福島県東北部の霊山火山岩類の微量元素について〔予報〕
1980 年 75 巻 1 号 p. 10-13
詳細
1980 年 75 巻 1 号 p. 10-13
Eleven trace element contents, including seven REE, were preliminary determined for eight samples of the Ryozen volcanic rocks of Miocene age, northeastern part of Fukushima Prefecture. The results revealed that some of the Ryozen volcanic rocks (ol-basalt_??_auol-basalt) are characterized by high Cr contents ranging from 868 to 355 ppm. Thus, Ryozen volcanic rocks make a marked contrast to the Quaternary volcanic (tholeiitic) rocks of the Nasu zone with low Cr contents. The basalts have REE patterns characteristic to “Northeast Japan Type island arc tholeiite” defined by Masuda and Aoki (1978). Relationship between the Ryozen volcanic rocks and the Setouchi volcanics is briefly discussed.
