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化石碳酸盐岩
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  fossil carbonate
     ANALYSIS OF LOWER MIDDLE JURASSIC FOSSIL CARBONATE MICROFACIES AND SEDIMENTARY ENVIRONMENTS IN NYALAM,TIBET
     西藏聂拉木地区中、下侏罗统化石碳酸盐岩微相研究及沉积环境分析
短句来源
     Eocene fossil carbonate microfacies and sedimentary environment in Gangba-Tingri,southern Tibet
     藏南岗巴—定日地区始新世化石碳酸盐岩微相与沉积环境
短句来源
  相似匹配句对
     CLASSIFICATION OF CARBONATE ROCKS
     碳酸盐岩分类
短句来源
     Talk about fossil energy
     漫谈化石能源
短句来源
     On Data Processing of Isotope of Carbonate Rocks
     碳酸盐岩同位素数据处理
短句来源
     On fossil dinosaur eggs
     恐龙蛋化石研究
短句来源
     Eocene fossil carbonate microfacies and sedimentary environment in Gangba-Tingri,southern Tibet
     藏南岗巴—定日地区始新世化石碳酸盐岩微相与沉积环境
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  fossil carbonate
Dated fine sands are older than medium to coarse sands and hence may constitute a reservoir of fossil carbonate that is distributed over the entire shoreface.
      
Suspended particulate matter between the coast and the inner arc of the reef was mainly composed of kaolinite clay and reworked fossil carbonate fragments, resuspended from nearshore shoals.
      
Reported data on Sr in Recent carbonate secreting organisms, Recent and fossil carbonate sediments, on partition between calcite, aragonite and seawater have been used for comparison with those of the Upper Jurassic carbonate rocks.
      
The latter should be kept in mind when using bulk isotope values for chemostratigraphy or for paleo-environmental reconstructions in fossil carbonate ramps and platforms.
      
Although not common today, these structures are an important part of the fossil carbonate spectrum and must be integrated into the reef model.
      
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The materials analyzed in this paper were mainly collected from the Niehnieh Hsiongla Section in southern Tibet in 1995.The Jurassic of this area was divided into the Lower Jurassic Pupuga and Middle Jurassic Niehnieh Hsiongla formations.They are composed of marine clastic and carbonate rocks.The carbonate deposits account for 60 percent of the sedimentary rocks.According to textural origin classification,types of grains,sedimentary structures and fossils,the carbonate rocks can be recognized as three types...

The materials analyzed in this paper were mainly collected from the Niehnieh Hsiongla Section in southern Tibet in 1995.The Jurassic of this area was divided into the Lower Jurassic Pupuga and Middle Jurassic Niehnieh Hsiongla formations.They are composed of marine clastic and carbonate rocks.The carbonate deposits account for 60 percent of the sedimentary rocks.According to textural origin classification,types of grains,sedimentary structures and fossils,the carbonate rocks can be recognized as three types consisting of twelve kinds of microfacies:grainstone(MG1 to MG8 microfacies),wackstone(GM1 and GM2 microfacies)and mudstone(M1 and M2 microfacies).Each microfacies represents respectively different sedimentary conditions and environments.Four kinds of microfacies associations are classified on the basis of neighbouring and paragenetic relationship of microfacies,as well as characteristics of fossil assemblages. Each microfacies association corresponds a designated sedimentary environment and its evolution.Although many types of sedimentary environments have been discerned in the study area,the sedimentary environment of the Early Middle Jurassic is dominated by shoreface and shallow water sea.In this paper,the authors suggest that the Early Middle Jurassic sea level changed periodically,and this change shows the characteristics of the initial stage of passive continental margin.In general,the Early Middle Jurassic of the region was in a transgression period which is related to the expansion of the Himalayan ocean.

西藏聂拉木地区早、中侏罗世碳酸盐岩分布广泛,岩石类型多,海相化石丰富。在结构成因分类基础上,将本区碳酸盐岩分为3个大类、12种化石碳酸盐岩微相类型,分析了每种微相的基本沉积条件和形成环境。根据微相的相邻和共生关系,建立了4个主要微相组合,解释了各种微相组合的沉积环境及其演化,建立了藏南早、中侏罗世的沉积模式。通过综合分析认为,该地区中、下侏罗统普普嘎组及聂聂雄拉组是大西洋型被动陆缘的产物。

Through the 1∶50 000 scale regional surveys , Poziquan formation in Poziquan area of Hami was established, which represents a carbonate containing many fossls The time is Viseum of early Carboniferous The classification history, stratotype section and depositional environment, palaeontological features or geological time, regional distribation and their significance of Poziquan formation are introduced

经1∶5 万区调填图,在哈密市坡子泉地区新命名地层单位———坡子泉组,用以代表一套含丰富生物化石的碳酸盐岩,其时限为早石炭世韦宪期。同时介绍了坡子泉组的划分沿革、层型剖面及沉积环境分析、古生物特征及地质年代、区域分布特征和地质意义。

Cold seepage and venting is a fluid seepage and venting mainly composed of water, hydrocarbon(gas and crude oil), hydrogen sulfide and fine sediments derived below seafloor. Its temperature is similar to sea water and widely occurs on the seafloor of continental slope of active and passive margins. Cold seepage and venting-related chemosynthetic communities are highly in organism density, mainly mussels, clams, tube worms and bacterial mats. The sediments in cold seepage and venting are mostly maed up of...

