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.

碳酸盐岩是稀土元素最重要的来源，对许多现代技术，特别是绿色技术起着关键作用。因此，详细了解与碳酸盐岩有关的稀土矿床形成的地点和方式，对这些重要资源的矿产勘探和未来开发至关重要。该项目将系统地研究迄今鲜有文献记载的南非帕拉博拉碳酸盐岩杂岩(PCC)的稀土矿化。PCC是一个非常适合回答与碳酸岩有关的稀土矿化的重要问题的研究对象，因为它的矿物学变量和多阶段的稀土矿物组合，以及唯一可能系统地研究垂直距离约1500米范围内的稀土矿物的矿物学变化。将进行详细的岩相学、EMPA和LA-ICPMS工作，以跟踪各种稀土矿物组合的结构和成分演化的空间变化。全岩分析，包括高质量的稀土数据，将由XRF和电感耦合等离子体质谱进行，这将允许识别整个杂岩中的化学变化。流体包裹体的表征(显微测温、拉曼光谱、气相色谱-红外光谱)将与造岩矿物的稳定同位素数据相结合，这将有助于破译各种稀土矿化形成和再活化所涉及的各种流体来源。这项研究的结果将加深我们对碳酸盐岩体系的侵位和岩浆-热液演化以及与之相关的稀土矿化随深度的认识，包括物理化学参数(如P、T、pH、fO2、aH2O、ACO2、AHF、AHCl)的潜在变化和流体来源的变化，这些变化可能对稀土矿物组合的类型产生直接影响。