凝灰岩

Xiangshan volcano-intrusive complexes is the wall rock of the biggest volcanic-rock uranium ore deposit in China, and the main body is rhyolitic porphyroclastic lava, accompanied by hypahyssal or ultra-hypabyssal intrusive rocks such as dacite-porphyry and granite-porphyry Jiulongzhang volcano-intrusive complexes are dominantly rhyolitic welded tuff, accompanied by dacite-porphyry and quartz monzonite-porphyry, and so on, and the uranium resources are being assessed.

相山火山－侵入杂岩是华南地区最大的火山岩型铀矿赋矿围岩，其主体岩石为流纹质碎斑熔岩，浅成－超浅成侵入岩有英安斑岩、花岗斑岩等；九龙嶂火山－侵入杂岩的铀资源潜力尚待评价，主体岩石为流纹质熔结凝灰岩，浅成－超浅成侵入岩有英安斑岩、石英二长斑岩等。

We can see copper-bearing asphalt amygdaloidales in the basalt lava and stockwork of native copper in the carbon-rich tuff. There area so much carbon in the ores that people only can see the native copper aggregate after splitting and polishing the ores.

最近，在该熔岩层上下的凝灰岩中鉴别出难识别矿化类型，即与沥青和有机质碳紧密伴生的富铜矿石，甚至在气孔状熔岩中发现呈杏仁体含铜沥青，因而可能构成大规模矿化。

The main body of the outcropping rock layer is composed of deep gray trachyte of Baitoushan formation of mid-Pleistocene series and yellow, brown yellow volcanic-tuff crust of weather. This kind of structure that weak layers and hard layers emerge alternately contributes to the instability of rock mass.

长白山一带出露的地层主体为中更新统白头山组深灰色粗面岩及黄色、褐黄色火山凝灰岩、火山灰风化壳，这种软硬相间的层状地层组合为岩体的失稳创造了条件，岩体失稳产生的堆积物为泥石流准备了充足的固体物质。

Igneous stratum can be divided into three belts, from east to west it lays igneous rock belt, transition rock belt and sedimentary rock belt, from lower to upper it lays tuff belt, trachyte belt and basalt belt.

研究发现火山岩系在横向和纵向上都可划分为三个带，横向由东到西为火山岩带、过渡带、正常沉积岩带，纵向自下至上分为凝灰岩带、粗面岩带、玄武岩带。

The Shengmikeng vein-type lead-zinc deposit is located in Huanggangshan volcano-tectonic depression of the Mesozoic volcanic belt in Northern Wuyi.The ore featured by veinlets and disseminations is hosted both inside the fault zone in the upper Jurassic Ehuling ignimbrite and the potassic trachyte porphyry.

摘 要：生米坑铅锌矿床位于北武夷中生代火山岩带的黄岗山火山盆地内，已知铅锌矿体呈脉状产于侏罗系上统鹅湖岭组流纹质熔结凝灰岩的断裂内，或呈细脉——浸染状分布于钾质粗面斑岩内，发育钾长石化、绿泥石化、硅化等蚀变。

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 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 adsorption characteristics of 237 Np on crushed tuff and tuffaceous sand from northeast Japan have been studied using sequential extraction analysis technique.

用连续提取法研究了2 37Np在破碎凝灰岩和凝灰质砂上的吸附。

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？

Field geological investigation, petrology and geochemistry study showed that three oil shale groups in Kazuo basin were developed in Member 1,2,3 of the Jiufotang Formation of Lower Cretaceous, the third oil shale group located in 3rd member have the greatest industrial significance. Oil shale always has the accompanying relationship with overlying sedimentary tuff or other tuffaceous strata.

野外地质调查和岩石学、地球化学研究表明：喀左盆地3个油页岩层群分别发育于下白垩统九佛堂组的一、二、三段，以位于三段的第三油页岩层群的工业意义最大；油页岩常与上覆沉凝灰岩或其它凝灰质岩石呈伴生关系。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失