【引用本文】 周姣花, 周晶, 牛睿, 等. 重砂分级-扫描电镜-能谱等技术研究湖南张家界黑色页岩贵金属元素赋存状态[J]. 岩矿测试, 2019, 38(6): 649-659. doi: 10.15898/j.cnki.11-2131/td.201905090057
ZHOU Jiao-hua , ZHOU Jing , NIU Rui , et al. A Study on Occurrence of Noble Mental Elements in Black Shale Series in Zhangjiajie, Hu'nan Province by Heavy Placer Classification-SEM-EDS and Other Techniques[J]. Rock and Mineral Analysis, 2019, 38(6): 649-659. doi: 10.15898/j.cnki.11-2131/td.201905090057

重砂分级-扫描电镜-能谱等技术研究湖南张家界黑色页岩贵金属元素赋存状态

1. 河南省岩石矿物测试中心, 河南 郑州 450012;

2. 中国地质大学(武汉), 湖北 武汉 430074

收稿日期: 2019-04-01  修回日期: 2019-07-26 

基金项目: 河南省岩矿测试中心科技创新基金项目(豫地测[2017]54号-201703);国家自然科学青年科学基金项目(41802042)

作者简介: 周姣花,高级工程师,主要从事岩矿鉴定、工艺矿物学研究工作。E-mail:1071732967@qq.com。。

A Study on Occurrence of Noble Mental Elements in Black Shale Series in Zhangjiajie, Hu'nan Province by Heavy Placer Classification-SEM-EDS and Other Techniques

1. Rock and Mineral Analysis Center of Henan Province, Zhengzhou 450012, China;

2. China University of Geoscience(Wuhan), Wuhan 430074, China

Received Date: 2019-04-01
Revised Date: 2019-07-26

摘要:黑色岩系是多种有用元素的重要载体,Cu、Pb、Zn、Ni、Mo、V、U、Au、Ag、稀有和稀土元素在黑色岩系中异常富集,某些黑色岩系的贵金属(铂族元素、Au、Ag)含量也异常富集,甚至部分超过了基性和超基性岩,这类黑色页岩矿床中铂族元素(PGEs)的赋存状态至今尚未有一个确切的定论。本文采集了湖南张家界属寒武系牛蹄塘组黑色页岩中Mo-Ni矿层作为研究样品,通过化学分析表明矿石中含Pt 531×10-9,Pd 514×10-9,Os 185×10-9,PGEs合量1259.43×10-9,Au 332×10-9,Ag 12.2×10-6,已富集成矿。进一步利用重砂分级、化学分析、X射线衍射、扫描电镜及能谱技术研究了贵金属元素赋存状态,结果表明:①Ag:主要以独立矿物形式存在,少量以类质同象形式赋存在其他矿物中。独立矿物有砷铜银矿、硫锑铜银矿、硫锑铅银矿、锑银矿、硫银锡矿、硫砷银铅矿、银黄锡矿、辉银矿、锑-银-锡互化物;类质同象主要是银黝铜矿-银砷黝铜矿、含银方铅矿和含银砷铜矿等。②Au:未发现独立矿物,黄铁矿是重要载金矿物。③PGEs:未见独立矿物,在不同重砂分级样品中没有富集,具分散性,推测铂族矿物很可能是以纳米形式存在,建议今后研究选矿工艺时,可考虑从制取纳米材料的思路进行应用研究。本文Ag-Sn-Sb互化物的发现为研究黑色岩系多元素富集成因机制提供了重要物证。

关键词: 黑色页岩, 贵金属元素, 赋存状态, Ag-Sn-Sb互化物, X射线衍射法, 扫描电镜能谱

A Study on Occurrence of Noble Mental Elements in Black Shale Series in Zhangjiajie, Hu'nan Province by Heavy Placer Classification-SEM-EDS and Other Techniques

KEY WORDS: black shale, noble metal elements, occurrence, Ag-Sn-Sb intergrowth compounds, X-ray diffraction, scanning electron microscope-energy spectrum

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重砂分级-扫描电镜-能谱等技术研究湖南张家界黑色页岩贵金属元素赋存状态

周姣花, 周晶, 牛睿, 徐畅