东昆仑纳赤台北花岗闪长岩体地球化学特征及钨锡找矿潜力  

Geochemical Characteristics and W-Sn Deposit Prospecting Potential of the Granite Diorite in Northern Nachitai of East Kunlun Mountains

作　　者：邓红宾 魏华财 姚波 孙萍[1] 

机构地区：[1]四川省地质矿产勘查开发局川西北地质队

出　　处：《现代矿业》2017年第12期26-31,42,共7页Modern Mining

基　　金：青海省国土资源厅地质勘查基金项目(编号:青国土资矿[2011]435号)

摘　　要：结合岩石取样分析结果,分析了东昆仑纳赤台北花岗闪长岩体的地球化学特征。研究表明:该类岩体形成于早志留世,岩石地球化学特征显示岩体位于高钾钙碱性区,轻稀土相对富集于重稀土元素,Eu负异常特征明显,整体显示为S型花岗岩的特征。在此基础上,进一步讨论了岩体1∶50 000化探综合异常的元素特征关系,并与区域上新发现的钨锡矿的成矿地质条件进行了类比,认为岩体年龄值与区域已发现钨锡成矿的花岗岩体年龄值接近,具有典型钨锡矿床的成矿母岩特征,且1∶50 000化探综合异常中W、Sn、Bi、Au等丰度值较高。综合分析认为在纳赤台北花岗闪长岩体内寻找钨锡矿产的潜力较大。Based on the rock sampling analysis results, the geochemical characteristics of Northern Nachitai of East Kunlun Mountains is discussed. The study results show that the rock is formed in Lower Silurian, the geochemical characteristics of granite diorite show that the rock mass is distributed in high potassium calc alkaline zone, the light rare earth elements is more enriched to high rare earth elements, Eu negative anomaly characteristics is significant, the granite diorite is wholly characterized by S-type gran- ite. Based on the above analysis results, the relationship between 1 ： 50 000 geochemical comprehensive a- nomaly and element characteristics is discussed, the analogy analysis with the relationship and metallogen- ic geological condition of the newly found W-Sn deposit in the area is done. The study results show that the rock mass age is very close to granite age that is the W-Sn metallogenic parent rock, the granite diorite has the typical metallogenic parent rock characteristics of W-Sn deposit, besides that, the contents of W, Sn, Bi and Au of 1 ： 50 000 geochemical comprehensive anomaly are high. The comprehensive study results indicated that the prospecting potential of W-Sn deposit in the granite diorite in Northern Nachitai of East Kunlun Mountains is good.

关 键 词：东昆仑造山带 花岗闪长岩 锆石U-Pb定年 钨锡矿化 找矿潜力 

分 类 号：P588.12[天文地球—岩石学] P618.2[天文地球—地质学]