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Being well-developed and widespread, the Triassic in China occursin two sedimentary domains, the north and south domains separated bythe Qinling-Kunlun and characterized by fossil spores and pollen.The north sedimentary domain, represented by the Shaanxi-Gansu-Ningxia Basin and Qingshui Basin, is characterized by continental Tria-ssic, with three spore and pollen assemblage zones enumerated in ascen-ding order as follows. 1. The Lundbladispora-Taeniaesporites assemblage zone is eiquval-ent in horizon to Early...

Being well-developed and widespread, the Triassic in China occursin two sedimentary domains, the north and south domains separated bythe Qinling-Kunlun and characterized by fossil spores and pollen.The north sedimentary domain, represented by the Shaanxi-Gansu-Ningxia Basin and Qingshui Basin, is characterized by continental Tria-ssic, with three spore and pollen assemblage zones enumerated in ascen-ding order as follows. 1. The Lundbladispora-Taeniaesporites assemblage zone is eiquval-ent in horizon to Early Triassic Liujiagou Formation (T_1~1) and Heshan-ggou Formation (T_1~2). It may be subdivided into two subzones, that is,the lower Lundbladispora-Taeniaesporites-Cycadopites subzone and the upper Lundbladispora-Verrucosisporites-Taeniaesperites subzone. 2. The Punctatisporites-Chordasporites assemblage zone corresponds toErnma Formation (T_1~2) and Tongchuan Formation (T_2~2), of MiddleTriassic age. This assemblage is composed of two assemblage subzones,the lower Punctatisporites-Chordasporites-Plicatipollenites subzone and theupper Punctatisporites-Granulatisporites gigantus-Chordasporites subzone. 3. The Dictyophyllidites-Apiculatis poris-Lueckisporites triassicus as-semblage zone equals in horizon to the Yanchang Formation, of LateTriassic. Abundant megaspores have been also found in all those assemblagezones of Triassic. The south sedimentary domain: The Middle and Lower Triassic con-sists mainly of marine deposits, yielding spores and pollen in a few loca-lities, while the upper Triassic is made up of continental or paralicdeposits rich in sporopollen assemblages. As represented by their deve-lopment in Sichuan and Guizhou, the middle and upper series are sub-divided into three assemblage zones: 1. The Verrucosisporites-Corisaccites assemblage zone corresponds inhorizon to the Middle Triassic Guan1in Formation in Weining, Guizhou. 2. The Corollisporites-Micrhystridium assemblage zone is equivalentin horizon to the early Late Triassic Maantang Formation in Sichuan. 3. The Kyrtomisporis-Ricciisporites assemblage zone equals inhorizon to Xujiahe Formaton in Sichuan, of middle and late phases ofLate Triassic. Equivalent beds bearing this assemblage are also rich inmegaspores which are composed of Trileites pinguis, Bacutriletes tylotus,Nathorstisporites hopliticus etc. The data indicated that sporopollen assemblages of the south sedi-mentary domain are quite different from those of the north domain andthat such a sporopollen difference is consistent with the conclusion rea-ched for the existence of Triassic floral provinces.

文中介绍了我国陆相三叠纪的地层概况,重点对我国南北方孢粉组合进行了初步总结,并建立了三叠纪孢粉组合带。北方分三个带、四个亚带;南方(除早三叠世外)建立了三个组合带。同时根据孢粉组合特征,初步探讨了三叠纪的植物分区。

The present paper describes 10 genera and 18 species of stromatoporoids with such most importantforms as Actinostroma clathratam Nicholson; A. cf. crassepilatum Lecompte, Clathrostroma bifarium(Nicholson), Synthetostroma acttnostromoides Lecompte, Stromatopora hiipschii Bargatzky, S. cf. cima-censis (Lecompte), S. cf. maiUieuxi (Lecompte), Parallelopora ostiolata Bargatzky, P. goldfussii Bar-gatzky and Stachyodes insignia Yavorsky. These species may be correlated with those of West and SouthChina, and also with...

The present paper describes 10 genera and 18 species of stromatoporoids with such most importantforms as Actinostroma clathratam Nicholson; A. cf. crassepilatum Lecompte, Clathrostroma bifarium(Nicholson), Synthetostroma acttnostromoides Lecompte, Stromatopora hiipschii Bargatzky, S. cf. cima-censis (Lecompte), S. cf. maiUieuxi (Lecompte), Parallelopora ostiolata Bargatzky, P. goldfussii Bar-gatzky and Stachyodes insignia Yavorsky. These species may be correlated with those of West and SouthChina, and also with those occurring in the equivalent beds of many European countries and Canada,providing evidence for determining the Chitzechiao Formation is late Middle Devonian in age. The Jukoupu reefs occur in the Middle Devonian Chitzechiao Formation, a transition belt with afacies change from open shallow-sea marl to platform shallow-sea carbonate rocks. Based on the dif-ference in sedimentary features, the reefs may be divided into two parts. The reefs in the lower partare clearly stratified and consist of thick-bedded framestones with stromatoporoids and massive corals.The thick-bedded limestones are intercalated with thin-bedded yellow mudstone, marl or mud shalewith a thickness of 20--30 cm, indicating short-term and periodic changes in sedimentary environ-ment. The reefs in the upper part are separated from the lower reefs by a nearly 10 m thick layer ofcrinoidal limestone. The limestone with a total thickness of 120 m is poorly stratified, containingmonotonous fossils mainly with crinoidai stems,dendritic or straticulate stromatoporoids and aiveolites. Based on field observation and indoor identification, the Jukoupu reefs may be divided into 8 sed-imentary microfacies, namely, micrites with massive stromatoporoids frames; mudstone-shale facies;micrites with massive compound coral frames; sparites with crinoidal fragments; biomicrosparites withbiogenic incrustation; biobaffling micrites; oncolite micrites; and bioelastic micrites. The developmental process of the Jukoupu reefs may be as follows: nearshore normal shallow-sea environments--stromatoporoid reefs developed in the transitional belt--closed or semiclosed environ-ments of back-reef facies abnormal salinity. The characteristics of the life assemblages and sedimenta-ry facies generally vary with changes in sedimentary environments.

湖南新邵巨口铺泥盆纪生物礁出现在中泥盆统棋梓桥组中上部,根据沉积特征的差异,礁体分上下两部分;下部成层性明显,以厚层生物格架灰岩为主;上部以灰白色块状徽晶一亮晶灰岩为主,灰岩成层性很差,生物也较单调。礁体可划分8种沉积微相,其发展过程有明显阶段性。这些阶段性与礁体群落的发展和演替相联系。它是开阔浅海与台地浅海相变过渡带上的一种层状礁。礁体内有丰富的层孔虫,计16属近40种。该文选择了较为常见、保存较好的10属18种进行了描述和研究。

The small outcrop, a part of Guilin Formation, is about 30m thick and represents a deposits from subtidal lagoon to tidal flat in the carbonate platform. Its fossils are characterized by Amphipora sp. (or Paramphipora sp.), Tenticospirifer and the fossils of its equivalent beds are marked by Ozarkodina poster, Icrious alternants alternatus, 1. a. helmsi , indicating a late Frasnian age.

桂林地区泥盆纪弗拉斯晚期的沉积物以含有大量细枝状的双孔层孔虫为特征,并表现出明显的旋回性。本文研究认为,双孔层孔虫最适宜在潮下带弱动荡环境中生长。完全闭塞,滞静的泻湖不利于双孔层孔虫的生长,只能是其堆积的场所。

 
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