湘南尖峰岭岩体伟晶岩壳矿物特征与成因机制:来自云母和石英成分的约束

Key Points

• The study aims to reveal the formation mechanisms of pegmatitic shells and their connection to rare metal mineralization in the Xiangnan Mountain granite.
• Utilized techniques like cathodoluminescence (CL), electron probe microanalysis (EPMA), and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS)
• Conducted systematic analysis of quartz and mica structures as well as major and trace element geochemistry
• Characterized quartz into four types and mica into three stages to elucidate mineral transformations
• Quartz types Q1 to Q4 show a decreasing trend in Ti content and increasing Ge levels, indicating evolution from magmatic to hydrothermal environments.
• Mica transitions from biotite (M1) to lepidolite (M2), and eventually to muscovite (M3), with respective increases in Al and Si and decreases in Sn, W, Nb, and Ta.
• The study concludes that the pegmatitic shell reflects a complete evolution from high-temperature magmatic crystallization to low-temperature hydrothermal alteration, confirming its role in concentrating volatile elements.