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rapid sedimentary
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  快速沉积
     The vertical illite crystallinity variation remarkably divides into two stages, just consistent with the first and second episodes during the elevation stage of Himalayan movement, which reflects the rapid sedimentary characteristics of continuous uplift and denudation of orogenic belt.
     伊利石的结晶度由下向上变好,纵向上变化的两个明显台阶正好与喜马拉雅造山运动抬升的第Ⅰ、Ⅱ幕时期相一致,反映了造山带不断抬升剥蚀的快速沉积特征。
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  相似匹配句对
     Rapid dacryocystorhinostomy.
     快速泪囊鼻腔吻合术
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     With the rapid development of the
     愿本文能为《公司法》的修改稍尽微薄之力。
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     sedimentary conditions.
     在沉积上、构造上有独特之处。
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     RAPID CLIMATE CHANGE AND HIGH RESOLUTION DEEP-SEA SEDIMENTARY RECORDS
     快速气候变化与高分辨率的深海沉积记录
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     The Cretaceous Sedimentary Environments of Changtu Sag and Its Implications for the Rapid Uplifting of Yan Liao Orogen
     昌图凹陷白垩纪沉积环境对燕辽造山带隆升过程的指示
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The Palaeo-Yangtze River had already been as nearly large as its present scale in the end of Late Pliocene. During the early period of Early Pleistocene (after Olduvai subchron), when a low sea level remained for a longer term in the Yellow Sea Shelf area, in the central part of the sea were formed thicker fluvilly deposited sediments, which provided the oldest evidence ever revealed for the traces of Quaternary Palaeo-Yangtze River in the South Yellow Sea. In consequence of marine transgression proceeding towards...

The Palaeo-Yangtze River had already been as nearly large as its present scale in the end of Late Pliocene. During the early period of Early Pleistocene (after Olduvai subchron), when a low sea level remained for a longer term in the Yellow Sea Shelf area, in the central part of the sea were formed thicker fluvilly deposited sediments, which provided the oldest evidence ever revealed for the traces of Quaternary Palaeo-Yangtze River in the South Yellow Sea. In consequence of marine transgression proceeding towards Eastern China Shelves during the late period of Early Pleistocene (from the beginning of Jaramillo subchron to the end of Matuyama Chron), the delta deposition with thicker sediments occurred geographically in the centre of the sea. The early Early Pleistocene fluvial sediments are covered by the transgressive delta of late Early Pleistocene. The interval 79.82-91.33m from Borehole QC2 collected on the South Yellow Sea Shelf, located at 122°16'E and 34°18'N and under a water depth of 49.05m, records this palaeo-deltaic sedimentary sequence. Overlain by fluvial deposits, the sequence can be easily recognized to consist of 4 beds labelled with letters a,b,c and d from bottom to top: The bed d, belonging to interdistributary bay sediments, comprises silty clay interbedded with laminated silt and lag deposits in bottom, as well as a great amount of foraminiferas showing monotonic species and very low diversity. The bed c, deposited in distributary riyer mouth bars, is dominated by smallscale, low-angle cross-bedded and, locally, ripple bedded, medium, to fine sands burrowed by livings, not rich in foraminiferas which are of shallow coastal origin and mostly wore off and in low diversity; additionally, there are mollusks analogous to those in modern intertidal zone and fresh water, typical of sea water environment mixing with rivers. The bed b, resulted from distributary channels and containing tabular-cross bedded sands, shows 4 evident upwards-fining sedimentary cycles representing subaqueous fluvial multicycle aggrations from channels to point bar to flood lands, dominant foraminifera Ammonia becarii var. distributing interrupedly in the layer.The bed a, also attributable to the deposition of river mouth bars and seperated from the underlying strata by a erosive surface, is composed of low-angle crossbedded fine sands and silty clay, in which are found 3 turbidite layers generated from rapid sedimentary events. The above-mentioned beds a,b,c and d make up a deltafront sedimentary sequence, indicative of subenvironmental changes from river mouth bars through distributary channels to river mouth bars and finally to distributary bays. The bed a overlies the deposits formed in a branching channel plain, instead of the prodelta sediments as in normal progressive delta sequences. Studies in palaeomagnetism demonstrate that the delta-front deposits are between the base of Jaramillo subchron and the B/M boundary, representing a span of 0.24 Ma (from 0.97Ma B. P.-0.73 Ma B.P.). Study of the grain size characteristics is helpful to recognizing the Yangtze River Delta. The sediments of river mouth bars are similar in grain size, with mean grain size of 2.5-4.4φb, poorly or middlingly sorted,and positively skewed; the probability curve is characterized by two saltation subpopulations, both intersecting between 2.25-2.8φ, which may be interpreted as scouring/reflucence bountary point, an important mark indicating bimodel currents reworking of sediments and representing bidirectional interaction among rivers, tidal currents and wave in the river mouth area. A high content of suspended load in the river mouth bars points to the character of distal river mouth bars. The distributary channel subfacies also shows two saltation subpopulations in the probability curve, because it was near the river mouths and frequently affected by tidal currents. The interdistributary bay deposits are dominated by suspeded load,intercalated with a number of silty laminations due to disturbance of waves and shore currents. From the content and

