论文部分内容阅读
通过对赫章铜矿化带的野外地质调查、采样、室内显微镜下分析、化学分析、扫描电镜、X衍射成分分析,研究了铜矿的矿物组成、矿石类型特征(初步划分为砂岩型铜矿石和蚀变构造角砾岩型铜矿石),矿石铜品位为3.26%～3.88%。采用ICP-MS方法测定了赫章铜矿两类型矿石、赋矿围岩及峨眉山玄武岩的稀土元素及微量元素组成,并进行了稀土特征值等的对比研究;LREE/HREE比值为9.43～11.12,La/Yb比值为11.86～14.6,显示出各样品轻稀土明显富集;δCe值为0.75～0.84,显示出负异常。除HTC-3的δEu=1.11、显示出很弱正异常外,其余样品的δEu=0.94～1.06,Eu仅显示非常微弱的异常。铜厂沟铜矿岩矿样品微量元素分布模式图表明其分布特征具有同源性。通过研究各样品的稀土元素、微量元素地球化学特征、铜矿化蚀变过程中稀土元素的迁移规律及呈现继承性的特点,结合飞仙关组砂岩的形成环境,得出峨眉山玄武岩为铜矿成矿(矿化)的物质来源结论。
Through the field geological survey, sampling, indoor microscope analysis, chemical analysis, scanning electron microscopy and X-ray diffraction analysis of the Hezhang copper mineralization belt, the mineral composition and ore type characteristics of the copper deposits were studied (initially classified as sandstone-type copper deposits Rock and alteration tectonic breccia type copper ore), the ore copper grade is 3.26% ~ 3.88%. The REE and trace element compositions of two types of ore, ore-hosting rock and basalt Emeishan in Hezhang Copper Mine were determined by ICP-MS method. The comparative study of rare earth eigenvalues was carried out. The LREE / HREE ratio was 9.43 ~ 11.12, The La / Yb ratio is 11.86-14.6, which shows that the light rare earths of each sample are obviously enriched. The δCe value is 0.75-0.84, showing a negative anomaly. Except for δEu = 1.11 of HTC-3, which shows a very weak positive anomaly, the remaining samples have δEu = 0.94-1.06. Eu shows only a very weak abnormality. The trace patterns of trace elements in the samples of Tongchanggou copper mine show that the distribution characteristics of these samples have homology. By studying the rare earth elements, trace element geochemical characteristics, rare earth elements migration and inheritance in the process of copper mineralization and alteration, combined with the formation of sandstone in Feixianguan Formation, it is concluded that the Emeishan basalts are copper Source of mineralization (mineralization) source conclusions.