adj.安山岩的
The volcanics are most commonly andesitic in composition. 火山岩的组成最通常是安山岩。
The ore-bearing rock is composed mainly of andesitic tuff and tuffite. 作者在赋矿层中首次发现了层状电气石岩。
A detailed petro-logical study indicates that most of the zigzag clasts were generated by in-situ quench fragmentation of andesitic magma. 研究表明，该熔积岩的角砾为岩浆遇水后快速淬火、裂解的产物，铁硅质组合为海底喷气沉积形成的含铁建造；
This area consists of cataclastic andesitic tuff, altered volcanic rock, slightly altered and cataclastic anisomerous sandstone, slump breccia, and silt bearing cataclastic tuffaceous shale. 其主要由一套碎裂安山凝灰岩、蚀变火山岩、轻微蚀变碎裂不等粒砂岩、坍塌角砾岩、含粉砂碎裂凝灰质泥岩等组成。
1. The volcanics are most commonly andesitic in composition. 火山岩的组成最通常是安山岩。
