角砾凝灰岩

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。

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 .

主要岩石类型有玄武岩、高铝玄武岩、高钾安山岩、英安岩、流纹岩及流纹质角砾凝灰岩。

The volcanic rocks mainly include basalt , high-Al basalt , andesite , dacite , rhyolite and / or rhyolitic pyroclastic rocks .

矿床产于近喷发间歇期的石英角斑质角砾凝灰岩中，受火山洼地和同生断裂控制。

The deposit occurs in quartz keratophyric breccia and tuffs formed in intermittent period , and controlled by volcanic depression and synchronous fractures .

岩石类型为流纹岩、英安岩和沉火山碎屑岩，其中的熔结角砾凝灰岩是本次1∶5万区调中的新发现。

The rock types include rhyolite , dacite and sedimentary volcaniclastic rocks , among which the lava tuff breccia was newly discovered in the 1 ∶ 50 000 region .

坝址区右岸岩体，总体上为片理化变质火山角砾岩夹变质凝灰岩（T3xd）和板岩（J2h）构成的薄层（板）状大角度横向倾向坡内地质结构。

The rock mass of the right bank slope in dam area generally are metamorphosed volcanic breccia with metamorphic tuff ( T3xd ) and slate ( J2h ) which consisted the geological structure of transverse wide-angle inclined slope .

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。

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 .