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江西宜春雅山岩体位于钦杭成矿带东段萍乡-绍兴结合带西端,是华南地区最重要的铌钽矿化稀有金属花岗岩之一(杨泽黎等,2014)。矿区主要出露地层包括新元古界板溪群、震旦系和寒武系千枚岩和变质砂岩,岩体侵位于其中的震旦系变质砂岩中(Yin et al.,1995)。锆石U-Pb同位素定年表明,雅山岩体的形成年龄为约155 Ma,属于燕山早期岩浆活动的产物。雅山岩体为一经多阶段演化形成的复式花岗岩体,岩体从早到晚、从下而上至少可分为:(1)中
The Yashan rock in Yichun, Jiangxi Province is located at the western tip of Pingxiang-Shaoxing belt in the eastern part of Qinhang metallogenic belt and is one of the most important niobium-tantalum mineralized rare-metal granites in South China (Yang et al., 2014). The major exposed formations in the mine area include the Neoproterozoic Banxi Group, Sinian and Cambrian phyllites and metamorphic sandstones in which the intrusions are located in Sinian metamorphic sandstones (Yin et al., 1995). The zircon U-Pb isotopic dating indicates that the Yashan pluton was formed at a age of about 155 Ma and belongs to the product of early Yanshan magmatic activity. The Yashan rock mass is a multi-granite body formed after multi-stage evolution. From top to bottom, the rock mass can be divided into at least (1)