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黄金科学技术 >

2022 , Vol. 30 >Issue 5: 676 - 690

DOI: https://doi.org/10.11872/j.issn.1005-2518.2022.05.188

矿产勘查与资源评价

湘东北万古金矿床不同期次黄铁矿微量元素特征及其对金成矿机制的启示

  • 万泰安 , 1, 2 ,
  • 许德如 , 1, 2, 3 ,
  • 马文 1, 2 ,
  • 张胜伟 1, 2 ,
  • 王国建 1, 2 ,
  • 卞玉冰 1, 2 ,
  • 李博 1, 2
展开
  • 1. 东华理工大学核资源与环境国家重点实验室，江西 南昌 330013
  • 2. 东华理工大学地球科学学院，江西 南昌 330013
  • 3. 东华理工大学江西省放射性地学大数据技术工程实验室，江西 南昌 330013
许德如（1966-），男，湖南岳阳人，教授，从事大地构造学与成矿学研究工作。

万泰安（1992-），男，江西泰和人，硕士研究生，从事金矿勘查研究工作。

收稿日期: 2021-11-30

  修回日期: 2022-01-20

  网络出版日期: 2022-12-10

基金资助

国家自然科学基金项目“江南造山带万古金矿床成矿流体活动的精细研究”(42002090)

“江南古陆金（多金属）大规模成矿的机理研究”(41930428)

收起

Trace Element Characteristics of Different Chronology Pyrite in Wangu Gold Deposit，Northeast Hunan and Its Implication to Gold Mineralization Mechanism

  • Tai’an WAN , 1, 2 ,
  • Deru XU , 1, 2, 3 ,
  • Wen MA 1, 2 ,
  • Shengwei ZHANG 1, 2 ,
  • Guojian WANG 1, 2 ,
  • Yubing BIAN 1, 2 ,
  • Bo LI 1, 2
Expand
  • 1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
  • 2. School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China
  • 3. Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology, East China University of Technology, Nanchang 330013, Jiangxi, China

Received date: 2021-11-30

  Revised date: 2022-01-20

  Online published: 2022-12-10

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本文亮点

万古金矿是江南造山带中金（多金属）成矿带的代表性矿床，目前对该矿床硫化物中的元素特征和金的富集机制研究相对较少。为了进一步探讨万古金矿中硫化物的微量元素特征，依据黄铁矿晶型及其他共生矿物特征，将其中的黄铁矿划分为3期（Py1、Py2和Py3），并对3期黄铁矿分别进行LA-ICP-MS分析。研究表明：Py1平行于地层层理，为不含金的原生黄铁矿；Py2与菱铁矿共生，是富CO2流体与围岩发生水岩反应所致，且对Py1具有继承性；Py3与烟灰色石英和毒砂共生，金含量较高。Py2表面孔隙发育，表明该期黄铁矿通过溶解—沉淀形成Py3。富金的Py3存在Au-As耦合现象，Au浓度明显低于金饱和曲线，推测Au以Au1+的形式赋于黄铁矿的晶格中。结合以往研究，推断硫化作用是万古金矿主要的金沉淀机制，富含Py2与菱铁矿的围岩是金沉淀理想的化学圈闭。

本文引用格式

万泰安 , 许德如 , 马文 , 张胜伟 , 王国建 , 卞玉冰 , 李博 . 湘东北万古金矿床不同期次黄铁矿微量元素特征及其对金成矿机制的启示[J]. 黄金科学技术, 2022 , 30(5) : 676 -690 . DOI: 10.11872/j.issn.1005-2518.2022.05.188

