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the mantle
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  地幔
     The calcite of uranium deposit has δ 13C values of -8.5 ~ -3.1‰, which coincides with the mantle δ 13C values (-5±2‰).
     矿床中方解石δ~(13)C值为-8.5~-3.1‰,相似于地幔值(-5±2‰);
     3He/4He values of the dyke rocks are from 2.03×10-7 ~ 7.1×10-7, which are obviously bigger than the 3He/4He value that is formed by radioactivity, and much smaller than the 3He/4He value of the mantle.
     测得辉绿岩3He/4He值为2.03×10-7~7.1×10-7,明显大于放射性成因的3He/4He值,远远小于地幔的3He/4He值.
短句来源
     The calcite of uranium deposit has δ 13C values of -8.5~-3.1‰, which coincides with the mantle δ 13C values (-5±2‰).
     矿床中方解石δ13C值为-8.5‰~-3.1‰,相似于地幔值((-5±2)‰);
短句来源
     The calcite δ~ 13 C of -8.3‰ suggests that the ∑CO-2 in the fluids came from the mantle.
     方解石的δ13C=-8.3‰,表明矿化剂∑CO2也来自地幔
短句来源
     The ( ̄(143)Nd/ ̄(144)Nd)_i= 0.509198±0.000014 and eε_(Nd)(T)= 2.91 ±0.23. It shows that the mantle was depleted and the depleted degree was higher than that of the Dengfeng Group developed at the basement of Taihua Group and contaminated by it.
     其初始值为(~(143)Nd/~(144)Nd)i=0.509198±0.000014ε_(Nd)(T)=2.91±0.23,表明当时地幔是亏损的,亏损程度高于晚期登封群;
短句来源
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  了地幔
     (5)The seismic tomography data show that there are layer convective cells in somewhere ofthe mantle. It infers the complexity and diversification of the structure of the mantle convection.
     (5)地幔局部地区层状相互耦合的对流结构在地震层析剖面上有明显的显示,它表明了地幔对流结构的复杂性,仅管我们对此相知甚少,但它或许是无法避免的;
短句来源
     In termsof the above principle and the geochemical character of La, Ce,Sc,Yb durins mantle--magma processes, the paper also discusses the mantle components of primary masma of Emeishan Basalts and theirchanges, and calculates the mineral composition and the degree of the partial melting of the mantle.
     根据La,Ce和Sc,Yb在地幔-岩浆过程中地球化学特征,运用上述原理,讨论了峨眉山玄武岩系母岩浆的地幔成分及其变化,计算了地幔矿物相组成和部分熔融度。
短句来源
     The discovery reveals a new site for the mantle derived water.
     这一发现 ,揭示了地幔水可以以流体包裹体的形式赋存在火山岩的矿物斑晶中
短句来源
     Basalts from several sections of the Lancangiiang and Jinshajiang suture zones close to mantle plumes supposed by Hou et al (1996) have been investigated to understand the influence of the mantle plume on the geochemistry of MORBs and on the evolution of the Paleo-Tethyan lithosphere in Sanjiang, China.
     本文通过研究三江地区金沙江和澜沧江缝合带MORBs的时空分布配置、岩石组合类型、岩石地球化学及区域地化异常,揭示了地幔热柱对古特提斯岩石圈内MORBs源岩及MORBs的化学成分影响,讨论了地幔热柱对古特提斯洋开启的驱动机制及对岩石圈演化的制约作用。
短句来源
     The basalt eruption suggests that the fault zone reached deeply into the upper mantle and caused the mantle shear zone,and shows important deep process information such as mantle metasomatism and mixed mantle regions.
     该玄武岩喷发不但反映了断裂带已深切至上地幔 ,出现了地幔剪切带 ,也显示地幔交代、混杂地幔区等重要的深部过程信息。
短句来源
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  “the mantle”译为未确定词的双语例句
     But the best growth conditions of the mantle cells are that the concentration of Ca~(2+) is 1g/L,Mg~(2+) 1g/L and Zn~(2+) 60μg/L.
     对外套膜细胞生长最好的组合为1 g/L的Ca2+,1 g/L的Mg2+,60μg/L的Zn2+.
短句来源
     40Ar/36Ar 426~ 2 073; the average of 40Ar is 8.20× 10- 7 cm3/g, and the average of 4He/40Ar is 2.17. 3He and 4He are close to the mantle area on the discrimination diagram.
     40Ar/36Ar=426~2073,40Ar平均为8.20×10-7cm3/g,4He/40Ar平均为2.17。
短句来源
     The isotopic researches of CO 2 and rare gases show that δ ( 13 C CO2 ) ranges from -8.30‰ to -3.41‰,with He concentration more than 1% and φ ( 3He)/ φ ( 4He) varying from 4.45×10 -6 to 4.49×10 -6 ,indicating the mantle derived magma origin.
     对气田中 CO2 气体和稀有气体的同位素研究表明 ,δ(13 CCO2 )为 -8.3 0‰~ -3 .41‰ ,φ(He)大于 1% ,φ(3 He) /φ(4He)在 4.45× 10 -6~ 4.49× 10 -6间 ,证明其为岩浆—幔源成因 ;
短句来源
     The relationship between the mantle length and body weight is w = 1 . 8592 × 10- × L2.2020(correlation coefficient r = 0.9979) and the sex ratio of female to male is 1 to 1 .26. Sexual maturity is one year, and the squid die after spawning.
     胴长与体重的关系为:W=1.8592×10~(-3)×L~(2.2020)(相关系数r=0.9979),雌雄性比为1:1.26,一年性成熟,产卵后亲体相继死去。
短句来源
     The dominant mantle length of jumbo flying squid ranges from 24 to 48cm. The relationship between the mantle length and weight is Y = 6 × 10-6L3.2598(R2 = 0.9924) .
     茎柔鱼的优势胴长为24~48cm,胴长和体重的关系为:Y=6×10~(-6)L~(3.2598)(R~2=0.9924);
短句来源
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  the mantle
The mantle upwelling originates from the core-mantle boundary and mostly occurs in the middle mantle and the lower part of the upper mantle.
      
