Combined XRF, XRD, SEM-EDS, and Raman Analyses on Serpentinized Harzburgite (Nickel Laterite Mine, New Caledonia): Implications for Exploration and Geometallurgy,ACS Earth and Space Chemistry

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Combined XRF, XRD, SEM-EDS, and Raman Analyses on Serpentinized Harzburgite (Nickel Laterite Mine, New Caledonia): Implications for Exploration and Geometallurgy
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2019-08-22 , DOI: 10.1021/acsearthspacechem.9b00014
Yassine El Mendili _{1,

2} , Daniel Chateigner ₁ , Beate Orberger ₃ , Stéphanie Gascoin ₁ , Jean-François Bardeau ₄ , Sébastien Petit ₁ , Cédric Duée ₅ , Monique Le Guen ₆ , Henry Pilliere ₇

Affiliation

Different techniques have been combined to determine the crystallography and the chemical composition of serpentinized harzburgite sampled in a drill core coming from the lower part of the New Caledonia ophiolite. Specifically, this serpentinized harzburgite is the common bedrock of most of the nickel laterite mines in New Caledonia. Most of the minerals present in serpentinized harzburgite were analyzed by Raman spectroscopy and XRD. In this study, Raman spectroscopy has been applied for the first time to estimate the nickel content in lizardite, forsterite, talc, and goethite. The analyses confirm that the major serpentine minerals show two varieties: (1) Ni-bearing lizardite and (2) Ni-free lizardite. Furthermore, Ni-rich forsterite, enstatite, Ni-rich talc, sepiolite, periclase (MgO), and quartz were detected. Additionally, Raman spectroscopy evidence minor phases not detected by XRD: anatase, rutile, pyrite, hematite, chromite, magnesiochromite, and Ni-rich goethite. Our results show that the Ni substitution is only present in lizardite exhibiting turbostratic-stacking disorder. This finding has potential for being used as an exploration tool using short-wave-infrared spectroscopy online or as a portable instrument, and for defining geometallurgical parameters for processing these complex ores.

中文翻译：

蛇纹石化的Harzburgite（新喀里多尼亚镍红土矿）的XRF，XRD，SEM-EDS和拉曼分析相结合：对勘探和地质冶金的意义

结合了不同的技术来确定从新喀里多尼亚蛇绿岩下部钻取的岩心中蛇纹石化的Harzburgite的晶体学和化学组成。特别是，这种蛇纹石化的Harzburgite是新喀里多尼亚大多数镍红土矿的共同基岩。通过拉曼光谱和X射线衍射分析了蛇纹石化的Harzburgite中存在的大多数矿物。在这项研究中，拉曼光谱法首次用于估算蜥蜴石，镁橄榄石，滑石和针铁矿中的镍含量。分析证实，蛇纹石的主要矿物具有两种变体：（1）含镍蜥蜴石和（2）无镍蜥蜴石。此外，还检测到了富镍镁橄榄石，顽辉石，富镍滑石，海泡石，镁橄榄石（MgO）和石英。此外，拉曼光谱法证明XRD无法检测到次要相：锐钛矿，金红石，黄铁矿，赤铁矿，亚铬铁矿，镁铬铁矿和富镍针铁矿。我们的结果表明，Ni取代仅存在于呈现涡轮层堆积紊乱的蜥蜴石中。这一发现有潜力被用作在线使用短波红外光谱仪的勘探工具或便携式仪器，并可以定义用于处理这些复杂矿石的地质冶金参数。

更新日期：2019-08-22

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