东秦岭鱼池正长岩体岩石地球化学特征及稀有金属元素、稀土元素矿化

发布时间：2018-02-27 14:25

本文关键词： 东秦岭鱼池正长岩体稀有金属稀土元素成矿潜力　出处：《地质科技情报》2017年02期 　论文类型：期刊论文

【摘要】：河南方城鱼池正长岩体属于东秦岭北部富碱侵入岩,为本区出露规模最大的碱性岩体,迄今研究较为薄弱。通过对鱼池正长岩体的主量、稀土和微量元素岩石地球化学成分的系统分析和综合研究,探讨了该岩体岩浆源区特征、构造环境和该地区正长岩体稀有金属、稀土元素含矿性。鱼池正长岩体w(SiO2)为57.35%~61.38%,富碱,高Al,贫Ca、Mg和Ti,A/CNK为0.95~1.07,属于过铝质碱性岩。岩石稀土元素总量较高,(La/Yb)N比值为25.86~35.48,强烈富集轻稀土元素,轻、重稀土元素分馏明显,δEu值为0.48~0.63,具中等负Eu异常。富集大离子亲石元素、相对亏损高场强元素。由此表明:鱼池正长岩体的岩浆物质主要来源于地幔,后经过大量的壳源物质的混染,且岩体形成于板内拉张环境。另外该地区正长岩体w(ZrO2)为0.039%~0.174%,LREEO质量分数为0.026%~0.15%,显示了良好的Zr和LREE等稀有金属元素、稀土元素的矿化信息,具有巨大的成矿潜力。
[Abstract]:The Yuchi syenite in Fangcheng, Henan Province, belongs to the alkali-rich intrusive rock in the northern part of the East Qinling Mountains, and is the largest alkaline rock mass exposed in this area. Based on systematic analysis and comprehensive study of geochemical composition of rare earth and trace elements rocks, the characteristics of magma source, tectonic environment and ore-bearing properties of the syenite in this area are discussed. The value of wangsio _ 2 of Yuchi syenite is 57.35% 61.38, rich in alkali, rich in alkali-rich elements, rich in alkali-rich elements, rich in alkali-rich elements, and rich in alkali-rich elements. The contents of rare earth elements in the rocks are high, the ratio of La _ (10) O _ (1) N is 25.86 ~ 35.48, the fractionation of light and heavy rare earth elements is obvious, the 未 EU value is 0.480.63, and the 未 EU value is 0.480.63, which is a medium negative EU anomaly, and is enriched in large ion lithophile elements. The relative depletion of high field strength elements shows that the magmatic material of the Yuchi syenite is mainly derived from the mantle and is later mixed with a large amount of crust-derived materials. The rock body was formed in the intraplate extensional environment. In addition, the value of the syenite in this area is 0.039 and 0.174% LREEO mass fraction is 0.026 and 0.15, showing good mineralization information of rare metal elements, such as Zr and LREE, and has great metallogenic potential.
【作者单位】：河南理工大学资源环境学院;河南省有色金属地质勘查总院;
【基金】：国家自然科学基金项目(41003015) 河南省博士后基金项目“河南鹤壁地区金刚石成矿潜力地质条件研究”
【分类号】：P588.122;P618.6;P618.7

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