On the basis of detailed studies on columbite from the Suzhou granite, tantalite has been found for the first time in this granite. It occurs as intergranular tabular crystals. Electron micro-probe analyses show that tantalite has the Ta/(Ta+Nb) atomic ratio = 0. 50 - 0. 73 and the Mn/ (Mn+Fe) ratio=0. 20 - 0. 40, and is enriched in W and Ti. Laser micro-Raman probe analysis has been used to distinguish structurally this mineral species from isomorphic tapiolite. The result shows that the Ag Raman peak at 880 cm-1 is remarkable for tantalite. The associated zircon exhibits high enrichment in hafnium (HfO2 content being up to 35%- 40%). The occurrence of tantalite in the Suzhou granite could suggest that this granite is of S -type rather than of A -type, as considered traditionally up to date.
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王汝成,徐士进,Francois FONTAN,林承毅.1996.苏州花岗岩中钽铁矿的发现及其地质意义[J].地质论评,42(4):373-379,[DOI]. Wang Rucheng, Xu Shijin.1996. DISCOVERY OF TANTALITE IN THE SUZHOU GRANITE AND ITS GEOLOGICAL SIGNIFICANCE[J]. Geological Review,42(4):373-379.