伊豆半島西・南部地域火山岩類の岩石学的および化学的性質

概要

論文の詳細を見る
In the Izu Peninsula, Quaternary volcanoes arearranged apparently on two lines of NE direction. The volcanoes of Ida, Daruma, Tanaba, and Irozaki alkali basalts distribute on the west line in the peninsula (Fig.1). Most of the rocks of those volcanoes range in composition from basaltic andesite to andesite. Only a little alkaline basalt is represented in the southern end of the peninsula. Microscopically, the following rock types are distinguished: olivine-bearing two-pyroxene andesite (type Yd) for Darnma Volcano, olivine-augite andesite〜basaltic andesite (IVc,IVb→c) for Ida Volcano, olivine-bearing hypersthene andesite (IId→c) for Tanada. Volcano, two-pyroxene andesite (Vc, Vd→c) for Tenshi and Jaishi Volcanoes, and olivine-augite basalt (IVb) of the Irozaki alkali basalts.
特定非営利活動法人日本火山学会の論文
1976-08-15