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火山活动旋回     
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  volcanic cycle
     DIVISION OF MESOZOIC VOLCANIC CYCLE IN SOUTHEAST AND SOUTHWEST GUANGXI
     广西东南及西南部中生代火山活动旋回划分
短句来源
     According to the study on these volcanic rocks in recent years and the basic principles of division of volcanic cycle which are commomly adopted recently, the Mesozoic volcanisms in these areas are divided into two (upper and lower) volcanic series with four cycles of volcanisms.
     近年来通过对这些火山岩研究,根据目前普遍采用的火山活动旋回划分的基本原则,将该地区中生代火山活动划分出上、下2个火山岩系,4个火山活动旋回
短句来源
     The stratigraphic sequence, volcanic cycle, petrology, geochemistry and geological environment of late Permian basalt along Chenghai fault is studied.
     论述了程海断裂带玄武岩的地层层序、火山活动旋回、岩石学、地球化学、火山系列、活动环境及成矿关系。
短句来源
     The Mesozoic-Cenozoic volcanism is divided into four cycles and defined relevant volcanic mechanism and erupting center and the evolution model of Zhutiantou caldera is set up according to the volcanic cycle and trace of volcanic structure.
     根据火山岩浆作用的旋回性及其产物与火山构造形迹时、空、成因一致性原理,将中、新生代火山岩浆作用分为四个火山活动旋回,圈定了相应的火山机构或火山喷发中心,建立了竹田头复活破火山演化模式。
短句来源
  volcanic activity cycle
     The nonmetallic mineral deposits of early Cretaceous age in easternShandong are clearly controlled by geotectonic, volcanic activity cycle, rock's physical andchemical properties, P-T and aqueous medium conditiones.
     鲁东地区白垩纪早期这些非金属矿的形成,明显受控于大地构造背景、火山活动旋回及岩石物理化学条件、温度压力条件及水介质条件等。
短句来源
     This paper describes the occurrence geological background of volcanic rocks zone, volcanic activity cycle and the composition characteristics of volcanic rocks, and discusses the source of diagenetic material and diaginetic environment.
     本文阐述了浙江寿昌—临浦火山岩带产出的地质背景、火山活动旋回及火山岩类成分特征,探讨了成岩物质来源及成岩环境。
短句来源
  “火山活动旋回”译为未确定词的双语例句
     The higher alkali volcanic lavas are the results of twice cyclic volcanic activities, the grey purple lava dominating in the early cycle and the grey green in the late cycle. The two kinds of lava are similar in mineral aggregate and texture and structure.
     偏碱性火山熔岩为两次火山活动旋回产物,早期火山旋回以灰紫色火山熔岩为主,晚期火山旋回以灰绿色火山熔岩为主,二者在矿物或分、结构构造上均相似。
短句来源
     Based on the study on volcainc-intrusive complex, its occurrence characteristics, petrology andgeochemistry characteristics are discussed as well as division of volcanic sequences and volcaniccycles, classification of volcanic facies and volcanic structure types are suggested.
     通过对火山杂岩体的研究,论述了火山杂岩体产出特点、岩石学及地球化学特征,提出了火山岩层和火山活动旋回的划分、岩根新归属以及火山构造类型。
短句来源
     In geological survery, the rock stratigraphy and mapping units are ascertained by volcanic active cy- cl- tructure-stratigraphy-facies-lithology in the same volcanic mechanism or eruption area.
     进行 1/5万区域地质调查时,采用火山活动旋回-火山构造-火山地层-岩相、岩性-体化思路,按照同旋回火山机构或火山喷发区为单元,确定岩石地层单位和填图单元。
短句来源
     The Zhutiantou revived caldera,Gulai,east Zhejiang,were mapped by volcanic active cycle-volcanic structure-volcanic stratigraphy-rock facies and lithology to get five conclusions:1.This methods is good for geological mapping in volcanic area to get better results;
     系采用火山活动旋回—火山构造—火山地层—岩性、岩相一体化思路对浙东谷来地区的竹田头复活破火山机构进行地质填图的一些认识 ,主要有如下五点 :1 采用火山旋回—火山构造—火山地层—岩性、岩相一体化思路在火山岩区进行地质填图 ,取得了很好的地质效果 ;
短句来源
     This paper divided for the first time the Cenozoic volcanism in the Chifeng area into Oligocene epoch cycle (24-33 Ma), Late Miocene epoch cycle (6-10 Ma), Pliocene epoch cycle (4. 8 Ma), and Pleistocene epoch cycle (0. 89 - 0. 16 Ma).
     本文首次对内蒙古赤峰地区新生代火山活动旋回进行了划分,包括渐新世旋回(24~33 Ma); 中新世晚期旋回(6~10 Ma);
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  volcanic cycle
Mafic end-members of individual volcanic cycle are progressively less siliceous and less enriched in LILE and LREE with height in the stratigraphic section.
      
