【摘要】 位于粤东晚古生代坳陷区中段的玉水铜矿床,具有小范围成巨富矿的特点。对矿石元素地球化学特征和元素相关性进行分析,为玉水铜矿床成因提供佐证。研究结果显示,矿石中铜含量最高可达59.22%,并伴生有大量的Ag(最大含量达10 000μg/g),Ag仅与Cu呈正相关,而与其它元素不相关,表明Ag与Cu是同一来源;矿石的稀土总量变化极大,ΣREE为3.07～23 223.00μg/g,部分已经达到工业品位,且表现出重稀土元素富集而轻稀土元素亏损的配分模式;高稀土含量样品的ΣREE与Y、P、Sb、Bi、Be、As等元素具有明显的正相关关系,指示高含量稀土是来源于后期热液的叠加。结合Y/Ho-La/Ho变化趋势、Ce的弱负异常和Eu的负异常,认为玉水铜矿床应属于热液喷流沉积成因,但后期受到热液改造影响。更多还原

【Abstract】 The Yushui deposit, located in the middle part of the Late Paleozoic depression in eastern Guangdong province, is characterized by high-grade copper content in a small area. In this study, the geochemical characteristics of elements and their correlation in the ores are analyzed to provide evidence for the genesis of the Yushui copper deposit. The results show that copper content can reach a maximum of 59.22 % and is associated with a large amount of Ag(>10 000 μg/g in maximum). There is a positive correlation between Ag and Cu, indicating that Ag and Cu share the same origin. The total amounts of REEs in the ores vary from 3.07 to 23 223.00 μg/g, partially reaching industrial grade, and show a pattern being rich in heavy REE enrichment and deficient in light REE. The total REEs is positively correlated with Y, P, Sb, Bi, Be and As in those samples of high REE contents, which suggests that the high REE contents may be caused by hydrothermal superposition. Combining the variation trend of Y/Ho and La/Ho, the negative anomaly in Eu and weakly negative anomaly in Ce, it can be deduced that the Yushui copper deposit is the sedimentary exhalative deposits and affected by the transformation of later-stage hydrothermal alternation.更多还原