Rare earth element mineralizations in the Palabora Carbonatite Complex

帕拉博拉碳酸岩杂岩中的稀土元素矿化

• 批准号: 288401847
• 负责人: Privatdozent Dr. Michael Marks
• 金额: --
• 依托单位: Arbeitsgruppe Geologie und Geodynamik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/288401847?language=en
• 关键词: Rare; earth; element; mineralizations; Palabora

Carbonatites represent the most important source for REE, which play a key role for many modern, especially green technologies. Therefore, the detailed understanding of where and how carbonatite-related REE deposits form is critical to mineral exploration and future development of these important resources. This project will systematically investigate the so-far barely documented REE mineralization of the Palabora Carbonatite Complex (PCC) in South Africa. The PCC is a perfectly suited research object to answer important questions concerning carbonatite-related REE mineralizations because of its mineralogicaly variable and multi-stage REE-mineral assemblages and the unique possibility to systematically investigate mineralogical changes with respect to REE-minerals over a vertical distance of about 1500 m. Detailed petrography, EMPA and LA-ICP-MS work will be performed to track spatial variations in the textural and compositional evolution of the various REE-mineral assemblages. Whole-rock analyses, including high quality REE data, will be carried out by XRF and ICP-MS, which will allow for identifying chemical variations through the complex. Characterization of fluid inclusions (microthermometry, Raman spectroscopy, gas chromatography-IRMS) will be combined with stable isotope data for rock-forming minerals, which will allow for deciphering the various fluid sources involved in the formation and remobilization of the various REE mineralizations. The results of this study will enhance our knowledge concerning the emplacement and the magmatic to hydrothermal evolution of carbonatitic systems and their associated REE mineralization with depth, including potential changes in physico-chemical parameters (e.g., P, T, pH, fO2, aH2O, aCO2, aHF, aHCl) and changing fluid sources, which may have direct consequences on the type of REE-mineral assemblage.

碳酸盐是REE的最重要来源，它对许多现代，尤其是绿色技术的关键作用。因此，对与碳酸盐岩相关的REE沉积物形成的何处以及如何形成的详细理解对于这些重要资源的矿物勘探和未来开发至关重要。该项目将系统地调查南非Palabora Carbonatite Complex（PCC）几乎没有记录的REE矿化。 PCC是一个非常适合的研究对象，可以回答有关与碳酸盐相关的REE矿化的重要问题，因为其矿物质变量和多级REE REE-Mineral组合以及在垂直距离近约1500 m的Ree-Minerals方面有系统地研究矿物学变化的独特可能性。将进行详细的岩石学，EMPA和LA-ICP-MS工作，以跟踪各种REE-Mineral组合的质地和组成演化中的空间变化。 XRF和ICP-MS将进行全摇滚分析，包括高质量的REE数据，这将允许通过复合物识别化学变化。流体夹杂物（微热法，拉曼光谱，气相色谱-INRS）的表征将与稳定的同位素数据结合使用，用于岩石形成矿物质，这将允许解密各种REE矿化的形成和重新启动中所涉及的各种流体来源。 The results of this study will enhance our knowledge concerning the emplacement and the magmatic to hydrothermal evolution of carbonatitic systems and their associated REE mineralization with depth, including potential changes in physico-chemical parameters (e.g., P, T, pH, fO2, aH2O, aCO2, aHF, aHCl) and changing fluid sources, which may have direct consequences on the type of REE-mineral assemblage.