As a result of extensive two-stage contamination, rhyolites from the initial volcanic cycle incorporate a total of over 60% of crust.
      
This strongly supports a young perturbation event beneath the SLP area and connects the onset of uplift and cooling of the SLP-mantle segment with the back-arc extensional regime of the Quaternary volcanic cycle of the Transmexican Volcanic Belt.
      
The second volcanic cycle, mostly of Pleistocene age (0.5-1.3 m.v.) consists of undersaturated, mainly potassic, alkaline products.
      
The first stage in a volcanic cycle is characterized by high extrusion rates yielding sheet flows, commonly with the thickest flow units at the base.
      
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Okinawa Trough is tectonically a back-arc basin of a trencharc-basin system. The unceasing extension of the basin has caused intensive and repeated volcanic activities in the bottom of the trough. During the volcapic activities of the latest stage large amounts of intermediate or acid pumice were formed, which constitute the main submarine rocks emerged from the bottom of the trough.The pumice in Okinawa Trough is distributed in a NE-SW direction and in an intermittent linear way, which is closely related with...

Okinawa Trough is tectonically a back-arc basin of a trencharc-basin system. The unceasing extension of the basin has caused intensive and repeated volcanic activities in the bottom of the trough. During the volcapic activities of the latest stage large amounts of intermediate or acid pumice were formed, which constitute the main submarine rocks emerged from the bottom of the trough.The pumice in Okinawa Trough is distributed in a NE-SW direction and in an intermittent linear way, which is closely related with the submarine mountains. The pumice encountered on the bottom of the through represents the cognate and isogenetic volcanic eruptive material, i. e., the liparite-pumice that is intermediate and acid yet meta-acid in acidity and belongs under the calc-alkaline series. The submarine eruption is of effusivetype.The pumice is with typical pumiceous structure and porphyritic texture. The phenocryst is usually high-temperature andesine or hypersthene and occasionally quartz. It is character istic of the phenocryst containing relatively more vitric as well as monocyclic and binary enclosures of vitric and gas. The ground mass is acid volcanic glass (N=1.496-1.500). There is a lot of CO_2 in the bubbles. The temperature for crystallization of the phenocryst of high-temperature andesine is 1050-1100%.The pumice contains fine debris enclosures of basalt and andesite, indicating it represents the eruptive material following basal+ and andesite. Judged from the rocks, the pumice falls iu the following rock assemblages tholeiite, andesite-, liparite-andesite-pumice and liparite-pumice.The age of the pumice determined by the method of thermoluminescence is 35400-37100yers, which shows the pumice was formed in the late pleistocene. The pu-mice is arc-volcanic rock.

