熔结凝灰岩

广东海南岛石碌铁矿富钾流纹质熔结凝灰岩的发现及其意义

Discovery of potassium-rich rhyolitic ignimbrite in the Shilu iron ore deposits of Hainan Island and its significance

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 .

熔结凝灰岩的Gd元素含量比熔岩高；

Simultaneously , the content of Gd in tuff rock is higher than that in lava .

对于峰值应变，熔结凝灰岩、花岗岩的峰值应变随温度的升高而大幅度的增加；

For tuff and granite , the peak strain increases with temperature .

熔结凝灰岩的液态熔离&泡沫熔岩流成因

Ignimbrites from liquid immiscibility : origination of pumiceous lava flow

民乐浸染状铜矿产于中三叠统灰流型富钠质熔结凝灰岩中。

The Minle disseminated Cu deposit is occurred in the Middle Triassic Narich ash flow ignimbrite .

浙江熔结凝灰岩的特征

Characteristics of ignimbrites in Zhejiang Province

高孔隙度的火山角砾岩、熔结凝灰岩、砾岩与砂岩提供了热液活动和铜沉淀空间。

Volcanic breccias , ignimbrites , conglomerates and sandstones with high porosity provided space for hydrothermal activation and copper precipitation .

郭家屯铅锌矿成矿时代为燕山期，成矿作用与燕山期陆相火山活动有关，成矿金属元素主要来自于熔结凝灰岩和花岗岩。

The mineralization is linked to the activities of continental volcanic rocks . And the metallogenic material come from the tuff and granite .

矿化蚀变过程中稀土元素有从熔结凝灰岩向铅锌矿体和花岗岩方向迁移的趋势。

There had a trend that the rare earth elements in the tuff were transported to the ore and granite in the process of mineralized alteration .

火山岩中流纹岩和熔结凝灰岩的孔隙度、渗透率一般较高，玄武岩、安山岩、粗面岩和凝灰岩的孔隙度、渗透率略低。

The porosity and permeability of rhyolite and self-fused tuff in lava are generally higher , while they are lower in basalt , andesite , trachyte and tuff .

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 .

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 .