论文部分内容阅读
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 Amtype as considered previously.
Tantalite, occurring as intergranular tabular crystals, was reported for the first time in the Suzhou granite. Electron microprobe analyzes 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 from isomorphic tapiolite by a remarked Ag Raman peak at 880 cm -1. The associated zircon is striking by significant enrichment of Hf, with the discovery of tantalite suggests that the Suzhou granite should be classified as a S-type granite instead of Amtype as considered previously.