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化石冰
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     THE DISCOVERY OF THE QUATERNARY FOSSIL ICE-WEDGES IN CHENGDU PLAIN
     成都平原第四纪化石冰楔的发现及古气候意义
短句来源
     Recently,four fossil ice-wedges have been found at the outcrop excavated,at the north end of the Plio-Pleistocene Dayi Conglomerate Profile on the west bank of the Xiejiang River near Dayi Nitrogenous Fertilizer Factory,west of the Chengdu Plain.
     最近 ,在成都平原西缘 ,大邑城西氮肥厂附近 ,斜江河西岸 ,上新统—下更新统大邑砾岩剖面的北端新开挖的露头上 ,发现了 4条化石冰楔。
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  相似匹配句对
     Ice
    
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     Ice Thermo Storage
     蓄能
短句来源
     THE DISCOVERY OF THE QUATERNARY FOSSIL ICE-WEDGES IN CHENGDU PLAIN
     成都平原第四纪化石楔的发现及古气候意义
短句来源
     THE METHOD OF RECONSTRUTION OF FOSSILS
     化石复制方法
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     Talk about fossil energy
     漫谈化石能源
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  fossil ice
There is a national park project linked with nature reserves comprising picturesque landscapes, a rare flora and fauna and distinct geological and palaeotological formations (including fossil ice).
      
Fossil ice wedges are recognizable by a secondary infilling of sand or gravel known as ice wedge casts.
      
Isolation of nucleic acids and cultures from fossil ice and permafrost.
      
In sections studied in the Tver, Vologda, and southern Arkhangelsk areas cover sands with fossil ice-wedge casts were frequently encountered.
      
The fossil ice wedges are larger in the Vaga valley area than in the more southern sites in Tver and Vologda.
      


Recently,four fossil ice-wedges have been found at the outcrop excavated,at the north end of the Plio-Pleistocene Dayi Conglomerate Profile on the west bank of the Xiejiang River near Dayi Nitrogenous Fertilizer Factory,west of the Chengdu Plain.Its co-ordinates are 30°35′N,103°31′E,and 530m above sea level. These ice-wedges have been developed on the top of the outcrop of Dayi Conglomerate.The largest wedge is 3m wide at the top,and extends 2 5m vertically.The wedges extend vertically downwards,and obliquely...

Recently,four fossil ice-wedges have been found at the outcrop excavated,at the north end of the Plio-Pleistocene Dayi Conglomerate Profile on the west bank of the Xiejiang River near Dayi Nitrogenous Fertilizer Factory,west of the Chengdu Plain.Its co-ordinates are 30°35′N,103°31′E,and 530m above sea level. These ice-wedges have been developed on the top of the outcrop of Dayi Conglomerate.The largest wedge is 3m wide at the top,and extends 2 5m vertically.The wedges extend vertically downwards,and obliquely intersect the bedding planes of the Dayi Conglomerate.They thus postdate deposition of the Dayi Conglomerate and appear to be epigenetic.The sediments in the ice-wedges are different from the Dayi Conglomerate.The former are brownish yellow,well-sorted,with 5cm~15cm clasts in a fine-grained matrix.The latter is grey-white or yellow-grey,poorly-sorted,with 20cm~30cm clasts.The ice-wedge sediments have a higher percentage of gravel(95%) compared to the Dayi Conglomerate(85%).In addition,the distribution of ab planes for pebbles in the ice-wedge sediments is random,whereas ab planes in the Dayi Conglomerate are dominantly orientated 170°~210°∠30°~40°.According to these differences,the ice-wedges can be distinguished from outcrops of the Dayi Conglomerate.The age of sediments in the ice-wedges is 0\^171 Ma from ESR data.This suggests that these ice wedges might correspond to stage 6(0\^195Ma~0 128Ma)of the oxygen isotope temperature curve from deep sea-core V28-238.This is similar to the climatic fluctuations recorded by L 2~5 (0 195Ma~0 180Ma)and L 2~4(0 180Ma~0 167Ma)of Chinese loess,and the penultimate glacial stage in Qinghai-Xizang Plateau.It is generally considered that ice-wedges are indicative of permafrost,therefore the samples we obtained suggest that permafrost developed in the Chengdu Plain during the Pleistocene. It has been reported that permafrost can only develop below -6℃ in high-latitude areas,and the southernmost extent of permafrost occurrence is equivalent to the -2℃ to -4℃ isotherm.However,the annual air temperature in Dayi is about 16℃ now,which means the temperature during ice wedges formation may have been at least 18℃ less than present.

