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火山喷发旋回
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  volcanic eruption cycle
     (4)Volcanogenic—sedimentary ore deposits are situated at the top of volcanic eruption cycle;
     ④火山沉积型矿床就位于火山喷发旋回顶部;
短句来源
     are the best rock combinations for mineralization. Copper polymetallic deposits, their distribution and scale were unitedly controlled by the volcanic formation, age and alkalinity,as well as volcanic eruption cycle and paleovolcanic apparatus etc.
     铜多金属矿床的产出及规模受火山岩建造特征、火山岩时代和碱度,以及火山喷发旋回和古火山机构等联合控制。
短句来源
  volcano eruption cycle
     The Middle and Late Silurian Marine Volcano Eruption Cycle and Volcano Action Evolution of Gongpoquan Copper Ore Field, Gangsu Province
     甘肃公婆泉铜矿田中—晚志留世浅海相火山喷发旋回及火山作用演化
短句来源
  volcanic eruption cycles
     Through the research on the Changbaishan Heavenly Lake and regional geological survey data (1∶50 000), the volcanic activities have been divided into four volcanic eruption cycles and thirteen volcanic eruption periods.
     通过对吉林省长白山天池火山的研究及 1∶5万区域地质调查资料 ,将区内新生代上新世以来的火山活动划分为 4个火山喷发旋回及 13个火山喷发期。
短句来源
     On that basis, the stratigraphic successions and regional metamorphic characteristics of the Linzizong volcanic suite are redefined. This suite is subdivided into 8 mambers, belonging to 3 volcanic eruption cycles.
     据此重新论述了西藏林周盆地林子宗火山岩的地层层序及区域变化特征,进一步划分出8个段,属3个火山喷发旋回的产物。
短句来源
  “火山喷发旋回”译为未确定词的双语例句
     Calc-alkaline volcanic rocks of Jiande formation in the northwest of Zhejiang province wereformed by four cycles of volcanic activities and underwent many times of thermal events.
     浙西北晚侏罗世火山岩历经四次火山喷发旋回,经受了多次热事件。
短句来源
     Volcanic activities in this area eam be divided into the Jurassic eruption-sedimentary circle and the Cretaceous eruption-sdeimentary circle, accoedding to the characteristics of rock facies in the basin.
     根据其盆地岩相特征,划分为侏罗世火山喷发旋回和白垩世火山喷发旋回
短句来源
     Liujiang volcanic region in Hebei Province is considered as a volcano-tectonic basin. The characteristics of the volcano-tectonic basin, such as its pattern, scale, geological setting, facies of the volcanic rock and their distribution, volcano - sedimentary cycles, volcanic structures and evolutionary process are studied.
     提出了柳江盆地火山岩区为一个火山—构造盆地的观点.对其火山—构造盆地的形态、规模、地质背景、火山喷发旋回、各旋回火山岩相及分布规律、火山构造、以及其火山—构造盆地的发展演化历史作了较为详细的分析研究.
短句来源
     From early to final cycle, the volcanic rock shows the following regular evolution of rock types: andesite tuff, andesite→dacite, Na rhyolith→quartz trachyte→andesite; element abundance (V, Cr, Mn, Co, Ni, Zr, Sr): high→low→lowest (in the quartz trachyte)→high. These regularities form a more perfect evolutionary cycle.
     火山喷发旋回由早→晚,火山岩岩性由安山质凝灰岩、安山岩→英安岩、钠流纹岩→石英粗面岩→安山岩,火山岩中铁族元素的丰度由高→低→最低(在石英粗面岩中)→高,形成一个较完整的演化周期。
短句来源
     The mesozoic volcanic rocks in Yanji region,Jilin province,are divided into three eruptive cycles according to their lithological features.
     吉林东部延吉地区大面积出露的中生代火山岩,根据岩性特征可分为三个火山喷发旋回
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    The Huainan area is situated in the transitional belt of china's,south-north Sinian system,is one of the critical areas to resolve the correlation of the south-north Sinian syst玬 and to build the true sequence;of upper Precarnbrian system of China.This paper is a tentative summary of the authors careful study on a special subject in 1977-1979 assigned by the state. The paper discusses briefly a series,of new discoveries in this recormais-sance survey,for example,in the south of the North China platform,we were...

