我国某地含褐钇钶矿碱性花岗岩的特征

The fergusonite alkaline granite referred to in this paper is a complex consisting of acmite-augite riebeckite granite, riebeckite granite and biotite riebeckite granite. Its principal rock-forming minerals include acmite-augite, riebeckite, quartz, perthite and biotite, with fergusonite, zircon, magnetite and galena as its accessary minerals. Astrophyllite and thorite are abundant in a late alkali granite dike. Petrochemically, it is rich in K, Na, Si, and such rare metals as Nb, Ta, Y, Yb, Zr and Hf, but depleted in Al and Ca. In comparison with that found in other types of granite, the fergusonite in the alkaline granite has higher ferromagnesian components, thorium, niobium, but lower rare earths and tantalum.     

Tantalite in Suzhou Granite：mineralogy and Geological Implications

Tantalite,occurring as intergranular tabular crystals,was reported for the first time in the Suzhou granite.Electron microprobe analyses show that it is rich in W and Ti,with a Ta/(Ta Nb) ratio ranging from 0.5 to 0.73 and a Mn(Mn Fe) ratio between 0.20 and 0.40.It is structurally distinct from isomorphic tapiolite by a remarked Ag Raman peak at 880cm^-1.The associated zircon is striking by significant enrichment of Hf,with the HfO2 content amounting up to 35%-40%,The discovery of tantalite suggests that the Suzhou granite should be classified as a S-type granite instead of A-type as considered previously.     

微粒微量稀有元素矿物化学全分析方法的研究——钶铁矿-钽铁矿族矿物的分析方法

钶铁矿-钽铁矿族矿物中铌和钽的含量高,在自然界分布广泛,是铌和钽的主要工业矿物之一。最近几年来,新的铌、钽矿床类型在我国相继发现,一般其中钶、钽铁矿的颗粒较细,为了研究其物质成分和进行工业评价,须付出很大的劳动,经过各种选矿方法和