14[天文地球—地质学]