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Mineralization characteristics of uranium-bearing tuff, Zoujiashan ore district,Xiangshan uranium ore field;

相山铀矿田邹家山工区含铀凝灰岩的矿化特征

Study of water-rock interaction for tuff sandwich decency in some dam-site of Jinsha river;

金沙江某坝址凝灰岩夹层风化的水—岩作用

Characteristics and Forming Environments of Tuffs in Yanchang Formation in Ordos Basin;

鄂尔多斯盆地延长组凝灰岩夹层特征和形成环境

In the Mesozoic volcanic belt of Cuntinent of Southeastern China and basin of the Middle-Lower Yangtze River exists tufflava t which was once named as rhyolite, dacite, ignimbrite and liquation ignimbrite.

本文通过对长江中下游地区的溧水、宁芜等火山岩盆地、浙闽粤中生代火山岩带、广西等地的凝灰熔岩地质体的宏观和微观特征研究，总结了凝灰熔岩的相特征，建立了二相成因模式。

The biaxial shear rheological experiment on tufflava with grades II–V is carried out with tunnel surrounding rock of Shenzhen Lianyan Highway.

结合深圳莲盐高速公路隧道围岩中的II～V级凝灰熔岩进行了双轴剪切流变试验,通过试验结果分析和模型辨识,得到不同围岩级别凝灰熔岩的剪切流变规律和流变模型。

The tuffaceous blanketed the entire basin.

凝灰岩充填着整个盆地。

A light - colored tuff used in hydraulic cement.

粗面凝灰岩一种用来生产硬水泥的淡色凝灰岩

The main kinds of rocks include carbonate rocks, tuffite, siliceous rocks and quartz sand-stone.

主要岩石类型包括碳酸盐岩、沈积凝灰岩、矽质岩和石英砂岩。

A volcanic rock formed by the welding together of tuff material from an explosive volcanic eruption.

熔结凝灰岩火山喷发后凝灰物质聚集后形成的一种火成岩

Calcareous tufa, a porous or spongy deposit of calcium carbonate found in calcareous mineral springs.

多孔状凝灰岩石灰质的凝灰岩，碳酸钙多孔或有吸收性的沉淀物，出现在石灰性矿物泉中

A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.

凝灰岩致密火山灰构成的岩石，大小以细粒至粗砾石不等

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?铡?

They reported the abnormal uranium content of waters issuing from tuffaceous rocks.

他们发现，从凝灰岩中流出的水中铀含量反常。

The concept holds that uranium is leached by groundwater from tuffeceous rocks.

该理论认为, 来自凝灰岩的地下水淋蚀铀。

LEACHING CHARACTERISTICS OF A TUFF TYPE URANIUM ORE RICH IN FLUORITE

富含萤石凝灰岩类型铀矿石的浸出特性

THE MECHANISM RESEARCH FOR THE CROSSLINKED EMULSION FRACTURING STEADYING THE TUFFACEOUS RESERVOIR

交联乳化压裂液稳定凝灰岩储层机理研究

Experimental Study on Fluid Permeation Evolution in Whole Failure Process of Tuff

凝灰岩破坏全过程渗流演化规律的实验研究

The studies showed that (1) HFW are found in vocalnic tuff while the others in sedimentary rocks;

(1)前者产出层位是陆相火山爆发相的凝灰岩,后者是河湖相沉积岩;

The volcanic rocks belong to the cal-alkaline series and petrochemistry and geochemistry show characteristics of island arc volcanic rocks.

酸性熔岩及同质凝灰岩，属钙碱性系列，且高钾富铝。

Tuffite is formed by the combination of volcanic ashes and carbonate mud.

沈积凝灰岩主要为中远源的火山灰与碳酸盐灰泥混合而成，含石英团块，显斑点构造。

The Machadodorp tuff and agglomerate, which is higher-lying than the Ongeluck lave, is known only from the Eastern Transvaal.

层位较昂格鲁克岩流为高的马却多多普凝灰岩及集块岩，只见于德兰士瓦东部。

They were deposits of volcanic tuff in Nye County, Nevada;

3处场地分别是内华达州奈伊县的火山凝灰岩矿床层；

THE DEVELOPMENT AND APPLICATION IN AGRICULTURE PRODUCTION OF CIYING PALAEOGENE INTERMEDIATE-ALKALINE TUFF,QUJING

曲靖茨营下第三系中-碱性凝灰岩在农业生产中的开发应用