南岭科学深钻NLSD-2红外光谱及XRF元素特征

    Infrared spectroscopy and XRF elemental characterization of Nanling scientific deep drilling NLSD-2

    • 摘要: 南岭科学深钻NLSD-2作为我国深部资源探测的关键工程之一,对研究南岭盘古山钨矿深部地质特征及成矿规律具有重要意义。首次系统集成红外光谱(400~2 500 nm)、XRF元素扫描及电子探针技术,揭示深部矿物组合分布、元素富集特征及白云母成矿温度演化规律。研究结果表明: 钻孔岩性界面可通过红外光谱识别的石英、白云母、绿泥石等矿物组合进行有效区分; XRF元素分析显示,W、Pb、Zn等成矿元素在变质砂岩层及花岗岩顶部显著富集,与钨矿矿体空间分布一致; 白云母短波红外光谱特征受化学成分及成矿温度共同影响。结合根据电子探针数据计算的温度,认为成矿相关白云母以Pos2200在2 204 nm附近,相对中间成矿温度,相对富Al及贫Si、Fe、Mg为特征。研究证实了红外光谱与XRF技术对深部矿化信息提取的高效性,但脉状矿化识别需结合成像光谱技术。研究成果为南岭钨矿深部找矿提供了矿物-元素-温度多维标志,推动了深部资源勘探技术的创新。

       

      Abstract: Nanling scientific deep drilling NLSD-2 is one of the key projects for deep resource exploration in China, which has great significance for understanding the deep geological characteristics and metallogenic regularity of Pangushan tungsten deposit in Nanling. The infrared spectroscopy (400~2 500 nm), XRF elemental scanning and electron microprobe techniques were systematically integrated for the first time in this research to reveal the distribution of deep mineral assemblages, element enrichment characteristics and the evolution of Muscovite metallogenic temperature. The results show that the lithological interfaces can be effectively distinguished by the mineral assemblages such as quartz, muscovite and chlorite identified by infrared spectroscopy. The XRF element analysis shows that W, Pb, Zn and other metallogenic elements are significantly enriched in the metamorphic sandstone layer and the top of the granite, which is consistent with the spatial distribution of the tungsten ore body. The short-wave infrared spectral characteristics of muscovite are affected by chemical composition and metallogenic temperature. The ore-forming related muscovite is characterized by at around Pos2200 near 2 204 nm, relative intermediate ore-forming temperature, rich in Al and poor in Si, Fe, Mg relatively, combined with the electron microprobe temperature. This study has confirmed the high efficiency of infrared spectroscopy and XRF technology in extracting deep mineralization information, but the identification of vein mineralization needs to be combined with imaging spectroscopy. The results could provide a multi-dimensional symbol of mineral-element-temperature for deep tungsten prospecting in Nanling, and promote the innovation of deep resource exploration technology.

       

    /

    返回文章
    返回