中国东部铀成矿带中酸性岩与全球A型花岗岩对比  

Comparison of U-mineralization-Related Intermediate-Acid Rocks in Eastern China with Globlal A-Type Granite

作　　者：郭佳磊[1] 巫建华[1,2] 郭恒飞 韦昌袭 

机构地区：[1]东华理工大学地球科学学院,南昌330013 [2]东华理工大学核资源与环境国家重点实验室培育基地,南昌330013

出　　处：《矿物岩石地球化学通报》2017年第6期897-904,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金项目(41372071);中国核工业集团公司项目(中核地计2008-74)

摘　　要：中国东部铀成矿带中酸性岩广泛发育,前人对中国东部和铀矿有关的中酸性岩进行了广泛的研究,取得了许多成果,推动了中酸性岩和铀矿找矿的进步。本文尝试应用大数据方法对比中国东部铀成矿带中酸性岩与全球A型花岗岩的地球化学特征,主要采用不同元素比值对来考察它们之间的区别,得出72个元素对,做出2556个图解,从中优选出12个图解,获得了比较好的效果。研究表明,中国东部铀成矿带中酸性岩与全球A型花岗岩具有大体一致的地球化学特征;在许多判别图中,中国东部铀成矿带中酸性岩位于全球A型花岗岩范围之内,且主要位于全球A型花岗岩的一侧,说明它们之间既有共性又有差异性。差异主要体现在中国东部铀成矿带中酸性岩更加亏损Co、Ni、Cu、Nb、Ta和富集P_2O_5、Sr、Sc、Pb的特征上。本文公布的判别图说明,落在中国东部铀成矿带中酸性岩范围之外的花岗岩是与铀矿无关的;落在中国东部铀成矿带中酸性岩范围内的可能与铀矿有关,也可能与铀矿无关;但是,与铀矿有关的花岗岩一定落在中国东部铀成矿带中酸性岩范围内。上述结论是初步的,需要在实践中进一步检验。The intermediate-acid rocks associated with uranium mineralization are widely developed in Eastern China. Many researchers have extensively studied and reached great results, which promotes the progress on origin of intermediate-acid rocks and uranium prospecting. This paper compare such intermediate-acid rocks with global A-type granite by big data. By using element pairs to inspect the differences between them, we have got 72 element pairs and 2556 diagrams. 12 diagrams of them show good discrimination. Results show that intermediate-acid rocks associated with u- ranium mineralization in Eastern China have geochemical features similar as global A-type granite. In many discrimination plots, the intermediate-acid rocks in Eastern China fall into the field of the global A-type granite. In addition, they mainly concentrate in one part of the area of global A-type granite, suggesting that these two have slight differences. Compared with global A-type granites, the intermediate-acid rocks associated with uranium mineralization in Eastern China are deple- ted in Co, Ni, Cu, Nb and enriched in P205, Sr, Sc, Pb. Although granite with compositions similar as intermediate-acid rocks associated with uranium mineralization in Eastern China might have not experience uranium mineralization, all gran- ites plot out of the range of intermediate-acid rocks are not uranium mineralized. Such conclusions are preliminary and need to be further evaluated in practice.

关 键 词：大数据 铀矿 中酸性岩 A型花岗岩 

分 类 号：P588.121[天文地球—岩石学] P619.14[天文地球—地质学]