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Best Article Award 2007, Society of Resource Geology, presented to Etsuo Uchida, Sho Endo and Mitsutoshi Makino: Relationship Between Solidification Depth of Granitic Rocks and Formation of Hydrothermal Ore Deposits. Resource Geology, 57, 47–56

This paper presents analytical data on biotite from representative granitic rocks in Japan. It was found that total Al content of biotite changes with the metal type of the accompanying hydrothermal ore deposits and in the following order: Pb-Zn and Mo deposits < Cu-Fe and Sn deposits < W deposits < nonmineralized granitic rocks. A good positive correlation was obtained between the total Al content of biotite and the solidifi cation pressure of the granitic geobarometers. From these relationships, the equation representing the relationship between total pressure (P) and total Al content of biotite ( T Al) was derived. This is given by: