volcanic breccia

Pyroclastic rocks are mainly composed of volcanic breccia and tuff.

火山碎屑岩，包括火山角砾岩和凝灰岩；

There are Cenozoic continental intermediate and acid volcanic rocks in the Tianshui area, western Qinling. The rocks are mainly composed of rhyolite, parts of rhyolitic ignimbrite ( breccia tuff), a little amount of breccia tuff and volcanic agglomerate.

西秦岭甘肃天水地区分布的新生代陆相中酸性火山岩，主要由流纹岩、部分流纹质熔结（角砾）凝灰岩及少量角砾凝灰岩、火山集块岩等组成。

Sedimentary pyroclastic rocks are mainly sedimentary tuff and sedimentary volcanic breccia.

沉火山碎屑岩，包括沉凝灰岩和沉火山角砾岩。

These deposits were, when being formed, controlled by volcanic structures ( volcanic dome and volcanic breccia pipe), fault structures ( NE and NW trending), gabbro porphyrite body and depression in depression.

火山穹窿、爆发角砾岩筒等火山构造，NE向、NW向断裂构造，辉石闪长玢岩体，洼中洼环境等对成矿具有控制作用。

A great mumber of melt inclusions are there in the quartz phenocrysts. The ore bodies of Emei pyrophyllite are located in rhyolitic crys-tal fragment tuff, ignimbrite and volcanic breccia ( agglomerate)-bearing tuff.

石英晶屑内熔融包裹体发育。峨嵋矿区矿体赋存于流纹质晶屑凝灰岩、熔结凝灰岩、含火山角砾（集块）凝灰岩中。

Xiangluwanzi gold deposit is a volcanogenic hydrothermal ore deposit related to volcanic cryptoexplosive breccia body.

香炉碗子金矿是一与火山隐爆角砾岩体有关的火山热液型金矿床.

The thrid part are tuff, ferruginous dolomite, crystal tuff and volcanic breccia.

第三段以凝灰岩、铁质白云岩、晶屑凝灰岩、火山角砾岩为主。