助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   形成于 在 地质学 分类中 的翻译结果: 查询用时:1.504秒
图标索引 在分类学科中查询
所有学科
地质学
矿业工程
更多类别查询

图标索引 历史查询
 

形成于     
相关语句
  formed in
    The results show that the granulites belong to typical low-pressure granulites formed in an environment of high-temperature and low-pressure (low p/T), with peak temperature being 824±15℃ and corresponding pressure lower than 0.5 GPa. The granulites were cooled during late retrograde reaction which terminated at the temperature of 705℃, with the corresponding pressure near the peak.
    结果表明,本区麻粒岩形成于高温低压(低p/T)环境,属于典型的低压麻粒岩,其峰期变质温度为824±15℃,压力小于0.5GPa,晚期岩石发生了退变冷却,终止温度为705℃左右,压力与峰期时的压力相近;
短句来源
    40Ar/39Ar dating results show that all the Paleogene high magnesian ultrapotassic lavas of western Yunnan are formed in late Eocene (~ 36 Ma). The lavas are enriched in MgO (> 9% ) and K2O (3.07% ~ 7.28% ) with high K2O/Na2O ratios (> 2 in most of the samples).
    40Ar/39Ar同位素定年分析显示滇西新生代高镁富钾火山岩均形成于始新世晚期(约36Ma),富含MgO(>9%)和K2O(3.07%~7.28%),绝大部分K2O/Na2O比值大于2,均属超钾质系列岩石。
短句来源
    T=760 ℃~980 ℃,P=3.50 GPa~4.00 GPa,respectively,and show that that these eclogites have been formed in different metamorphic environments.
    T=760℃~980℃,P=3.50 GPa~4.00 GPa,表明三类榴辉岩形成于不同的变质环境中。
短句来源
    The Bayan Ul Formation-complex formed in the period of 2500-2264 Ma and is considered to be of Paleoproterozoic age.
    巴彦乌拉山岩组形成于2500~2264Ma,属于古元古代。
短句来源
    On the Rb-Hf-Ta and Rb-Y+Nb discrimination diagrams, they plot exclusively into the volcanic arc granitoid (VAG) field, suggesting that they were formed in an active continental margin.
    在Rb-Hf-Ta和Rb-Y+Nb构造判别图解上,桃红岩体和西裘岩体都属于火山弧花岗岩(VAG),形成于活动大陆边缘。
短句来源
更多       
  formed in a
    The deposit was formed in a hydrothermal systemunder a weak acid condition (pH=4-5) and a lower oxygen pressure (logfO_2=- 34- -49). Two major mineralization stages can be observed: ScheeliteStage occured at 300℃ and Molybdenite Stage at 200℃.
    阳储岭W(Mo)矿床形成于弱酸性(pH=4~5)、低氧逸度(logfo_2=-34~49)的热液体系中,具有两个主要的矿化阶段,即白钨矿阶段(300℃)和辉钼矿阶段(200℃)。
短句来源
    The K18 coalbed was formed in a high position forest swamp covered by shallow water on the structure of estuary sediments and it was finally covered by estuary sediments.
    K18煤层是河口湾沉积格架上形成于浅覆水高位森林沼泽之中,最终又被河口湾沉积所覆盖。
短句来源
    Generally, the chert formed in a midoceanic ridge area is rich in Fe_2O_3 and MnO, but very poor in Al_2O_3;
    一般形成于大洋中脊的硅质岩在岩石化学成分上富于Fe_2O_3和MnO,而Al_2O_3含量最低。
短句来源
    Study of isotopic geochronology of mineralization and correlative geological events shows that these gold deposits were formed in a post-collision tectonic environment and four mineralization stages can be distinguished: the early Carbonif-erous(340Ma±) ,middle Carboniferous ( 310Ma± ), late Carboniferous (290Ma±) and early Per-mian(270Ma±).
    成矿作用及相关地质事件同位素年代学研究表明,这4类金矿床形成于后碰撞陆内构造环境,成矿时代分别为早石炭世(340Ma±),中石炭世(310Ma±)、晚石炭世(290Ma±)和早二叠世(270Ma±)。
短句来源
    Researches on mineral inclusions in the Zhen'an-Xunyang lead zinc ore field have indicated that the lead zinc ore deposit formed in a weak moderate reduction environment of meddle low temperature,in which the ore forming media belong to thermal brine fluid of Cl - SO 4 2- F -/K + Na + Ca 2+ (Mg 2+ ) with low salinity and acidity. The genesis of the deposit is mainly sedimentary.
