報告
鳥取県淀江の珪長質片麻岩中の亜鉛に乏しい鉄スピネル
2021 年 127 巻 12 号 p. 733-736
詳細
2021 年 127 巻 12 号 p. 733-736
Gneissose rocks exposed at the Yodoe area, northwestern flank of Mt. Daisen, Tottori Prefecture have been considered as western extension of the Hida metamorphic rocks in the Hida Mountains. We describe a new occurrence of hercynite [(Fe2+,Mg,Zn,Mn)(Al,Fe3+)2O4] in garnet-bearing felsic gneiss from the Yodoe area. Green hercynite occurs exclusively as inclusions in garnet, and is not in direct contact with quartz. The Fe2+/(Fe2+ + Mg + Zn + Mn) and Al/(Al + Fe3+) values of the hercynite are 0.84-0.85 and 0.91-0.92, respectively. The hercynite is characterized by low ZnO content (2.21-2.41 wt%).