The mantle flow has an effect on controlling the movement of plates and the distributions of ocean ridges, subduction zones and collision zones.
      
The mantle upwelling regions are clearly related with the locations of hotspots on the earth's surface.
      
As the volcanism prograded to the northwest, the depth of fault penetration into the mantle changed.
      
In Peter the Great Bay, Sea of Japan, this species repeatedly reproduces during the entire spring-autumn period; externae with developing embryos in the mantle cavity occur from May to September, and planktonic larvae occur from June to October.
      
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An electromagnetic model of the reversal of the geomagnetic field, based on Bullard-Parker's dynamo theory of the origin of the main geomagnetic field is described. It is shown that a reversal of the geomagnetic field may arise in that case when the toroidal field in the earth's interior turns itself into the opposite direction. The authors further show that if a large enough "sudden fluctuation" is given to the earth's rotation by whatever means, then the electromagnetic interaction between the core and the...

An electromagnetic model of the reversal of the geomagnetic field, based on Bullard-Parker's dynamo theory of the origin of the main geomagnetic field is described. It is shown that a reversal of the geomagnetic field may arise in that case when the toroidal field in the earth's interior turns itself into the opposite direction. The authors further show that if a large enough "sudden fluctuation" is given to the earth's rotation by whatever means, then the electromagnetic interaction between the core and the mantle may give rise to a reversal of the toroidal field and consequently a reversal of the geomagnetic field. The calculation indicated that the "sudden fluctuation", which should be a decrease of the period of the Earth's rotation, is large enough only when its order of magnitude is greater than 10~2 ms. At the end of the work the time interval of each reversal is discussed. It is shown that each reversal can last 10~3—10~6 years.