    The Huainan area is situated in the transitional belt of china's,south-north Sinian system,is one of the critical areas to resolve the correlation of the south-north Sinian syst玬 and to build the true sequence;of upper Precarnbrian system of China.This paper is a tentative summary of the authors careful study on a special subject in 1977-1979 assigned by the state. The paper discusses briefly a series,of new discoveries in this recormais-sance survey,for example,in the south of the North China platform,we were the first to discover the polyclass microshell fossil bed of early cambrian period,and founded the "Huainan biota" of the late Precambrian period with . ,-chuaridae as its main body;discovered the "Fengtai psephyte" classified into "ice-carrying and facies of clebris fallen" and two "ice-borne sediment cycles";found the bed of the moraine psephyte and the glaciofluvial varve deposit,which is lower than "the Houqiou psephyte" of Sinian period (Original meaning) found the disconformity relationship between the Bagongshan formation and the Liulaobei formation in Feng-Ding area and ascertained there are three volcanic emanation cycles in the underlying metamorphic rock system;determined the age of isotope and determined systematically the micropaleobotanic combination and so on. At the same time,on the basis of theory and practical data,the paper discusses the "Huainan Group" and the "Fengding Group" as well as their dividing,and discusses their age ownership,Puts forward a new theory of China's South-north Sinian system correlation and finds a new plan of China's upper Procambrian system sepuence.

    淮南地处中国南方型和北方型震旦系发育的过渡地带,是解决该两套岩系对比和建立中国上前寒武系真正层序问题的关键地区之一。 本文即是笔者等在原工作的基础上,按照国家所下达的研究任务要求,于1977~1979年深入地开展专题研究工作的初步总结。文内简要地论述了在此次工作中的一系列新的发现,如:在华北准地台南缘,首次地发现了早寒武世多门类小壳化石层位;创建了以Chuaridae为主体的晚前寒武纪“淮南生物群”;在淮南一带发现了“凤台砾岩”中的冰筏落石相沉积和两个冰成沉积旋回;在霍邱一带发现了比原震旦纪“霍邱砾岩”层位更低的冰碛砾岩和冰水纹泥沉积层;在凤定地区发现了八公山组与刘老碑组间的假整合关系,并确定了其下伏浅变质岩中有三次火山喷发旋回;测定了有关岩系的同位素年令和较系统地鉴定了微古植物组合等等。在此基础之上,从理论和系实际资料方面,着重地论证了创建“淮南群”和“凤定群”及其内部划分等问题,并讨论了其时代的归属,进而提出了我国南、北方震旦系对比和建立中国上前寒武系层序的新方案。

    The regional metallogenetic condition of the volcanics in South China depends firstly upon the characteristics of volcanic basins. Accordingly, three types of volcanic basin have been recognized, i.e., Mesozoic superimposed type (Fig. 1) Paleozoic superimposed type (Fig. 2) and explosive type (Fig. 3). Each of them has its own types of mineral deposits (Table 1). The conditions of development of the volcanic cycle controls the ore-bearing degree of the. volcanic basin, and generally speaking, the better developed...

    The regional metallogenetic condition of the volcanics in South China depends firstly upon the characteristics of volcanic basins. Accordingly, three types of volcanic basin have been recognized, i.e., Mesozoic superimposed type (Fig. 1) Paleozoic superimposed type (Fig. 2) and explosive type (Fig. 3). Each of them has its own types of mineral deposits (Table 1). The conditions of development of the volcanic cycle controls the ore-bearing degree of the. volcanic basin, and generally speaking, the better developed volcanic formations are of the better mineralization possibilities (Fig. 4). "The principal lithological (petrological) character"of the basin-the bulk composition of its total volcanics predominates oyer the metallogenic attribute of the basin. When "the principal lithological character"is of intermdiate volcanic rock,the metallogenic attributes of the rocks would be of Fe, V, Au, S, and P; in the case of intermediate-acidic volcanics, the attributes would be of Pb, Zn, Ag, Cu, and Au; and acidic ones, Pb, Zn, W, Mo, and Sn (Table 3). The most favourable ore-forming conditions are provided by the subvolcanic rocks and volcano-intrusive rocks whose principal lithological character is similar to that of the same volcanic basin, and moreover, the best occurrence site for ore bodies is situated at the front position of intrusive rocks (Fig. 6). The fractures, especially the persistently active ones, control not only the formation of volcanic basins and the eruption of volcano, but also metallogenesis. Besides, the derived fractures and two sets of intersecting fractures (Fig. 7) as well as the breccia belt (Fig. 8) are also favourable storage structures for ores. Wall rock alteration may be classified as regional and metallogenic wall rock alterations. The former is only restricted to the alteration of the volcanic rock of the early stage caused by regional volcanic eruption of the late stage, which has nothing to do with ore formation. But the latter is closely connected with metallogenesis, with certain alteration corresponding to certain relevant minerals (Table 5). Moreover, wall rock alteration is of zoning character. The more distinct the zoning of alteration, the better the ores are developed, and the more concentrated the ore bodies are in the intensely altered parts (Fig. 9 and 10).

