【摘 要】
：
The Laoshan A-type granite is a highly evolved granite body. The study on accessory minerals indicates that there exist differentiation and accumulation of flui
【机 构】
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Department of Earth Sciences and State Key Laboratory for Mineral Deposits Research,Department of Oc
【基金项目】
：
国家自然科学基金;科技部资助项目
论文部分内容阅读
The Laoshan A-type granite is a highly evolved granite body. The study on accessory minerals indicates that there exist differentiation and accumulation of fluids during the late stage of evolution of the granite. The released fluids are rich in rare-earth elements (REE),high-field- strength elements (HFSE,such as Nb,Ta,Zr,Hf,Th,U,and Y) and volatiles (F,P,CO2,etc.). Owing to the presence of fluid,accessory mineral assemblages have changed during the evolution of A-type granite,and are especially characterized by large amounts of independent REE-Nb-Y-Th minerals present in the late facies. Late-accumulation of fluids may be of the general feature of A-type granites,at least of highly evolved ones.
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