Chemical and Mineralogical Mapping of Platinum-Group Element Ore Samples Using Laser-Induced Breakdown Spectroscopy and Micro-X-Ray Fluorescence,Geostandards and Geoanalytical Research

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Chemical and Mineralogical Mapping of Platinum-Group Element Ore Samples Using Laser-Induced Breakdown Spectroscopy and Micro-X-Ray Fluorescence
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2021-05-07 , DOI: 10.1111/ggr.12385
Nessrine Mohamed ₁ , Kheireddine Rifai _{2,

3} , Samira Selmani ₃ , Marc Constantin ₁ , François R. Doucet ₂ , Lütfü Ç. Özcan ₂ , Mohamad Sabsabi ₄ , François Vidal ₃

Affiliation

Standard techniques for geochemical and mineralogical characterisation are time-consuming, they can involve significant sample preparation and they are prone to error. The aim of this work is to show how the emerging fast laser-induced breakdown spectroscopy (LIBS) technique can be valuable for mineral exploration. For this purpose, the well-established micro-X-ray fluorescence (µ-XRF) technique was used to validate the LIBS data. Two ore samples from the platinum-group elements (PGE) Lac des Îles mine (Ontario, Canada) were analysed both by LIBS and µ-XRF. The fast mineralogical and elemental mapping provided by LIBS allowed the identification of four major silicate phases (chlorite, bytownite, actinolite, hornblende) and four minor sulfide phases (Pd-bearing pentlandite, chalcopyrite, pyrrhotite, pyrite). Multi-element chemical mapping and mineral characterisation using µ-XRF corroborated the LIBS analyses for the composition, distribution and abundance of minerals in PGE ore samples. These findings demonstrate the ability of the LIBS technique to perform direct fast high-resolution mapping of the chemical and mineralogical composition of PGE ore samples. This work highlights the advantages of LIBS for this application of being much faster and more sensitive to trace elements (e.g., Pd), as well as to low atomic number elements.

中文翻译：

使用激光诱导击穿光谱和微 X 射线荧光法对铂族元素矿石样品进行化学和矿物学绘图

地球化学和矿物学表征的标准技术非常耗时，它们可能涉及大量的样品制备，并且容易出错。这项工作的目的是展示新兴的快速激光诱导击穿光谱 (LIBS) 技术对矿产勘探的价值。为此，使用成熟的微 X 射线荧光 (μ-XRF) 技术来验证 LIBS 数据。LIBS 和 µ-XRF 分析了来自铂族元素 (PGE) Lac des Îles 矿（加拿大安大略省）的两个矿石样品。LIBS 提供的快速矿物学和元素映射允许识别四个主要的硅酸盐相（绿泥石、副敦石、阳起石、角闪石）和四个次要的硫化物相（含 Pd 的镍黄铁矿、黄铜矿、磁黄铁矿、黄铁矿）。使用 µ-XRF 进行的多元素化学绘图和矿物表征证实了 LIBS 对 PGE 矿石样品中矿物的组成、分布和丰度的分析。这些发现证明了 LIBS 技术能够对 PGE 矿石样品的化学和矿物组成进行直接快速高分辨率绘图。这项工作突出了 LIBS 在这一应用中的优势，即对痕量元素（例如，Pd）以及低原子序数元素更快速和更敏感。

更新日期：2021-05-07

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