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硅藻化石
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  diatom fossil
    Our research found abundant diatoms in the cores both of drill CH6 in Wenzhou and of drill CH5 in Taizhou, and we set up the diatom assemblages in the Late Quaternary according to the diatom fossil of CH6, and then 12 diatom biozones were given and the paleoenvironment restored. The age of the section should be Early and Middle Holocene according to four AMS 14 C dates.
    本项研究在温州 CH6井、台州 CH5井岩心中发现了大量硅藻化石 ,本文以温州 CH6井丰富的硅藻化石为依据 ,建立了晚第四纪硅藻组合序列 ,划分为 12个硅藻带 ,并恢复其古环境演替 ,根据四个 AMS1 4C年代数据 ,其时代属早、中全新世
短句来源
  diatom fossil
    Our research found abundant diatoms in the cores both of drill CH6 in Wenzhou and of drill CH5 in Taizhou, and we set up the diatom assemblages in the Late Quaternary according to the diatom fossil of CH6, and then 12 diatom biozones were given and the paleoenvironment restored. The age of the section should be Early and Middle Holocene according to four AMS 14 C dates.
    本项研究在温州 CH6井、台州 CH5井岩心中发现了大量硅藻化石 ,本文以温州 CH6井丰富的硅藻化石为依据 ,建立了晚第四纪硅藻组合序列 ,划分为 12个硅藻带 ,并恢复其古环境演替 ,根据四个 AMS1 4C年代数据 ,其时代属早、中全新世
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  “硅藻化石”译为未确定词的双语例句
    Paleoclimatical History Recorded by Diatom Assemblages from the Huguangyan Maar Lake in Zhanjiang Since the Last 31.5 ka to 10 ka
    湛江湖光岩玛珥湖31.5-10ka硅藻化石记录及古气候变迁
短句来源
    2. According to the record of diatom, the sequence of the diatom associations inthe last 31.5 ka to 10 ka have been established for this region.
    2、根据硅藻化石记录,建立了湖光岩玛珥湖31.5-10 ka的硅藻组合演化序列。
短句来源
    The sediment of 4 well's cores of late Quaternary at the continental margin of East China Sea have been systimatically researched, and abundant fossils of diatom, 117 species and varieties in 33 genus, have been found.
    对东海陆缘 (闽北段 )晚第四纪沉积 4口钻井岩心进行系统的硅藻分析研究 ,获得丰富的硅藻化石 ,共发现硅藻 117种和变种 ,分属于 33个属。
短句来源
    Three assemblagezones and five assemblage subzones in zone Ⅲ are defined based on the abundanceof the diatom and characters of the key species, describing the character of everyassemblage zone and subzone in detail.
    根据硅藻化石丰度和主要属种变化特征,划分3个硅藻化石组合带,并在组合带Ⅲ内部划分5个亚组合带,并详细分析了各组合带和亚组合带的硅藻组合特征。
短句来源
    A dopting synthetic analyses of diatom group, physical phase assembly, chemical compositions and microelements, the original growth environment and burying condition of diatoms occuring in diatomaceous earth(DE) deposits of China, are studied, which indicates that:1) DE deposits in China almost are lacustrine cause of formation of land facies, water bodies of diatom growth mainly were fresh, few were salt or half salt;
    根据国内硅藻土矿床中硅藻土的硅藻化石组合、物相、化学成份及微量元素特征的分析,对我国地质时期硅藻的生长环境及堆埋条件进行了深入研究,结果表明:1)硅藻生长的水体基本上为陆相淡水湖泊型,其生长所需的硅藻质SiO2主要来源于火山作用;
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  diatom fossil
A total of six major and sub-zones are recognized according to the diatom fossil assemblages, and we discuss aquatic environmental change in Lake Kitaura mainly based on these diatom assemblage change.
      


The fossil diatom in the Yellow Sea since the Late Pleistocene can be divided into five diatom zones in ascendant order.

黄海更新世晚期以来的硅藻化石,自下而上可划分为五个硅藻带。在Ⅰ带的上下层位,各含一个淡水藻类化石带,显示黄海在大理冰期时,由于气候变冷,海面下降,黄海陆架三次出露成陆。亚间冰期时,气候转暖,海面回升,复为海水淹没,海域中生长着Ⅰ带的各种海生硅藻。随着全新世气候转暖,沉积物中发现Ⅱ—Ⅴ带海生硅藻带,其中Ⅲ带硅藻外洋种比例较大,含亚热带暖海种多,表明此时水温较大,海域扩大,相当于大西洋期,其他各带与全新世各期相当。

A new diatom species, Actinella miocenica is erected and described inthis paper. The species was collected from diatomiferous sediment croppingout at Qui Ligou, Deng Hua County, Jiling Province, China. It is charac-etrized by valve clavate, with ends of obtuse rounded and acute rounded.Frustule in girdle view cuneate, without the intercalary band and shortsepta. The specimens of this pater were examined using a Scanning ElectronMicroscopy, each end of valve in inner valve view, with a 1abiate process.Them found...

A new diatom species, Actinella miocenica is erected and described inthis paper. The species was collected from diatomiferous sediment croppingout at Qui Ligou, Deng Hua County, Jiling Province, China. It is charac-etrized by valve clavate, with ends of obtuse rounded and acute rounded.Frustule in girdle view cuneate, without the intercalary band and shortsepta. The specimens of this pater were examined using a Scanning ElectronMicroscopy, each end of valve in inner valve view, with a 1abiate process.Them found are important on the Taxonomy of Actinella genus. The newfossil diatom recorded from miocene continental strata. The research onnew species plags an important significancei in stratigraphic subdivisionand correlation.