Highlights

The Wangu gold deposit is one of the most important parts of the gold （polymetallic） metallogenic belt in the Jiangnan orogenic belt，in which the mineral element composition characteristics of sulfide has relatively few research on the enrichment mechanism of Au.For further exploration of the element composition characteristics of sulfide in Wangu gold deposit，85 representative samples were selected and made into thin sections.The ore mineral pyrite and arsenipyrite in the deposit was taken as the research object，and the basic characteristics of mineral assemblage and mineral structure were observed under the microscope.According to the characteristics of pyrite crystal form and other symbiotic minerals，the pyrite in Wangu gold mine is divided into three stages：Py1，Py2 and Py3.Laser ablation plasma mass spectrometry （LA-ICP-MS） and mapping was used to analyze the trace element composition in these three stages.There are obvious differences in Au con-centrations in Py1，Py2 and Py3 of pyrite in Wangu gold deposit.Au elements mainly exists in Py3 in the metallogenic stage，while Au concentration in Py2 is low.At the same time，As elements in Py3 also appear in the position corresponding to the enrichment of Au elements.There is a coupling relationship between Au and As in pyrite of Wangu gold deposit.Therefore，speculation is made that Au mainly migrates in the form of Au-HS in the fluid and is mainly assigned to the lattice of pyrite in the form of Au1+.In this process，As is likely to replace S with As1- and form Fe（As，S）2 solid solution between pyrite and arsenopyrite，which is arsenic containing pyrite.Combined with the previous study，the result is that Py1 does not contain gold and is primary pyrite，and Py2 exists symbiotically with siderite.It is considered that siderite was formed before mineralization and was caused by water-rock reaction between Caledonian CO2 rich fluid and surrounding rock.Therefore，Py2 has a certain inheritance to Py1.As the main gold mineralizeation stage of Caledonian period，Py3 exists with smoky gray quartz and arsenipyrite，and has a high percentage of sulfide in gold.The growth of pores on the surface of Py2 is the typical dissolution reprecipitation feature，indicating that pyrite in this period was dissolved by later fluid and reprecipitation into Py3.In this process，the Yanshanian gold bearing fluid reacts with early Py2，which destroys the stability of Au-HS complex in the fluid and forms gold bearing Py3 through pyrite dissolution and reprecipitation.Combined with previous studies，it is considered that sulfidation is the main gold precipitation mechanism of Wangu gold deposit，and early Py2 and siderite can also provide ideal chemical traps for gold precipitation.

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世界黄金协会：全球金矿产量较去年三季度增加2%

世界黄金协会最新发布的《全球黄金需求趋势报告》显示，2022年三季度全球黄金需求同比增长28%至1 181 t，金矿产量（扣除净套保量）较去年三季度增加2%。

《报告》分析称，三季度的强势表现也将今年的黄金总需求拉回至疫情前水平。本季度黄金投资规模同比减少47%，投资需求收缩显著，黄金ETF大幅流出227 t，再加上疲软的场外需求与期货市场的负面情绪，金价表现因此受阻，导致2022年三季度金价环比下跌8%。而为应对高企的通胀和地缘政治风险，个人投资者对黄金的保值属性愈发关注。投资者购买金条和金币来对冲通胀，也将黄金零售投资总需求同比拉高36%。

《报告》称，从全球范围看，三季度金饰消费持续反弹，现已恢复至疫情前水平达523 t，较2021年三季度增长10%。从国内方面看，随着国内消费者对于金饰青睐度不断提升及三季度国内金价的相对稳定，部分压抑的消费需求得到释放，中国的金饰需求也出现了5%的同比小幅增长。从央行方面看，购金量也有明显增加。预计三季度购金量会逼近400 t的新纪录。世界黄金协会今年的央行调查报告显示，25%的受访央行表示会在未来12个月内增加黄金储备。从供应方面看，金矿产量（扣除净套保量）较去年三季度增加2%，采金业连续六个季度实现增长。相比之下，消费者在面对通胀加剧以及充满变数的经济前景时选择坚定持有黄金，因此三季度回收金总量同比下降6%。

世界黄金协会资深分析师Louise Street表示，今年的黄金需求走势反映出了黄金作为避险资产的重要地位，2022年的黄金表现优于大多数资产类别这一事实就是相关力证之一。未来，央行购金和零售黄金投资将继续保持强势，这有望抵消在美元可能维持强势的背景下，场外交易和黄金ETF投资的潜在降幅。而在印度、东南亚等国家和地区，金饰需求将持续走强。但受经济下行影响，科技用金总量可能会进一步减少。

脚注

中国矿业报）

http://www.goldsci.ac.cn/article/2022/1005-2518/1005-2518-2022-30-5-676.shtml

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