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ice rafting
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  相似匹配句对
     Ice
     冰
短句来源
     iCE AGE
     冰川时代
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     An Analysis of Rafting Length of Rafted Ice in Bohai Sea
     渤海海冰的重叠长度分析
短句来源
     RAFTING ON DOUBLE STREAM
     国家AAAA级景区 双溪漂流妙趣横生
短句来源
     The calculated results show that the rafting length of sea ice are mainly dominated by the buckling failure of ice cover.
     结果表明 :海冰重叠长度主要由海冰屈曲破坏条件来决定 ;
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  ice rafting
Comparatively large clastics were transported from outside of the lake through various routes (ice rafting, etc.) in addition to fluvial routes during the 'glacials' or 'stadials'.
      
Observed sediment accumulation rates, from 0 to 13 mm yr-1, were compared with marsh morphology, local relative sea-level rise rate, mean tidal range, and ice rafting activity.
      
Impacts of glacial-interglacial variations and locally derived ice rafting events (IRE), comparable with the North Atlantic Heinrich events (HE) have been recognized in both provinces.
      
We observed a dramatic increase in ice rafting debris at site 882 at 2.75 Ma, which is coeval with that found in the Norwegian Sea, suggesting that the Eurasian Arctic and Northeast Asia were significantly glaciated from 2.75 Ma onwards.
      
This information, when added to intermediate levels of CO2 and to the absence of clear ice rafting associated with DO 25, highlights the uniqueness of this first event, while DO 24 and 23 appear similar to typical full glacial DO events.
      
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The study area where lower Sinian strata developed and exposed well is one of the important areas where eastern Sanxia stratotypic section in China is supplemeted. In the light of the methods of lithstratigraphy and climatic stratigraphy as well as the stratigraphic correlation to adjacent areas, the author has newly divided the lower Sinian strata in north Guangxi into five formations.namely from bottom to top, Changan Formation,Fulu For-mation,Tiesian Formation,Datangpo Formation and Nantuo Formation; Therefore,...

The study area where lower Sinian strata developed and exposed well is one of the important areas where eastern Sanxia stratotypic section in China is supplemeted. In the light of the methods of lithstratigraphy and climatic stratigraphy as well as the stratigraphic correlation to adjacent areas, the author has newly divided the lower Sinian strata in north Guangxi into five formations.namely from bottom to top, Changan Formation,Fulu For-mation,Tiesian Formation,Datangpo Formation and Nantuo Formation; Therefore, the author has studied the sedimentary facies of each formation in the area, mainly including moraine-mudflow facies, ice rafting-normal oceanic facies, turbidite facies, offshore shelf shallow facies and interbank depressions, and has briefly stated the evolution of sedimentary facies in time and space. All these studies on solving the unity of stratigraphic division and correlation and the evolution of sedimentary facies in time and space in whole of South China Sinian is of significance.

研究区下震旦统发育,出露良好,是扩充和完善我国峡东层型剖面的重要地区之一。依据岩石地层学、气候地层学的方法、及与邻区的对比,本文对桂北地区下震旦统进行了新的划分:由下向上划分为长安组、富禄组、铁丝坳组、大塘坡组和南沱组;在此基础上对区内各组沉积相进行了研究,主要包括冰碛泥石流相、冰筏-正常海洋相、浊流相、滨外陆棚浅滩相、滩间洼地区,并简述了沉积相的时空演化规律。这些研究对解决整个南方震旦纪地层划分对比的统一及沉积相的时空演化具有重要意义。

Bikou Group is distributed on the northwestern margin of Yangtze Plate at the conjun- ction zone of Shaanxi-Gansu-Sichuan provinces.Previous studies suspected that it is the glacial deposits.The authors recently obtained a lot of glacial evidence,studied the distribution,ho(?)- zons and depositional characters of the tillites,and makes a division and correlation of the glacial periods. Tillites are mainly distributed on the northern side and periphery of Bikou Group,especi- ally in Gansu Province.Their horizons...

Bikou Group is distributed on the northwestern margin of Yangtze Plate at the conjun- ction zone of Shaanxi-Gansu-Sichuan provinces.Previous studies suspected that it is the glacial deposits.The authors recently obtained a lot of glacial evidence,studied the distribution,ho(?)- zons and depositional characters of the tillites,and makes a division and correlation of the glacial periods. Tillites are mainly distributed on the northern side and periphery of Bikou Group,especi- ally in Gansu Province.Their horizons are located in the upper and lower driftsheets of Yang- tianba and Nantuo Groups of Lower Sinian System.A large number of micro-palaeophytes was found in every group of tillitebearing beds of Sinian System.The authors measured the age of overlying pre-Sinian System to be 800—1000 Ma.The overlying beds of Sinian System are Lower Cambrian Series,in which fossils were found.The authors measured its Rb-Sr age to be 561±20 Ma.According to the micro-palaeophytes,isotopic ages and the time of overlying and underlying beds,the horizon of tillites should be Lower Sinian Series. The tillites are roughly of three types:mastive,lamellar and bedded gravel-bearing tillires. Among them massive tillite is dominant,without bedding and sorting of gravels.The gravels nonuniformly scatter in the cements.The gravels and cements change from place to place.In some places the cements have schistositized by the effect of epigenetic processes and changed into the gravel-bearing phyllites.In the tillites basal moraines of continental glacier are do- minant,part of them probably is periglacial sea and ice-sea deposits and aquatillites in which laminated tillite has lamellar structures,containing dropstones.The tillite occurs mainly at the top of massive tillite or within it,generally of small thickness.It represents glacial-lake depo- sits or preglacial fluvioglacial deposits.Bedded tillite represents marine sedimentary rocks con- taining gravels or rock-fragments and dropstones and is characterized by floating ice sediments or ice rafting sediments.It mainly developed in the lower part of Yangtianba Group,within the sandstones and slates. In the above-mentioned tillites numerous traces of glaciation and ablation were frequently found,such as striated pebbles,compresso-shear stones,drift boulders,dropstones and gravels of various shapes. This set of glacial deposits is extensively distributed in China and has global significance. According to sedimentary characteristcs,metanorphic grade and the relations with overlying and underlying beds,the tillites in Bikou Group formed in Changan and Nantuo glacial per- iods.The Nantuo glacial period can also distinguished into two stages.On the basis of stratigr- aphic horizons,micro-paleoplants and sedimentary characteristics the Changan glacial period can be correlated with that in Hunnan-Guizhou-Guangxi region and with Beiyixi glacial per- iod in Xinjiang region,and can also be correlated with Stetrau till sheets of Wongbeilata Group in Adelaide region,Australia.Nantuo glacial period can be correlated with that in North Jiangxi and Hunan-Guizhou-Guangxi region,and with Teruiaiken glacial period in Xingjiang region,and can also be correlated with Walanger Group in Scandinavia of northwest Europe.

碧口群内前人曾怀疑为冰碛岩的一套岩石,已取得了大量冰川证据,肯定了冰川作用的存在。其时代属早震旦世。据沉积特征、层位及上下接触关系等,将其划为长安、南沱两个冰期,南沱冰期又进一步划分为两个亚冰期,并分别与国内外有关地区作了对比。

A primary research on the sedimentary characters and micropaleontologic assemblages of Yaolinghe Group in the southeast border of the Wudang Mountains nappe shows that Yaolinghe Group belongs to sedimentary pyroclastic rock type and has the properties of ice rafting-marine volcanic sedimentary,The stratigraphic time of Yaolinghe Group is establised as Sinian period according to the time range of glacigenous rocks, micropaleontologic fossils and isotopic age.

通过对武当山推覆体东南缘耀岭河群沉积特征和微古植物组合面貌的初探,认为耀岭河群属沉积火山碎屑岩类型并兼有冰筏-海相火山沉积特点,结合冰成岩时限、微古化石及同位素年龄数据等,将研究区耀岭河群的地层时代确定为震旦纪。

 
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