Finding of vanadium-bearing garnet from the Sor Rondane Mountains, East Antarctica

• Main Authors: Yasuhito Osanai, Teiichi Ueno, Noriyoshi Tsuchiya, Yuhei Takahashi, Yoshiaki Tainosho, Kazuyuki Shiraishi
• Format: Article in Journal/Newspaper
• Language: English
• Published: National Institute of Polar Research 1990
• Subjects: geo; East Antarctica; Sor-Rondane; Sor Rondane Mountains; Menipa; Antarc*; Antarctica
• Online Access: https://doi.org/10.15094/00008687; https://doaj.org/article/736752d677f243b0a7fd4b7a21af9ab3

Vanadium-bearing green garnets have been found in the Menipa mountain mass, central part of the Sor Rondane Mountains, East Antarctica. These garnets are the main constituent minerals of granulite-facies metamorphosed graphite-bearing calcareous metapelite. They show three types of mode of occurrence as follows; i) large porphyroblast (type-1), ii) fine crystal (type-2) in kelyphite rim around type-1 garnet, and iii) fine-grained porphyroblast (type-3) in matrix. These three types of vanadium-bearing garnets exhibit distinct characters in chemical compositions. The V^, Cr^ and Fe^ contents in these garnets increase from type-1 to type-3 through type-2 with increasing consistency of green color, while the Cr_2O_3/V_2O_3 and Fe_2O_3/V_2O_3 ratios are constant. Therefore, the form of cation substitution in vanadium-bearing garnets is shown as 4V^, (Cr^, Fe^)⇋5Al^. Modes of occurrence and chemical characteristics of vanadium-bearing green garnets are described here, and physical properties of these garnets are also examined.