    镇旬铅锌矿田矿物包裹体研究表明 ,本区铅锌矿床最初形成于中—低温、弱—中等还原环境 ,成矿介质属低盐度、酸性条件下的Cl-—SO42 -—F-/K+ —Na+ —Ca2 + (Mg2 + )热卤水流体 ,成因以沉积为主 ;
短句来源
更多       
  is formed in
    Analyses of H,O,C,S,Pb isotope,fracture tectono-geochemistry and ore deposit geochemistry show that the ore deposit is formed in an open system.
    H、O、C、S、Pb同位素资料、断裂构造地球化学与矿床地球化学分析表明矿床形成于开放体系条件。
短句来源
    and that Late Hercynian monzogranitesynogranite associations(290~240 Ma)in Daxing'anling Mt.is formed in late orogenic and postorogenic stretching environments.
    海西晚期的二长花岗岩 正长花岗岩组合(290~240 Ma)形成于晚造山和造山期后的伸展环境。
短句来源
    A forof single zircon U-Pb dating and whole rock isochron of Sm-Nd dating suggested that thePalooproterosoic rock in Chthaysia Bfork is formed in the time span from 2 400 Ma to 2000 Ma,Mesoproterocoic frOIn 1 400 Ma to 1000 Ma and the latest formdfrom 740 Ma to 430 Ma.
    大量的单颗粒钻石年龄和Sin-Nd同位素测年资料显示出华夏地块的古元古代岩石形成于2400~2000Ma,中元古代的岩石形成于1400~1000Ma,而新元古代-早古生代的地层大致形成于740~430Ma。
短句来源
    The low-K (for all rocks),MgO/(MgO+TFeO)=0.834~0.866 and TiO_2 (wt%)=0.02% (for metaperidotite) show the metaperidotite belongs to the type of SSZ ophiolite,In the light of tectonic discrimination diagrams of basalt,the SSZ ophiolite is formed in subduction plate margin of ocean basin.
    变质橄榄岩 MgO/(MgO+TFeO)为0.834~0.866,TiO_2(wt%)为0.02%,为 SSZ 型蛇绿岩的变质橄榄岩。 玄武岩的构造环境判别显示其形成于边缘海盆。
短句来源
    6 Contrast with the regional geology, it is indicated that Yinggezui ophiolitic melange is formed in a back-arc basin setting, which is similar to Erlangping ophiolite.
    6、综合区域对比认为,鹦鸽嘴蛇绿混杂岩与二郎坪蛇绿岩具有相近的产出环境,应形成于弧后盆地构造环境。
短句来源
更多       
  forming in
    Formed in an evaporating lagoon environment having a short connection with sea water and produced a complex deformation by joint action of gravity and structural stress, the plastic body such as salt, gypsum and mud in Neogene in western of Kuche Depression plays a important role in structural pattern, trap type and oil gas reservoir forming in western of the depression.
    库车拗陷西部的下第三系盐、膏、泥等塑性体形成于与海水有短暂沟通的蒸发泻湖环境 ,受重力和构造应力联合作用发生了复杂的变形 ,对拗陷西部的构造样式、圈闭类型、油气成藏的形成产生了重要的影响。
短句来源
    By means of geochemical and geobarometric methods, it is estimated that the depth of emplacement for Jinjiling batholith was about 6.5km, and the rock forming pressure was about 180MPa. Jinjiling composite granitic batholith belongs to S type granitoids, forming in collision orogeny environment.
    采用地质地球化学方法估算出金鸡岭岩基的侵位深度约为 6.3km ,成岩压力为 180MPa ,具中深成相特征 ,属S型花岗岩并形成于华南板块内部的碰撞构造环境。
短句来源
    The two systems formed under special geologic background have different composite shapes of genetic facies and reservoir capabilities in which the sand body in underwater distributary channel and mouth bar,the sand-conglomerate body forming in down-coastal gravi-ty flow deposit,the sand body forming in distal turbidite deposit at the delta front of the retrogrative fan-delta have better capability of reservoir and easily form hydrocarbon traps.
    这两种扇三角洲沉积体系形成于特定的地质背景之下,具有不同的成因相构成型式和储集性能,其中退积型扇三角洲沉积体系前缘、水下分流河道砂体、河口坝砂体、近岸重力流砂砾岩体、远源浊流砂体储集性能良好,易于形成油气圈闭。
短句来源
    Because of forming in the same sedimentary circumstances, the same coal seam have same original substance, same concordant subsequent catagentesis, same or similar characteristic of coal quality and geochemical parameters.
    形成于相同沉积环境中的同一煤层 ,具有大致相同的原始成煤物质和同样的成岩后生变化 ,因而具有相同或相近的煤质特征和元素地球化学组成 .
短句来源