Cold seepage and venting is a fluid seepage and venting mainly composed of water, hydrocarbon(gas and crude oil), hydrogen sulfide and fine sediments derived below seafloor. Its temperature is similar to sea water and widely occurs on the seafloor of continental slope of active and passive margins. Cold seepage and venting-related chemosynthetic communities are highly in organism density, mainly mussels, clams, tube worms and bacterial mats. The sediments in cold seepage and venting are mostly maed up of carbonates and gas hydrates with minor sulfides and sulphates. The chemosynthetic carbonates occurred as buildup, chimney, cement, nodule, hardgroud and fine vein, and generally as buildup of chemosythetic bioclasts and multi-stage authigenic cements. The carbonate source, sedimentary environment and sedimentations are different with normal carbonates,of which carbon is from sea water. Therefore, using term "Chermoherm" represents the chemosynthetic carbonate buildup to distinguish from the terms of bioherms, lithoherms, pseudobioherms, biostromes of carbonate buildups in normal sea environment,in which the carbon is from sea water. In strata, Chermoherm frequently occurred in abyssal sediment strata as a carbonate buildup containing a lot of fossils of benthic fauna. There are disrupted sedimentary phase and environments in longitudinal and cross strata section, so much as turnover. Carbonate minerals in chemosynthetic carbonates are primarily Mg-calcite, aragonite, and dolomite,which are not different with normal carbonates. Carbon isotope values in chemosynthetic carbonates are very low due to bacteria mediation. Cold seepage and venting occurred along fault zone or permeable beds and at the surface expression of mud volcano and salt diapirism. Cold seepage and venting fluids are derived from formation fluids driven by a combination of (1)pore-space reduction of rapid sedimentation and tectonic compaction, deformation and cementation, and (2)increased buoyancy due to a decrease in pore-fluid density related diagenesis and catagenesis, and gas hydrate decomposition at depth. The sedimentation processes of cold seepage and venting-related carbonates are cementation, filling action and biochemical sedimentation. The hydrocarbon mainly of methane into cold seepage and venting is changed to carbon dioxide by bacteria mediation and deposited chemosynthetic carbonates.

冷泉流体是指来自海底沉积界面之下的低温流体以喷涌和渗漏方式注入盆地 ,并产生系列的物理和化学及生物作用 ,这种作用及产物称为冷泉。它是继洋中脊以盆下源中高温流体的热泉被发现和研究之后的又一个新的盆地流体沉积领域。日前研究较多的是以水、碳氢化合物 (天然气和石油 )、硫化氢、细粒沉积物为主要成分 ,温度与海水相近的流体 ,广泛发育于活动和被动大陆边缘斜坡海底。冷泉流体沉积体系发育高密度的化学自养生物群 ,以碳酸盐岩和天然气水合物为主 ,有少量的硫化物和硫酸盐等。冷泉碳酸盐岩的产状有丘、结核、硬底、烟囱、胶结物和小脉等 ,以化学自养生物碎屑和多期次的自生碳酸盐胶结物组成的生物丘最为常见 ,它在物质来源、形成环境、形成作用等方面与传统来源于海水碳的碳酸盐岩建隆不同 ,用术语Chermoherm表示 ,以区别于传统海水碳酸盐岩建隆术语bioherms、lithoherms、pseudobioherms和biostromes。地层中石化的化学自养生物丘常是含有大量底栖生物化石的碳酸盐岩建隆产于深水相沉积地层中 ,在沉积环境和相分析上出现纵向和横向的不连续 ,甚至出现反常现象。矿物以镁方解石、白云石和文石为主 ,与传统的...

冷泉流体是指来自海底沉积界面之下的低温流体以喷涌和渗漏方式注入盆地 ,并产生系列的物理和化学及生物作用 ,这种作用及产物称为冷泉。它是继洋中脊以盆下源中高温流体的热泉被发现和研究之后的又一个新的盆地流体沉积领域。日前研究较多的是以水、碳氢化合物 (天然气和石油 )、硫化氢、细粒沉积物为主要成分 ,温度与海水相近的流体 ,广泛发育于活动和被动大陆边缘斜坡海底。冷泉流体沉积体系发育高密度的化学自养生物群 ,以碳酸盐岩和天然气水合物为主 ,有少量的硫化物和硫酸盐等。冷泉碳酸盐岩的产状有丘、结核、硬底、烟囱、胶结物和小脉等 ,以化学自养生物碎屑和多期次的自生碳酸盐胶结物组成的生物丘最为常见 ,它在物质来源、形成环境、形成作用等方面与传统来源于海水碳的碳酸盐岩建隆不同 ,用术语Chermoherm表示 ,以区别于传统海水碳酸盐岩建隆术语bioherms、lithoherms、pseudobioherms和biostromes。地层中石化的化学自养生物丘常是含有大量底栖生物化石的碳酸盐岩建隆产于深水相沉积地层中 ,在沉积环境和相分析上出现纵向和横向的不连续 ,甚至出现反常现象。矿物以镁方解石、白云石和文石为主 ,与传统的碳酸盐岩相似 ,在地球化学组成上最大的区别是冷泉流体沉积碳酸盐岩的碳来源于冷泉体系?

 
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