若尔盖510-1铀矿床方解石、石英微量元素地球化学特征  

Geochemical Characteristics of Trace Elements of Calcite and Quartz of the No.510-1 uranium ore deposit in Zoige

作　　者：何忠庠 陈友良[1] 常丹[1] 胡旭刚 魏佳[1] 

机构地区：[1]成都理工大学地球科学学院,成都610059

出　　处：《黑龙江冶金》2015年第4期12-17,共6页

基　　金：国家自然科学基金"若尔盖地区碳硅泥岩型铀矿床垂直分带规律研究"(编号:41072064)

摘　　要：本文通过对若尔盖510-1铀矿床中与铀成矿作用密切相关的热液矿物——成矿期方解石、石英的微量元素地球化学特征进行研究,结果表明成矿期方解石和石英中含量较高的微量元素种类基本一致,相对富含V、Ni、Zn、Sr、Ba、U等元素,且其微量元素相对于原始地幔的配分曲线形态亦基本一致,说明形成方解石和石英的成矿流体来源相同。总体上两者的稀土配分模式都呈相对平坦型,尤其是方解石的稀土配分模式与球粒陨石十分相似,可能暗示形成方解石的成矿流体具有一定的幔源特征。相关性分析表明,方解石中U与Sc、Y、Mo、Sb、Hf、Re呈明显的正相关,石英中U与V、Co、Ni、Cu、Zn、Ba呈明显的正相关,U与Co、Ni、Hf等深源元素相关的事实反映了形成矿床的成矿流体应当来源于深部。而方解石、石英中与U相关性较好的微量元素种类差异很大,这可能是形成方解石和石英的同源流体在后期演化过程中其所萃取的元素种类不同所致。This paper makes an analysis of the geochemical characteristics of trace elements of hydro- thermal minerals, such as calcite and quartz on metallogenic epoch which are closely related with ura- nium mineralization in the Zoige. 510 - luranium deposit. Results show that the kinds of trace ele- ments that are higher concentration in calcite is basically consistent with that in quartz. They are rela- tively rich in V, Ni, Zn, Sr, Ba, U and other elements. Shape of trace elements distribution of them patterns compared with the primitive mantle are consistent, which indicates that the metallogenic fluid forming calcite and quartz are the same. Overall, both rare earth distribution patterns are belong to a relatively flat type, especially rare earth distribution patterns are very similar with that of chondritic, suggesting that the ore - forming fluid of formation of calcite has certain characteristics of mantle source. Correlation analysis manifests that there are obviously correlation between U and Sc ,Y, Mo, Sb,Hf,Re in calcite, and between U and V,Co,Ni,Cu,Zn,Ba in quartz. The correlation of U and deep -source elements such as Co , Ni, Hf reflects that the metallogenic fluid should derive from deep -source. The Kinds of trace elements that correlate well with U in calcite and quartz are very different , which may be caused by difference kinds of trace elements extracted by the metallogenic flu- id forming calcite and quartz in the later evolution process.

关 键 词：510—1铀矿床 方解石 石英 微量元素 若尔盖 

分 类 号：P619.14[天文地球—矿床学]