东北地区是我国非金属矿——硅藻土矿蕴藏量非常丰富的地区之一,其中吉林省又是三省之冠。中新长茅藻Actinella miocenica Li,sp。nov.就发现在敦化地区新生界盆地的硅藻土矿层中。硅藻土矿在敦化地区主要分布在高松树、秋梨沟一带,在两处的硅藻土中,都保存了丰富的硅藻植物化石,中新长茅藻就是这些硅藻化石中的一个新化石种。

The taxonomy, stratigraphy and palaeoecology of the fossil diatoms from the grey mudstone of the upper Xiaolongtan Group of the Kebao Basin, Yiliang, Yunnan Province, have been studied, with 46 species(including one new species and one new variety)belonging to 16 genera described in this paper. This diatom assemblage is considered as Late Miocene in age based on the following evidences:1. As shown in Table 1, the 31 diatom taxa of the Xiaolongtan Group were also reported from other 4 Miocene deposits(Changbai,...

The taxonomy, stratigraphy and palaeoecology of the fossil diatoms from the grey mudstone of the upper Xiaolongtan Group of the Kebao Basin, Yiliang, Yunnan Province, have been studied, with 46 species(including one new species and one new variety)belonging to 16 genera described in this paper. This diatom assemblage is considered as Late Miocene in age based on the following evidences:1. As shown in Table 1, the 31 diatom taxa of the Xiaolongtan Group were also reported from other 4 Miocene deposits(Changbai, Shanwang, Chengxian of China and Oregon of U. S. A.) indicating the similarity of the Yiliang diatom flora to other floras. Among them, Melosira ambigua is as abundant in Yiliang as in Oregon; Fragilaria construens and F. construens var. venter, are very abundant both in the fossil diatom assemblage of Yiliang and Shanwang. In addition, the fossil diatom Gomphonema tergestinum var. shantungensis first described by Skvortzov in 1937 from the Miocene deposit of Shanwang in Shandong Province, was also found in the Yiliang materials.2. According to analysis of lacustrine diatom biochronology(Krebs, Bradbury, Theriot, in press), the diatom genera Stephanodiscus and Cyclostephanos are well-preserved and abundant in the Pliocene. However, neither of them has been observed in the Yiliang flora, probably showing that the age of the Yiliang flora is earlier than Pliocene. Another genus, Cyclotella, is often found in great abundance in the Late Miocene diatom flora; this genus is not preserved in the Middle Miocene Shanwang diatom flora, but is common in the Yiliang diatom flora. Therefore, the Yiliang diatom flora can be inferred as Late Miocene in age.3. The available evidences from other associated fossils, e.g. fossil plant, sporo-pollen and mammals also indicate a Late Miocene age for the Xiaolongtan Group.According to ecological analysis of this diatom assemblage, the palaeoenvironment of the Kebao Basin in the Late Miocene can be restored as a shallow, medium-sized plateau freshwater lake under warm arid climate condition and the water body can be considered as eutrophic with a high pH value.Description of new taxaCyclotella yiliangensis sp. nov.(Pl. Ⅰ, fig. 4; Pl. Ⅲ, figs. 8—10)Frustules discoid, solitary. Valve light, concentrically inflated, normally 12—20μm in diameter. Valve structure difference between central and marginal areas under LM unclear. A circle of small round pores between margin and center can be considered as boundary line between the two areas of outer valve under SEM, which appear to be trian gular in inner valve. Striae radiated regularly with 16—17 in 10μm, short blank strips present along valve margin appearing as marginal strutting tubes in inner valve, with 4—5 in 10μm.Type No. YY-65B.Remarks This new species is similar to the species of the genera Stephanodiscus and Thalassiosira, as the valve in structure difference between the central and marginal areas is unclear under LM. But under SEM, the inner valve is observed to possess triangular pores characteristic of the genus Cyclotella.Locality Yiliang, Yunnan, ChinaFragilaria construens var. yiliangensis var. nov.(Pl. Ⅰ, fig, 2; Pl. Ⅳ, figs. 11, 12)Frustules solitary or forming straight filament. Valve linear-lanceolate in shape, 20—30μm in length and 4—6μm in width, with both margins straight, narrowing towards the somewhat rostrate apices; end of valve round. Pseudoraphe lanceolate in shape. Striae slightly radiate throughout the valve, with 13—15 in 10 μm.Type No. YY-64B.Remarks This variety seems to be closely related to var. pumila and var. binodis; however, it actually differs in the shape of the valve with straight linear margins.Locality Yiliang, Yunnan, China.

本文系统地描述和研究了产自云南省宜良县可保村小龙潭组上段灰色泥岩层中的硅藻植物群,计有16属46种(变种),其中含1新种和1新变种。根据硅藻植物群组合面貌的分析,推断该区在这一时期的沉积环境应为温暖干燥气候下的中型高原浅水型淡水湖泊。本文系统分析了宜良小龙潭组的硅藻化石群组成成分,并与国内外其它中新世地层的硅藻化石群进行对比,从而确定该组硅藻化石群所代表的时代应隶属中新世晚期。研究发现的新种(变种)是:宜良小环藻Cyclotello yiliangensis sp.nov.和缢缩脆杆藻宜良变种Fragilaria construens var.yiliangensis var.nov.。

 
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