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record of environment
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    Loess Record of Environment Changes in Upper Reaches of Weihe River since Last Interglacial
    末次间冰期以来渭河上游气候演化的黄土记录研究
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  record of environment
Video provides a comprehensive visual record of environment activity over time.
      


Ancient environment rebuilding is a very trouble problem for many years. After studying the standard debris flow deposit in different area,the relationship between the different facies,facies associations, sedimentary feature of section, vertical and cross section,and depositional environment is discussed in this paper.Debris flow deposit can be separated into A,B,C,D,and A' 5 different facics. The facies of A,B,D,A1 represent the period of debris flow deposit.and the C facies stand for times of depositional...

Ancient environment rebuilding is a very trouble problem for many years. After studying the standard debris flow deposit in different area,the relationship between the different facies,facies associations, sedimentary feature of section, vertical and cross section,and depositional environment is discussed in this paper.Debris flow deposit can be separated into A,B,C,D,and A' 5 different facics. The facies of A,B,D,A1 represent the period of debris flow deposit.and the C facies stand for times of depositional interruption. Research on B facies should be given more attention in the fieid, which also can give the information about time of the depositional interruption according to whether it contain the fossil of aninalsand plants. Different facies associations reflect the depositional features of debris flow in different environment. From southwest to northeast in China the C facies increases in facies associations gradually.This represents that frequency of debris .flow activity decreases and the climate changes from wet-hot to dry-cold.Sedimentary section of debris flow reflects quite the paleoclimatic.change.At .period of debris flow deposit during late Pleistocene, the climate had three middle scale changes in Wudu Region, Gansu Province. The comprehensive records of environment change which showed by cross and vertical section of debris flow are different. The vertical section can give more information about sedimentary environment. The change of thickness in section records the change of debris flow supplying quantity and accumulate quantity in material source area. The deposit and interrupt of debris flow respect the climatic change in the region, they are the record of environment change.

甘肃武都地区及陕西某些地区典型泥石流沉积剖面,可分为A,B,C,D,A′5种相。不同的相组合,剖面沉积特征及纵、横剖面等,都从不同的角度较好地记录了环境变化。

Luochuan section is located in Shaanxi province, at the central of Chinese Loess Plateau. Sandy shale and sand stone at Triassic is the bottom of gully. Red clay of Late Pliocene about 15m thick overlies the bedrock. The loess layer is 130m thick, and overlies red clay. Some reliable polarity columns for the Luochuan section has been derived in order to determine the important polarity boundaries and the age of loess layer exactly. M/G boundary lies at the Wucheng Loess /Red Clay boundary, Olduvai subchron...

Luochuan section is located in Shaanxi province, at the central of Chinese Loess Plateau. Sandy shale and sand stone at Triassic is the bottom of gully. Red clay of Late Pliocene about 15m thick overlies the bedrock. The loess layer is 130m thick, and overlies red clay. Some reliable polarity columns for the Luochuan section has been derived in order to determine the important polarity boundaries and the age of loess layer exactly. M/G boundary lies at the Wucheng Loess /Red Clay boundary, Olduvai subchron is recorded at the middle-upper portion of Wucheng, Jaramillo subchron and B/M boundary lies in Lower Lishi loess. Other methods such as 14C and thermoluminescent can date Malan and S 0, and time scales established respectively by Liu, Ding, Lu and Kukla have showed the age of each loess layer. Loess-paleosol sequences in Luochuan China provide a detailed record of environment changes during the last 2.5million years. The histories of flora, fauna and climate could be observed by means of some proxies such as susceptibility, granularity, snail species, sporopollen, phytolith, CaCO 3, stable isotope, trace element, amino acid, and so forth. Investigation of them display that the long-term changes represented by Luochuan Loess-paleosol sequences have borne a multi-cycled feature with repeated climatic fluctuations from warm-humid to dry-cold. Before Olduvai subchron, some kinds of large mammals included Eucienoceros?Ursus sp.?Lynxshansius inhabited Luochuan basin; but after this, most of them disappeared except lagomorph and rodent. In this sequence from the bottom upwards, the content of Ca?Sr and Fe 2+ tends to increase; on the contrary, Al?K?Ti?Mn and Fe 3+ decreases; acidic amino acids are present in relatively greater amounts than alkaline amino acids; and CaCO 3 becomes more and more abundant. All of the facts imply that the depositional environment of Luochuan section has a bias to an alkaline and reductive thing. On the whole, the climate of Luochuan is becoming drier and colder. The grain size distribution, magnetic susceptibility, the ratios of Rb/Sr, Mg/Al,Mn 2+ and δ 13C in Luochuan sequence exhibits multi-cycled climatic changes as regular fluctuation. These are also evidenced by alternations of different types of loess and paleosol. The climate curve of Luochuan can also be correlated with the results of Pacific Ocean deep-sea cores' studies. S 0 is comparable to oxygen isotope stage 1, Loess L 1 correlates with stage 2,3,and 4, and paleosol S 1 correlates with stage 5. Loess and paleosol means the term for glaciation and interglaciation respectively. The grain size distribution represents a proxy climate index on winter monsoon of Asia; and then, magnetic susceptibility, the ratios of Rb/Sr, Mg/Al and Mn 2+ are indexes related to past changes of precipitation and vegatation, and thus to summer monsoon. Luochuan profile has offered many data about winter or summer monsoon at central Loess Plateau. Soils were forming during intervals of strong summer monsoon, whereas loess units were deposited at times of reduced monsoon intensity.In fact, the Chinese loess-paleosol can be view as a proxy record of Asian monsoon variability extending over the last 2.5 Ma. It is pretty helpful at the study on monsoon in East Asia. Mollusk and phytoliths in Malan loess and S 0 record the paleovegetation since the last interglaciation. Spore and pollen reveals the history of flora. All of the data about biota indicate that an adverse steppe with a dry-cold climate and a more dense forest and steppe vegetation with a temperate and moist climate existed alternately.δ 13C in organic matter demonstrates such conclusion, too. Comparison of mollusk records from the Luochuan loess sequence with those of grain-size and aridity index from RC 27-61 core in the India ocean reveals obvious similarities in several time intervals, suggesting that climate variations in the Loess Plateau may have been also subjected to the Indian monsoon to a certain extent in the geological past. The presence of som

洛川黄土—古土壤序列记录了最近 2 .5Ma黄土高原自然环境的演化和变迁。国内外研究人员运用地层学、古生物学、土壤学、磁学、沉积学、岩石学、矿物学、地球化学等多学科的研究方法 ,统一地层划分 ,明确成因机制 ,建立时间标尺 ,分析气候指标 ,提取环境信息 ,逐步揭示了自早更新世以来该区气候由暖湿而冷干、频繁剧烈波动的历史以及古生物的演替过程 ,为全球变化研究提供了重要资料。

 
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