ISSN ■ 340-74■ 4 OKAYAMA UNIVERSiTY Earth Scier Vol.4, No.1, 1997 CONTENTS ◆ Three― dilnensional structure of P wave velocity in the crust and up beneath southwest Japan Takeshi TANAKA and Hitosh ODA .....・ ・・・・・・・・・・・' Landsllde occurrence and geology of the ttliassic Nariwa Group,Southwest Japan Shu HOTANI,Shigeyuki SUZUKI,Hajime TANAKA and■ 求uya YAMADA . Ferroglaucophane schist frollll the Ohsa‐ yama area, Okayama Prefecture,Japan Trjshio NOZAKA.....・ ・・・・・・・・・・・・・・・・・・・・・・ Structural modincatiOn of KAlSiC)4 1ninerals ■lasuhiko OKAMOTO ......・ ・・・・・・・・・・・・・・・・・・ On the plasticity oF Si一 〇 framework of alkali zinc silicates Shizuo KOHARA and Akira KAヽ ヽ生 HARA .....・・・・・・・・・・・ IIial calculations of relating the equilibriu■ ■states of lninerals to the descriptive IIlineralogy Akira KAヽ ヽ独HARA .....・・・・・・・・・・・・・・・・・・・・・ ◆ 21 33 41 73 Departlnent of Earth Scienc Faculty of Science,OKAYAMA UNIVE Tsushima― Naka 3chome l-1,OKAYAMA 700-