本文是根据地球基本磁場起源的“发电机”理论而提出的地磁場倒转的电磁模型,认为地磁場的倒转是地核内部“环型”場反向的结果,若地球转速的“突然”扰动够大,则地幔与地核之间的电磁作用可以引起地球内部“环型”場的反向,从而实现地磁場的倒转,计算表明,这一扰动的性质是地球蒋动周期的减小,其数量级为10~2毫秒。文章的末尾计论了反向地磁場的维持问题,得出倒转磁場维持的时间间隔约为10~3年—10~6年。

In order to facilitate the investigation of plate tectonic on the continent, the writer proposes some principles for references. They are: 1, the juncture between two plates is always represented by a great fault or fracture zone extending for at least several hundreds or usually more than one thousand kilometers long; 2, the sharp diversities of depositional phases and faunas on the adjacent plates; 3, the presence of melanges; 4, the presence of ophiolite zone; 5, the presence of blueschists; 6, the dis-tribution...

In order to facilitate the investigation of plate tectonic on the continent, the writer proposes some principles for references. They are: 1, the juncture between two plates is always represented by a great fault or fracture zone extending for at least several hundreds or usually more than one thousand kilometers long; 2, the sharp diversities of depositional phases and faunas on the adjacent plates; 3, the presence of melanges; 4, the presence of ophiolite zone; 5, the presence of blueschists; 6, the dis-tribution with some regularities of intrusive and extrusive rocks; 7, the distribution of earthquake epicenters; and 8, the unequal polar wanderings of adjacent plates.Judging from the above mentioned principles and examining the geological features of China, we find that, some mountain ranges and territories may be considered as junctures of plate tectonics, those are: 1, the Tsinling structural zone, 2, the eastern coast of Taiwan, 3, the Yalutsangpo Eiver in Tibet, 4, the upper stream of Jinsha River, 5, the Lungmen Mountain and "Kangdian axis" and 6, the northern rim of Chilien Mountain.There are some questions, which need to be further studied. 1, The hypothesis of collision of two continents seems to require certain modifications, because almost all of the subduction zones occur along one or both sides of the geosyncline, and two con-tinents do not come to contact directly with each other. It is fairly the same as along the continental margin, where the oceanic plate moves against the continental plate. 2, Can the ultrabasic rocks intrude into continental crust, or can they only be gene-rated in the mantle? 3, If the ultrabasic rocks appear only in the geosyncline, is it possible to say, that the old massifs, in which ultrabasic rocks are present, such as the Taihwa group of Shensi and the Hwaiyang Shield of Dabie Mountain are geosynclinal metamorphic rocks instead of igneous origin? 4, In northwestern Pacific all of the is-land arcs are with the convex side opposite to the underthrusting plate. Is it possible to be considered as a rule to judge that, which side is the undergoing plate ? It is true, that the subduetion zones on the continent and even along the line between Pacific and South America are not in arc form. 5, According to Dickinson, Mitchell and Eeading there is a gap between the trench and volcanic arcs. In China, so far we know, the intrusive bodies are always directly in contact with the subduction zone, with only the Taiwan Strait as an exception. 6, Sometimes there are granite or granodiorite intrusions to be found behind the subduction zone. Is there another subduction zone behind the former one, or were there igneous activities during the folding of geosyn-cline as indicated .by the classical geotectonic theory ? 7, Except in the eastern provinces of China, where the volcanic rocks are wide-spread, in central and western China very rare volcanic rocks have been found along the margin of overriding plate. Whether the volcanic rocks were eroded away on the magma did not rise to the earth surface at all, is still a question.

为便于在大陆上研究板块构造,作者提出了几项原则,作为参考:1.板块接触带时常表现为一条大断层或断裂带,延伸至少数百公里,经常超过一千公里;2.在两个相邻的板块上,沉积岩相和古生物群有显著的划分;3.有混杂堆积的出现;4.有蛇绿岩带的出现;5.有蓝片岩的出现;6.侵入岩与喷出岩具有规律性的分布;7.地震震中的分布;8.两个相邻板块所指极向的不同移动轨迹. 根据上述原则,结合中国地质情况进行分析,作者认为我国有几条山脉和地区可能是板块构造接触带.这些是:1.秦岭东西构造带,2.台湾省东岸,3.西藏的雅鲁藏布江,4.金沙江上游,5.龙门山及“康滇地轴”,6.祁连山北部边缘. 在工作中也遇到了以下几个有待进一步研究的问题:1.大陆板块对大陆板块互相碰撞的说法,似应作一定的修改.因为几乎所有大陆上的俯冲带都是沿着地槽的一边或两边发生的,而不是两个大陆板块直接相互接触.它和大陆边缘的海洋板块对大陆板块的移动,极为相似。2.超基性岩是否能侵入到大陆地壳,还是只能生成于地幔?3.如果说超基性岩只出现于地槽,则古老地块中有超基性岩出现时,是否可以说,这是以前地槽沉积的变质岩,而不是古老的岩浆岩体,例如秦岭的大华群和大别山的淮阳...