最近 ,在成都平原西缘 ,大邑城西氮肥厂附近 ,斜江河西岸 ,上新统—下更新统大邑砾岩剖面的北端新开挖的露头上 ,发现了 4条化石冰楔。这里的地理坐标是 30°35′N1 0 3°31′E ,海拔 530m。这些冰楔发育于大邑砾岩露头的顶部。其中最大的一条 ,顶部宽 3m ,向下延伸 2 5m。这些冰楔垂直向下延伸 ,与大邑砾岩层面斜交。所以 ,它们是在大邑砾岩沉积之后并经过构造变动后形成的 ,是大邑砾岩的后生冰楔。化石冰楔的充填物的特征与大邑砾岩有明显差别 :前者为棕黄色 ,后者为灰白—黄色 ;前者砾径分选较好 ,砾径较细 ,一般长 5cm~ 1 5cm ,而后者砾径分选较差 ,粗大者 2 0cm~ 30cm ;前者的砾石含量高 ,约 95% ,后者的砾石含量低 ,约 85% ;前者砾石ab面产状无优势方向 ,而后者的ab面产状显示优势方向 ,倾向1 70°~ 2 1 0°,倾角 30°~ 40°。由于两者有上述差别 ,所以 ,化石冰楔在露头上可以被识别出来。采用ESR法测定冰楔充填物的时代为 0 1 71Ma。由此看来 ,这些冰楔的形成时代可能相当于V2 8- 2 ...

最近 ,在成都平原西缘 ,大邑城西氮肥厂附近 ,斜江河西岸 ,上新统—下更新统大邑砾岩剖面的北端新开挖的露头上 ,发现了 4条化石冰楔。这里的地理坐标是 30°35′N1 0 3°31′E ,海拔 530m。这些冰楔发育于大邑砾岩露头的顶部。其中最大的一条 ,顶部宽 3m ,向下延伸 2 5m。这些冰楔垂直向下延伸 ,与大邑砾岩层面斜交。所以 ,它们是在大邑砾岩沉积之后并经过构造变动后形成的 ,是大邑砾岩的后生冰楔。化石冰楔的充填物的特征与大邑砾岩有明显差别 :前者为棕黄色 ,后者为灰白—黄色 ;前者砾径分选较好 ,砾径较细 ,一般长 5cm~ 1 5cm ,而后者砾径分选较差 ,粗大者 2 0cm~ 30cm ;前者的砾石含量高 ,约 95% ,后者的砾石含量低 ,约 85% ;前者砾石ab面产状无优势方向 ,而后者的ab面产状显示优势方向 ,倾向1 70°~ 2 1 0°,倾角 30°~ 40°。由于两者有上述差别 ,所以 ,化石冰楔在露头上可以被识别出来。采用ESR法测定冰楔充填物的时代为 0 1 71Ma。由此看来 ,这些冰楔的形成时代可能相当于V2 8- 2 38深海岩心氧同位素曲线第 6气候期 ( 0 1 95Ma~0 1 2 8Ma) ,也可与中国黄土L2~ 5( 0 1 95Ma~ 0 1 80Ma)和L2~ 4 ( 0 1 80Ma~0 1 6 7Ma)所记录的气候波动和青藏高原倒数第二次冰期对比。一般认为 ,

 
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