摘要
通过系统研究与成矿关系密切的莲花山花岗岩以及钨矿脉、云英岩和旁侧花岗岩的稀土元素地球化学特征,并进行对比分析,探讨粤北石人嶂钨矿床的成矿环境与成矿物质来源。研究表明,面型云英岩与脉侧云英岩以及相关的两类花岗岩的稀土元素组成存在明显差异,具有不同的物质来源,显示两期岩浆侵入与热液活动叠加特点;深部3种花岗岩及其脉侧云英岩的稀土配分模式很相似,表明具有相同的物质与热液来源;隐伏花岗岩体从浅部到深部,稀土总量、δEu值逐渐变小,显示岩浆岩结晶分异程度逐渐增强,为钨矿床形成提供了成矿物质来源;云英岩与花岗岩的稀土配分模式具有一定相似性,都是轻稀土富集,强烈铕亏损,而石英脉大多呈铕富集,相对富集轻稀土;随着成矿时间的推移,成矿环境由还原到相对氧化。因此,石人嶂钨矿床成矿热液与晚期岩浆热液具有相似性和继承性,成矿物质来源除了深部的白云母花岗岩,部分可能来自上部地壳。
By systematically comparing REE geochemical characteristics of granite in Mt. Lianhuashan,tungsten veins,greisen and side-granite which has close relationship with mineralization,the paper discussed the metallogenic environment and sources of Shirenzhang tungsten deposit in northern Guangdong. It has been shown that REE components of facial-type greisen,vein-side greisen and two types of related granite are obvious different. They have different material sources,which infer to two stages of magmatic intrusion and superimposed hydrothermal activity. The REE patterns of three types of granite in the deep tungsten vein and its veinside greisen are very similar,indicating the same substances and hydrothermal sources. ΣREE and δEu of the hidden granite body gradually increase from shallow to deep,showing that the degree of magmatic crystallization differentiation gradually decreased,providing mineral source for the formation of tungsten deposit. REE patterns of greisen and granite have certain similarities,LREE enrichment and a strong negative Eu anomaly. But most quartz veins have a positive Eu anomaly,enriched in LREE relatively. As mineralization time goes by,metallogenic environment changes from the reducing to the relative oxidizing. Therefore,there are similarities and inheritance between ore-forming hydrotherm of Shirenzhang tungsten deposits and late magmatic hydrotherm. Above all,these results suggested that the metallogenic material may be also partly from upper crust in addition to muscovite granite in the deep.
出处
《桂林理工大学学报》
CAS
北大核心
2014年第3期431-438,共8页
Journal of Guilin University of Technology
基金
国家深部探测计划专项(SinoProbe-03-01)
全国危机矿山接替资源勘查专项典型矿床研究项目(20109908-1)
广西地质工程中心重点实验室基金项目(11-031-20-1)
关键词
花岗岩
云英岩
钨矿脉
稀土地球化学
石人嶂钨矿床
granite
greisen
tungsten vein
REE geochemistry
Shirenzhang tungsten deposit
