| 贾润幸,方维萱,隗雪燕.云南个旧锡矿花岗岩地球化学特征及构造环境研究[J].矿产勘查,2014,5(2):257-266 |
| 云南个旧锡矿花岗岩地球化学特征及构造环境研究 |
| Geochemical characteristics and tectonic setting of the granites in Gejiu Tin deposit,Yunnan Province |
| 投稿时间：2013-12-09 |
| DOI： |
| 中文关键词: 花岗岩 地球化学 构造环境 个旧锡矿 云南 |
| 英文关键词: granite geochemistry tectonic setting Gejiu tin deposit Yunnan |
| 基金项目:科技部转制院所技术开发研究专项资金项目(编号:2008EG115074、2009EG115074、2010EG115076)资助。 |
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| 中文摘要: |
| 文章通过对个旧锡矿西区贾沙二长花岗岩和东区老卡花岗岩地球化学特征的对比研究分析表明,前者Al2O3、TFe、K2O、Na2O的含量略高,后者SiO2、TiO2、CaO的含量略高；两者均具富集Cs、Rb、Th、U、Pb而亏损Ba、Sr等大离子亲石元素的特征,高场强元素分异明显；前者稀土总量、轻稀土含量和δEu值均高于后者,后者重稀土的含量明显高于前者。从个旧地区花岗岩的形成环境来看,该区花岗岩从西到东,从北到南具有从燕山期碰撞造山晚期逐渐过渡到碰撞造山期后的演化趋势,暗示岩浆期后气成成矿流体和盆地流体最终在个旧东区南部集中,成矿可能具有一定的方向性,该区可能为今后的重点找矿区域。 |
| 英文摘要: |
| The comparison study of geochemical characteristics between Jiasha monzogranite in the western part and Laoka granite in the eastern part in Gejiu tin deposit area, indicated that the contents of Al2O3, TFe, K2O and Na2O for Jiasha monzogranite is higher than those of Laoka granite while the contents of SiO2, TiO2 and CaO in Jiasha monzogranite is lower than those of Laoka granite,and both of them are enriched in Cs, Rb, Th, U, Pb and depleted in Ba, Sr. The LREE concentration and negative Eu anomaly with δEu for Jiasha monzogranite is higher than that of Laoka granite, and their HREE concentrations is lower than that of Laoka granite. In the view of the formation environment of different granites in Gejiu deposit area, it shows there is a distinct evolution trend of the granites from west to east and from north to south, i.e., the granites in western and northern parts formed in the late stage of Yanshanian collisional orogen and the granites in eastern and southern parts were formed in the post-collisional orogen, which implied that the postmagmatic ore-forming fluid and the basin fluid could be mainly concentrated in the southeastern part of the Gejiu deposit area which indicats that there is potential for prospecting tin deposit in the southeastern part of Gejiu area. |
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