为便于在大陆上研究板块构造,作者提出了几项原则,作为参考:1.板块接触带时常表现为一条大断层或断裂带,延伸至少数百公里,经常超过一千公里;2.在两个相邻的板块上,沉积岩相和古生物群有显著的划分;3.有混杂堆积的出现;4.有蛇绿岩带的出现;5.有蓝片岩的出现;6.侵入岩与喷出岩具有规律性的分布;7.地震震中的分布;8.两个相邻板块所指极向的不同移动轨迹. 根据上述原则,结合中国地质情况进行分析,作者认为我国有几条山脉和地区可能是板块构造接触带.这些是:1.秦岭东西构造带,2.台湾省东岸,3.西藏的雅鲁藏布江,4.金沙江上游,5.龙门山及“康滇地轴”,6.祁连山北部边缘. 在工作中也遇到了以下几个有待进一步研究的问题:1.大陆板块对大陆板块互相碰撞的说法,似应作一定的修改.因为几乎所有大陆上的俯冲带都是沿着地槽的一边或两边发生的,而不是两个大陆板块直接相互接触.它和大陆边缘的海洋板块对大陆板块的移动,极为相似。2.超基性岩是否能侵入到大陆地壳,还是只能生成于地幔?3.如果说超基性岩只出现于地槽,则古老地块中有超基性岩出现时,是否可以说,这是以前地槽沉积的变质岩,而不是古老的岩浆岩体,例如秦岭的大华群和大别山的淮阳地盾等。4.在太平洋西北部的岛弧,都是弧形凸侧向着俯冲带.这是否可以认为是辨

In this paper results are presented for the investigation of the deep crustal structure of the Beijing-Tianjin-Tangshan-Zhangjiakou region, using the data obtained in and around Beijing during 1971-1975 from 8 industrial explosions and several earthquakes which occurred in this region. Data of 58 observation points for industrial explosions and 54 observation points for earthquakes were used in the com-putation. A three-layer model of the crust was obtained for this region.The average crustal thicknesses of...

In this paper results are presented for the investigation of the deep crustal structure of the Beijing-Tianjin-Tangshan-Zhangjiakou region, using the data obtained in and around Beijing during 1971-1975 from 8 industrial explosions and several earthquakes which occurred in this region. Data of 58 observation points for industrial explosions and 54 observation points for earthquakes were used in the com-putation. A three-layer model of the crust was obtained for this region.The average crustal thicknesses of different portions of the region are not the same. In Beijing and the area Southeast of it, the thickness of the crust amounts to 35 ± 1.5km, while north of Beijing, it is 37 ± 1.5km, and west of Beijing, it is 39±1.5km. The average velocities of the compressional and transversal waves are respectively 6.23 ± 0.03 km/s, and 3.55 ± 0.05 km/s, and they are 7.98 ± 0.13 km/s and 4.60 ± 0.03 km/s for the uppermost part of the mantle.

本文主要叙述利用近年来北京及其附近地区八次工业爆破的观测资料,同时也利用了一部份天然地震的资料来研究北京—天津—唐山—张家口地区地壳结构的结果,采用了工业爆破中的58个观测点和天然地震的54个观测点的数据,得到了本区的三层地壳模型和地壳厚度。 地壳的平均厚度分布各地区不很一致;北京及其东南地区为35±1.5公里,北部地区为37±1.0公里,西部地区为39±1.5公里,地壳介质中的纵波和横波的平均速度分别为6.23±0.03公里/秒和3.55±0.05公里/秒,上地幔顶部介质的平均速度为7.98±0.13公里/秒和4.60±0.03公里/秒。

 
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