奈良県川上村中奥に分布する火砕岩 (tuffite) 岩脈から見出された苦鉄質～中間質の本質岩片とその意義

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  • ナラケン カワカミムラ ナカ オク ニ ブンプ スル カサイガン tuffite ガン ミャク カラ ミイダサレタ クテツシツ チュウカンシツ ノ ホンシツガンペン ト ソノ イギ
  • Juvenile Fragments Derived from Mafic to Medium Magmas in Pyroclastic (Tuffite) Dike in Nakaoku, Central Kii Peninsula, SW Japan

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Abstract

Felsic pyroclastic (tuffite) dikes in Nakaoku area, central Kii peninsula, include basaltic to rhyolitic fragments in composition. Those fragments are irregular or amoeboid in shape, indicating that all the fragments are juvenile. This paper presents macroscopic and microscopic descriptions and bulk chemical compositions of the fragments, implying the close relationship between mafic and felsic magmas in time and space during the middle Miocene in Nakaoku.

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