中山大学学报自然科学版 ›› 2019, Vol. 58 ›› Issue (4): 30-41.doi: 10.13471/j.cnki.acta.snus.2019.04.003

• 论文 • 上一篇    下一篇

粤东玉水铜矿床地球化学特征及其对矿床成因的制约

黄毅1,5,胡希声2,王琰1,石贵勇3,5,郑兆勇1,薛飞1,孙晓明3,4,5   

  1. 1.国家海洋局南海规划与环境研究院,广东 广州 510300;
    2.国家海洋局南海环境监测中心,广东 广州 510300;
    3.中山大学海洋科学学院,广东 广州 510006;
    4.中山大学地球科学与工程学院,广东 广州 510275;
    5.广东省海洋资源与近岸工程重点实验室,广东 广州 510006
  • 收稿日期:2018-09-03 出版日期:2019-07-25 发布日期:2019-07-25
  • 通讯作者: 孙晓明(1963年生),男;研究方向:矿床学与矿床地球化学,海洋地质学;E-mail:eessxm@mail.sysu.edu.cn

Geochemical characteristics and genesis of the Yushui copper deposit, eastern Guangdong

HUANG Yi1,5, HU Xisheng2, WANG Yan1, SHI Guiyong3,5,, ZHENG Zhaoyong1, XUE Fei1, SUN Xiaoming3,4,5   

  1. 1. South China Sea Institute of Planning and Environmental Research, SOA, Guangzhou 510300, China;
    2. South China Sea Environmental Monitoring Center, SOA, Guangzhou 510300, China; 
    3. School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China; 
    4. School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China;
    5. Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China
  • Received:2018-09-03 Online:2019-07-25 Published:2019-07-25

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10 000 μg/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3.07~23 223.00 μg/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。

关键词: 元素地球化学, 元素相关性, 玉水铜矿床, 粤东

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.

Key words: element geochemistry, elemental correlation, the Yushui copper deposit, eastern Guangdong

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