早更新世晚期(加拉米洛亚时开始到松山时结束),中国东部陆架发生海侵。随着海侵的推进,在南黄海中部出现了较厚的三角洲沉积。在沉积层的垂直序列上,发现了分流河口沙坝、分流河道和分流河口间湾等三角洲前缘沉积亚相的交替。这是一个海侵序列的三角洲层序。在海侵进程中三角洲的进积速率与海水进侵速率基本平衡。南黄海晚松山时古长江三角洲的发现,从一个侧面证明了浙闽隆起带在早期第四纪仍然是继承晚第三纪的一个构造上的隆起及地貌上的屏障,它制约着古长江流向东北方向。

The Tertiary in Tarim basin is in the early diagenesis stage. The illite crystallinity in Tertiary mudstone remains the same as the anchi metamorphic source rock in orogenic belt in the periphery, and becomes better from bottom to top. The vertical illite crystallinity variation remarkably divides into two stages, just consistent with the first and second episodes during the elevation stage of Himalayan movement, which reflects the rapid sedimentary characteristics of continuous uplift and denudation...

The Tertiary in Tarim basin is in the early diagenesis stage. The illite crystallinity in Tertiary mudstone remains the same as the anchi metamorphic source rock in orogenic belt in the periphery, and becomes better from bottom to top. The vertical illite crystallinity variation remarkably divides into two stages, just consistent with the first and second episodes during the elevation stage of Himalayan movement, which reflects the rapid sedimentary characteristics of continuous uplift and denudation of orogenic belt. It is believed that rapid uplifting, denudation, accumulation, and low diagenetic degree are necessary to allow the structural features of anchi metamorphic illites preserved, and also the most important control on the compositional characteristics of clay mineral in mudstone.

塔里木盆地第三系处于早成岩阶段,泥岩中的伊利石结晶度至今仍保持着盆地周围造山带近变质物源的结构特征。伊利石的结晶度由下向上变好,纵向上变化的两个明显台阶正好与喜马拉雅造山运动抬升的第Ⅰ、Ⅱ幕时期相一致,反映了造山带不断抬升剥蚀的快速沉积特征。研究认为,快速抬升、剥蚀、堆积和低的成岩程度是近变质伊利石的结构特征能够保存的两个必要条件,也是决定泥岩粘土矿物组成特征的最主要因素。

This paper, based on the field investigation with analyzing and studying the grainularity features and quartz's isotope content of the sediments, discusses the effects of transport mechanism, sedimentary environment and material sources of the moraine drift and fluvioglacial sediments for different geological periods, lacustrine sediments and loess from the typical regions of the West Kunlun Mountain, N_2 and Q_1 sediments developed in the perimountain region of the Kunlun Mountain and Kashi Basin, the grain...

This paper, based on the field investigation with analyzing and studying the grainularity features and quartz's isotope content of the sediments, discusses the effects of transport mechanism, sedimentary environment and material sources of the moraine drift and fluvioglacial sediments for different geological periods, lacustrine sediments and loess from the typical regions of the West Kunlun Mountain, N_2 and Q_1 sediments developed in the perimountain region of the Kunlun Mountain and Kashi Basin, the grain parameters and quartz's δ(18)O values. The results show that the sediment features of different times and types have not only the sameness, but also the respective characteristics. The sameness (fine-grained materials) are: whether in the profiles or in the regions, (1) the similar mean granularity and skewness, which reflect the similarity of material sources and sedimentary environment; (2) the poor sorting, because these sediments were not strongly modified by wind and water after they deposited on the other hand, the material composition is fine, so the effect of secondary modification is not remarkable; (3) narrow to medium kurtoses, which reflect they came from the unitary material sources. The sedimentary features are: (1) The materials of moraine drift are from boulder to clay, have double modes because of strong transport force and rapid sedimentary speed, and their oxygen isotopes in different regions vary in a larger range, and are unanimous with their underlying bedrock composition, which shows that the material sources are the local sites; (2) Fluvioglacial and lacustrine sediments, because the transport force was relatively weak and they were developed from the moraine drift, are mainly fine-grained materials, the sorting is also better than the moraine drift from the relevant time; (3) The grain parameters and oxygen isotopes of loess from different regions are unanimous, which indicates that the material sources are homogeneous and external; (4) The difference between N_2 and Q_1 sediments, in macroscopic distribution, microscopic composition as well as oxygen isotopes, shows their distinct material sources, geological forces and sedimentary environment.

本文在野外考察的基础上,结合室内粒度和石英氧同位素含量分析,讨论了西昆仑山典型地区晚新生代不同时期沉积的搬运机制、沉积环境和物质来源对粒度参数和石英δ~(18)值的影响。

 
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