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  -quartz
Migration Paths of Helium in α-Quartz and Vitreous Silica from Molecular Dynamics Data
      
The helium diffusion in α-quartz and vitreous silica is studied by the molecular dynamics method.
      
The helium diffusion in α-quartz and vitreous silica is described.
      
Empirical relationships describing the composition dependences of the chemical durability of glasses in the diopside-albite, diopside-anorthite, diopside-orthoclase, diopside-quartz, and diopside-feldspar systems are derived.
      
A detailed examination of the experimental and model ARDFs has revealed that the interatomic distances for all atoms belonging to one helical chain in the glass are identical to those in the β-quartz crystal over the entire ordering range.
      
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The test for quartz from a gold deposit in Hebei province of China by a improved decrepitation instrument gives much information for mineralization and exploration The results of test are as follow: When quartz is heated to 573℃, α quartz will be transformed into β quartz some samples may produce α-β peaks whose characters and appearance rates are related to the minerogenetic location,which can be used to decide the stripped degree of veins A parameter-depth model of α-β peak has been built for the mined...

The test for quartz from a gold deposit in Hebei province of China by a improved decrepitation instrument gives much information for mineralization and exploration The results of test are as follow: When quartz is heated to 573℃, α quartz will be transformed into β quartz some samples may produce α-β peaks whose characters and appearance rates are related to the minerogenetic location,which can be used to decide the stripped degree of veins A parameter-depth model of α-β peak has been built for the mined veins,thus the stripped degree and gold resources of unknown similar veins are evaluated The decrepitation temperature of the head peaks is related to the gold content The lower the Td value is,the higher the gold content is ,which is useful in evaluating the gold content of quartz vein The results have been verified in some large gold deposits in Shandong province of China Decrepitation activity(h) is related to the structural stress,the gold content of vein and the origin of quartz The h-values of the quartzs that were rich in gold and suffered multiple structural movements and were formed mainly by replacement are lower The chief ore bodies are dispersed mostly in the negative abnormal of evaporation halo formed in h-values The Carlin-type gold deposits in Guangxi of China are also with such characters The form and type of the decrepitation curve,the height and ratio of the main decrepitation peak,and derived hydrothermal activity frequency coefficient( Pc ) and intensity coefficient ( Qd ) an all be used to predict mineral deposits Some veins have been found based on the above-mentioned informations in the forecast area

利用α┐β峰等信息判断金矿脉的剥蚀程度及找矿①(摘要)李存有施立达(地矿部沈阳地质矿产研究所)采用改进的热声爆裂仪,测试河北省某金矿的石英,从中发掘出多种成矿找矿信息,主要有:1.石英加热到573℃时,α石英转变成β石英,部分样品出现α-β峰,该峰的...

In decrepitation test for quartz,α β peaks frequently appear when the samples are heated to the temperature of 573℃.Study shows that the α β peak is produced by the leaking(without decrepitating) of high temperature inclusions whose decrepitating temperature is higher than 573℃,the critical point when α quartz converts into β quartz This form of peak may be used to infer the denuded degree of lodes and decide the origin of deposits in gold ore exploring

石英在爆裂法测试中常出现α-β峰,此峰是由爆裂温度大于573℃的高温流体包裹体,在α石英相变成β石英时,包裹体发生泄漏(非爆裂)形成的.在金矿地质找矿中,用α-β峰可判断矿脉的剥蚀程度,推测矿床成因

The content and crystal form of pyrites, and sulfur isotopic composition of pyritic sulfur as well as its vertical distribution in the strata near the Permian-Triassic boundary in Meishan, Changxing County, Zhejiang Province, China were studied using theories and methods of geology, petrology, mineralogy and isotopic geochemistry. It is pointed out that the genesis of mass pyrites in the top Permian limestone bed may be correlated with volcanism. Research result indicates that the limestone bed (bed 24e_2, closely...

The content and crystal form of pyrites, and sulfur isotopic composition of pyritic sulfur as well as its vertical distribution in the strata near the Permian-Triassic boundary in Meishan, Changxing County, Zhejiang Province, China were studied using theories and methods of geology, petrology, mineralogy and isotopic geochemistry. It is pointed out that the genesis of mass pyrites in the top Permian limestone bed may be correlated with volcanism. Research result indicates that the limestone bed (bed 24e_2, closely adjacent to the P/T boundary) has the highest pyritic content (1.84%), which is 90 times the content of other beds (bed 22 to bed 24d) far away from the P/T boundary. It has an abnormally high δ 34S value of +2.2‰, which is very similar to the average value of volcanic gas, but is completely different from the value of bacteria reduced pyrites. Furthermore, there are many volcanic products such as β-quartz and siliceous cylinder and siliceous spherules in bed 24e_2, and the contents of trace elements in pyrites and limestone are anomalously high in bed 24e_2 and bed 24f. So, the geological event causing the massive extinction may be volcanism, and submarine volcanic eruption with mass H_2S gas production led to the enrichment of mass H_2S at the ocean surface in the end-Permian.

运用地质学、矿物学、岩石学和地球化学等理论和方法,系统地研究了中国浙江长兴煤山二叠系—三叠系(P/T)界线附近黄铁矿的含量变化、矿物学特征、硫同位素组成及其垂向变化规律等,指出P/T界线附近黄铁矿高含量层位的成因与火山作用有关。研究发现,在浙江煤山长兴组顶部,紧靠P/T界线的第24e2分层石灰岩中,黄铁矿骤然增多,含量高达1.84%,比远离P/T界线的第22至24d分层石灰岩中的黄铁矿含量高出90多倍;硫同位素组成发生突变,δ34S值陡然上升为+2.2‰;其特征与火山气体总硫的同位素组成平均值极为相似,而与细菌还原黄铁矿的硫同位素组成完全不同。而且,在第24e2分层黄铁矿高含量层位中,还共生有较多β-石英等火山碎屑物质;岩石和黄铁矿中微量元素含量异常富集。因此认为,陆地和海底火山活动曾喷出大量的富含H2S的气体,造成古海洋局部最上层海水中富集大量硫化氢,为形成黄铁矿创造了条件。二叠纪、三叠纪之交,强烈的火山作用,使海洋生存环境急剧恶化,是造成海洋生物相继灭绝的主要原因。

 
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