    本文在对我国东南部中生代火山岩构造环境与区域成矿研究基础上,依据火山活动特点,从火山岩盆地性质;火山喷发旋回发育程度;火山岩盆地的主岩性;火山-侵入岩岩性与产出部位;活动断裂及其次级断裂;火山机构及其周围的构造;围岩蚀变等七个方面,对火山岩盆地的成矿条件进行分析,并指出在普查找矿中应如何正确运用。

    The iron ore belt at Abagong-Mengku area occurs in a metamorphic spilite-quartz keratophyre series.The rock association of the series is a deriva- tive product differentiated after the Na-rich magma fractionation from a con- sanguineous tholeiitic magma which was assimilating during the process of con- tinental crust.The tectonic setting that the series occurs is island arc and active continental margin.The formation of iron ore deposits and occurrences in the iron ore belt is controlled by the Early Devonian...

    The iron ore belt at Abagong-Mengku area occurs in a metamorphic spilite-quartz keratophyre series.The rock association of the series is a deriva- tive product differentiated after the Na-rich magma fractionation from a con- sanguineous tholeiitic magma which was assimilating during the process of con- tinental crust.The tectonic setting that the series occurs is island arc and active continental margin.The formation of iron ore deposits and occurrences in the iron ore belt is controlled by the Early Devonian ocean floor volcanism.To sum up,manifold metallogenesis such as ore magma eruption-injection,eruption-sedi- mentation and volcanic hydrophreatic replacement can be found,and those are not all identical in different iron deposits and occurrences.The later metallogenesis is the most important in Mengku iron deposit and the surrounding deposits and occurrences,and the iron ore bodies so formed and their country rocks show distinct“skarnization”.The analytical result of their trace element abundances,sulfur and oxygen isotopes indicates that such“skarnization”and the iron ore accompaning it are the products mixing with volcanic hydrophreatic liquid and submarine Ca-rich brine and their replacement after the earlier formed volcanic series. The data about their inclusion thermometry and barometry indicate that the temperature and pressure during the formation of rocks and ore is 194—530℃ and 200—1900 bar,respectively.As it is proved that the petrogenesis and ore genesis were proceeded in the large interval of temperature and pressure,thus resulted in multistage nature of the metallogenesis corresponding to the incessant change of temperature and pressure.That the large amount of ferruginous crystal grains exist in melt inclusions and the appearance of CO_2,Cl~-and salt daughter minerals in fluid inclusions reveals that the iron in Abagong deposit stems directly from the ore magma,and majority of iron material in Mengku and the surrounding ore deposits and occurrences stems mainly from the ore-bearing hydrophreatic fractioaated from the volcanic magma.

    本文以板块构造观点概略地论述了本区海相火山岩及铁矿床(点)产出的区域地质背景;根据铷-锶同位素等时线确认了成岩、成矿的时代;通过岩石学、岩石化学、微量元素、矿物气-液包裹体和斜长石的研究,把变质火山岩系恢复为细碧-石英角斑岩系;系统地阐述了变质火山岩岩石学特征,划分了火山喷发旋回,探讨了火山岩产出的地质构造环境以及与铁矿的时空关系;较详细地研究了铁矿带各矿床(点)地层、地质构造、围岩蚀变作用、矿体产态、矿石类型及组构特征。对矿石和磁铁矿的化学组成及微量元素丰度作了较深入地分析;重点研究了硫、氧同位素和流体包裹体类型及特征,论证了矿床的硫源及其与铁矿成因上的关系,成矿流体的来源及其演化的特征,探讨了成矿作用物理化学条件(成矿温度194—530℃,压力200—1900巴)和成矿溶液的性状及包裹体研究在成矿理论分析中的意义。最后对该成矿带各矿床(点)铁质来源、成矿方式、矿床成因类型及成矿系列归属等问题作了较深入的论证和总结。

     
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