The mine zone is sandwiched between an overlying block of flows, pillow lavas and minor pyroclastics, and underlying agglomerates, tuffs, and more massive diabase bodies . 含矿带夹在上覆的岩流、枕状岩流和少量火山碎屑岩块与下伏的集块岩、凝灰岩和块状辉绿岩体之间。
This kind of rock is called tuff 这里的岩质呢是凝灰岩。
The tuffaceous formation , isolated remnants , are about 200 - 250 ft thick 凝灰岩构造的局部残存段的厚度约为200 - 250 ? 。
The tuffaceous formation , isolated remnants , are about 200 - 250 ft thick 凝灰岩构造的局部残存段的厚度约为200 - 250 ?? 。