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海退海侵
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     Some problems discussion is: 1. the transgression and regression in Holocene;
     1、全新世海侵海退;
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     Transgressive-Regressive Sequences of the Upper Paleozoic at the Wudang Section in Guiyang
     贵阳乌当上古生界的海侵海退层序
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     THE TRANSGRESSION OF CARBONIFEROUS IN LIAONING
     辽宁石炭纪海侵
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     Transgression of Late Paleozoic Era in Ordos Area
     鄂尔多斯地区晚古生代的海侵
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     HOLOCENE TRANSGRESSIVE-REGRESSIVE SEQUENCE IN YANGTZE DELTA AREA
     全新世长江三角洲地区的海进海退层序
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  marine regression
The fraction of Fe-sulphides increases and becomes the dominant minerals determining the magnetic characteristics in grey-black organic-rich clay horizons, indicating an anoxic, sulphate-reducing swamp environment resulting from a marine regression.
      
During climate cooling and associated marine regression, permafrost aggradation takes place due to the low temperatures and the direct exposure of the shelf to the atmosphere.
      
Additional analysis using subsets of the data or recoding periods of anoxic water as periods of reduced habitable area (in addition to marine regression) also failed to show a significant association.
      
The decrease in S, and the increase in siderite-Fe, can be attributed to decreasing marine influence, as a result of the marine regression at the Pliocene-Pleistocene transition.
      
The second phase of the model, marine regression, can only explain the colonization of the region by the ancestor; the subsequent evolution and speciation at a smaller scale remain to be explained.
      
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The loess along south Liaoning seashore derived from Bohai seabed during the last glacial period when sea level was low was transported and deposited by northwest wind in a short distance. The variations of 2-3 φ content (corase-fine-corase cycle) in the profile indicate the dry and cold-cool and wet-dry and cold palaeoclimate changes and the regres-sion-trans-gression-regression process of Bohai.

辽南滨海黄土具有沙黄土特征,主要由末次冰期低海面裸露的渤海海底物质经西北风短距离搬运堆积而成;黄土剖面中22~3φ粒级含量高~低~高变化(粗~细~粗粒度韵律层),表明沉积时干冷~湿凉~干冷的古气候特征及渤海海退~海侵~净退的历史。

Through X-ray diffraction and transmission electron microscope photographs it is discovered that there are many minerals, such as Calcite, Cypsum, Halite and Palygorskite, which have a unique environment and special deposit features in the sediments of the Don Juan pond. Because the solubility product of carbonate calcium controlled the mechanism of transformation from Anhydrite to Calcite effectively, there was higher content of Calcite in the surface crumble sediments of the basin bottom.

本文通过X射线衍射图谱分析和透射电子显微镜照片鉴定,南极东胡安池塘沉积物中,存在着具有代表独特环境特征和沉积学特征的方解石、石膏、石盐和坡缕石等矿物。由于碳酸钙溶度积有效地控制硬石膏向方解石矿物转化机理,所以在盆地下表层细粒碎屑沉积物中方解石的含量偏高。东胡安池塘的原先深坑凹道可能是古地理年代中地震或火山爆发所造成,盆地内940,000×10~3kg可溶性盐类沉积物,也许是过去长期海浸—海退—海侵—海退的反复过程中,被侵蚀凝聚沉淀和期后冰川剥蚀的结果。

Through the study on the bio-stratigraphy, sequence and chemo-stratigraphy from the Or-dovician/Silurian boundary section in Wangjiawan, Huanghuachang, Fengxiang of Yichang County and the newly founded one in Goujiaya of Yuan 'an County, the fossil zones of the upper-most Ordovician and the lowermost Silurian are securely re-established in ascending order; Nankinolithus zone, Dicellograptus complexus zone, Paraorthograptus pacificus zone, Nor-malograptus bohemicus-N. extraordinarius zone, Hirnantia-Kinnella...

