粤东北仁差盆地麻楼铀矿区次火山岩地球化学特征及成因

Geochemical Characteristics and Petrogenesis of Subvolcanic Rocks in Malou Uranium Mining Area of Rencha Basin, Northeastern Guangdong

仁差盆地麻楼铀矿区矿床主要赋存于EW向麻楼构造带中的次流纹斑岩中,为厘清赋矿岩石地球化学特征及成因,对该地区次火山岩进行全量分析测试。结果表明,该岩体岩性以次火山岩为主,矿物组成具长英质火山岩特征,本区次流纹斑岩元素组成具富碱、富钾、贫铁及硅、铝过饱和特征,属高钾钙碱性系列或钾玄岩系列火山岩,其主量元素、微量元素和稀土元素特征反映物质来源具壳源性质。

Deposit of Malou uranium mining area in Rencha basin mainly occur in supergene rhyolite porphyry,which is produced in Malou structural belt.In order to clarify the geochemical characteristics and petrogenesis of the ore bearing rocks,a total analysis of subvolcanic rocks is carried out in this paper.The results of systematic analytical test show that the rock mass is dominated by subvolcanic rocks and the mineral composition has the characteristics of felsic volcanic rocks.The subfluvial porphyry elements in this region are characterized by rich alkali,rich potassium,poor iron and silicon aluminum supersaturation,belonging to high potassium calcium alkaline series or potassium basaltic series.The characteristics of its main content elements,trace elements and rare earth elements reflect its material origin has shell source property.