目前国内外对冲绳海槽槽底火山岩的研究尚处在初级阶段。笔者对槽底八个样点的浮岩进行了系统的矿物岩石学研究。本文首次对酸性浮岩的中、基性火山岩包体进行了研究,揭示了酸性浮岩下部有相当面积的玄武岩及安山岩存在的事实。旨次提出海槽浮岩具有由基性→酸性较完整的火山活动旋回的认识。提出酸性浮岩是基性熔浆演化到后期的产物的观点,从而解释了存在多年的关于冲绳海槽构造问题争议中的焦点问题之一——“冲绳海槽既为弧后盆地,何以有大量酸性火山岩分布”的质疑。提出冲绳海槽浮岩属于岛弧火山岩的观点,对冲绳海槽构造的科学认识起了一定的积极作用。

Circular Mega Volcanic Structure in Kuocangshan experienced at least 24Ma evolution ,showing 4 volcanic activity cycles,more than twenty volcanic edifices and volcanic edifice combinations.

括苍山巨型环形火山构造经历了至少24Ma的演化,形成了四个火山活动旋回,二十多个火山机构及其组合体。火山地质、地球物理和遥感地质信息表明,括苍山巨型环形火山构造从开始到结束一直是个隆起区,其中第Ⅱ旋回结束后的基底隆起形成了南、北两个断块和中间北东东向的仙居张性地堑,晚期(第Ⅲ旋回和第Ⅳ旋回)的火山活动明显受其控制。括苍山主峰的进一步隆起是由于下伏岩基上侵造成的,它使南断块呈一短轴背斜,同时加剧了南断块内第Ⅲ旋回的火山活动,从而造成了这一时期火山活动的南北差异。

There is a set of higher alkali spilite and spilitic breccia lava, several thousand metersthick, found in Late Proterozoic Shenshan group, having a transitionary relationship with the ovrelying lower Sinial flyschiod sedimentary metamorphic rock interbedded with basic volcanic rock. This basic volcanic rock can be compared with the rock series of regional Shenshan group. In this basic rock the basic elements—V, Ti , Cr and Ni are a little higher, but the mineral—forming elements—Cu, Pb and Zn a little lower,...

There is a set of higher alkali spilite and spilitic breccia lava, several thousand metersthick, found in Late Proterozoic Shenshan group, having a transitionary relationship with the ovrelying lower Sinial flyschiod sedimentary metamorphic rock interbedded with basic volcanic rock. This basic volcanic rock can be compared with the rock series of regional Shenshan group. In this basic rock the basic elements—V, Ti , Cr and Ni are a little higher, but the mineral—forming elements—Cu, Pb and Zn a little lower, the total amount of rare earth elements(REE) higher, with the light REE Deing enriched , Ce and La higher and bastnaesite found. The higher alkali volcanic lavas are the results of twice cyclic volcanic activities, the grey purple lava dominating in the early cycle and the grey green in the late cycle. The two kinds of lava are similar in mineral aggregate and texture and structure. The basic lava in Shenshan and the basic rock in overlyins Sinian flyschild formation are the same set of volcanic activity results. The latter is the complement of the former. The metioned above formations are the basement strata of tungsten, copper, gold and uranium deposits. So, the research on the geological background and the evolutionary history of these formations is pragmatically singnificant in looking for the related deposits.

在赣中丰城地区出露一套厚达数千米的晚元古界神山群偏碱性的细碧岩、细碧质角砾熔岩,与上覆震虫系下统类复理石沉积变质岩夹基性火山岩呈渐变关系。该区基性火山岩与区域上的神山群岩系可类比。基性火山岩中基性元素V,Ti,Cr和Ni均偏高,而造矿元素Cu,Pb,Zn含量较低,稀土元素总量较高,为轻稀土富集型,其中以Ce,La较高,见有氟碳铈矿。偏碱性火山熔岩为两次火山活动旋回产物,早期火山旋回以灰紫色火山熔岩为主,晚期火山旋回以灰绿色火山熔岩为主,二者在矿物或分、结构构造上均相似。神山群基性火山熔岩与上覆震旦系类覆理石建造中的基性岩夹层为一套火山活动产物,后者为前者活动的余波。本区的钨、铜、金和铀矿床、矿点均赋存在上述建造为基底地层中。故研究该建造的产出地质背景及其演化历史,对在本区寻找上述矿产有一定的现实意义。

 
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