Through the study on the bio-stratigraphy, sequence and chemo-stratigraphy from the Or-dovician/Silurian boundary section in Wangjiawan, Huanghuachang, Fengxiang of Yichang County and the newly founded one in Goujiaya of Yuan 'an County, the fossil zones of the upper-most Ordovician and the lowermost Silurian are securely re-established in ascending order; Nankinolithus zone, Dicellograptus complexus zone, Paraorthograptus pacificus zone, Nor-malograptus bohemicus-N. extraordinarius zone, Hirnantia-Kinnella zone, Glyptograptus? persculptus zone, Akidograptus ascensus zone, Parakidograptus acuminatus zone and Or-thograptus vesiculosus zone. Moreover, the Paraorthograptus pacificus zone could be further divided into Pararetiograptus sinensis sub-zone, Tangyagraptus typicuas and Diceratograptus mirus sub-zone. Further more, the paper points out, that, no hard evidences can prove consistent between the basement strata of the P. acuminatus zone from the Dob's Linn Section of the International Typical Boundary Section of Ordovician/Silurian in England and the strata in which the FAD firstly appeared in this area. Therefore, it could be suggested that modifying Ashigill Series to Ashigill Stage contained two sub-stages, and the upper "Hirnantian Sub-stage" and "Ordovician/Silurian Boundary" are better shifted, respectively, downward to the bottom of P. pacificus zone and G.? persculptus zone. The basic boundary of the Hirnantian sub-stage is approximately identical to the locality of the maximum flooding surface which was formed during transgression period after regression (NRE) of uppermost part in Late Ordovician Nankinolithus zone. However, the O/S boundary consists with the global transgression/regression time (HRE) which was directly caused by the rapid icecap melting in the central super-continent Gondwana. It was also i-dentical to the iridium and carbon isotope anomaly, to the sharply variety of geo-chemical phase of atmosphere and ocean, and, which caused the mass extinction could be considered to be related to the sudden rising of CO2 components. Therefore, the Section in Wangjiawan of Yichang should be capable of the best selection one for the identification global Ordovician/Silurian boundary sequence and the newly redefined "Hirnantian Sub-stage".

根据对湖北宜昌王家湾、黄花场、分乡以及新近发现的远安苟家垭奥陶系与志留系界线剖面生物地层、层序地层和化学地层的综合研究将该区最晚奥陶纪到最早志留纪的化石带自下而上重新厘定为Nankinolithus带,Dicellograptus complexus带,Paraorthograptus pacificus带,Nor-malograptus bohemicus-N.extraordinarius带,Hirnantia-Kinnella带,Glyptograptus? persculp—tus带,Akidograptus ascensus带,Parakidograptus acuminatus带和Orthograptus vesiculosus带,其中Paraorthograptus pacificus带可分为Pararetiograptus sinensis亚带,Tangyagraptus typicuas和Diceratograptus mirus亚带。指出目前尚无可靠证据证明国际奥陶系与志留系界线层型剖面,即英格兰Dob’s Linn剖面P. acuminatus带底部与该种首次出现(FAD)的层位一致。建...

根据对湖北宜昌王家湾、黄花场、分乡以及新近发现的远安苟家垭奥陶系与志留系界线剖面生物地层、层序地层和化学地层的综合研究将该区最晚奥陶纪到最早志留纪的化石带自下而上重新厘定为Nankinolithus带,Dicellograptus complexus带,Paraorthograptus pacificus带,Nor-malograptus bohemicus-N.extraordinarius带,Hirnantia-Kinnella带,Glyptograptus? persculp—tus带,Akidograptus ascensus带,Parakidograptus acuminatus带和Orthograptus vesiculosus带,其中Paraorthograptus pacificus带可分为Pararetiograptus sinensis亚带,Tangyagraptus typicuas和Diceratograptus mirus亚带。指出目前尚无可靠证据证明国际奥陶系与志留系界线层型剖面,即英格兰Dob’s Linn剖面P. acuminatus带底部与该种首次出现(FAD)的层位一致。建议将英国Ashipill统改为阶,内部分两个亚阶,其上部“Hirnantian”亚阶和O/S界线应分别下移到P.pacificus带底部和G.?persculptus带底界。前者的底界与晚奥陶世Nankinolithus带顶部海退事件(NRE)后海侵所形成的最大海泛面的位置基本一致;后者与古冈瓦纳超大陆中部冰盖快速消融所引起的全球海退/海侵时间(HRE)和铱、碳同位素异常以及海洋及大气地球化学状况的突然改变相吻合,?

 
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