 

查询“形成于”译词为其他词的双语例句

     

    查询“形成于”译词为用户自定义的双语例句

        我想查看译文中含有:的双语例句
    例句
    为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
      formed in
    The results also show that even under these conditions, neither vacuum states nor concentration states can be formed in finite time.
          
    A highly cross-linked structure was formed in both the cores and the shells by using a cross-linking agent, which could prevent the migration of hydrophobic PS shells to the inside of particles.
          
    TEM images revealed that a carbon encapsulated core/shell structure was formed in the composites, which could ensure good dispersion of carbon nanoparticles within the PMMA matrix.
          
    In order to satisfy the need of diagnoses, based on the characteristic of medical images that a sequence of frames are formed in one body inspection, a new strategy for medical images compression is proposed.
          
    With the reduction of the parameter combination, the intergranular phase γ-(Fe, Ni) is formed in the grain boundaries of Ni-Al intermetallic matrix instead of the intergranular phase α-Fe, and large amount of intermetallics are obtained.
          
    更多          
      formed in a
    The geochemistry of chert from the Zhongpu Group reveals that all cherts coexisting with island-arc volcanic rocks formed in a continental margin basin environment.
          
    Research results of the rare earth elements reveal that these cherts formed in a relatively deep-water basin with no significant terrestrial interference.
          
    Based on the aluminum saturation index and QAP plots, the peraluminous granite plot is mostly within the continental collision granite (CCG) field, indicating that the peraluminous granites in Tibet formed in a continental collisional setting.
          
    These particles are formed in a solution and shape a peculiar relief of thin films upon their sticking and sedimentation; this relief is represented by the isolated nanoparticles, submicroscopic grains, and microscopic domains.
          
    Similarity solutions of the equations of a laminar incompressible boundary layer, formed in a rotational external flow, are investigated.
          
    更多          
      is formed in
    With the reduction of the parameter combination, the intergranular phase γ-(Fe, Ni) is formed in the grain boundaries of Ni-Al intermetallic matrix instead of the intergranular phase α-Fe, and large amount of intermetallics are obtained.
          
    Since the minimizing functional is formed in the frequency domain, the algorithm acquires new useful properties, mostly due to the suppression of disturbances through the choice of the working frequency ranges.
          
    It is suggested that an intermediate is formed in the process of thermal denaturation.
          
    It was established that maximal amount of iron-oxygen-containing phases is formed in zinc chloride solution.
          
    The first hydrated layer of a cluster is formed in unsaturated water vapors.
          
    更多          
      forming in
    The spheroidizing heat treatment is normally required prior to the cold forming in GCr15 steel in order to improve its machinability.
          
    Other DNA duplexes (3'-recessed DNA and DNA with the 5'-hydroxyl group in the nick/gap) have no relation to intermediates forming in the course of BER.
          
    The structure of chain aggregates forming in a low-concentration monodisperse ferrocolloid in a uniform permanent magnetic field was studied.
          
    The structure of chain aggregates forming in a low-concentration monodisperse ferrocolloid in a uniform permanent magnetic field was studied.
          
    Determination of the Composition of Strong Molecular Associates Forming in Binary Liquid Systems
          
    更多          


    ~~

    本区地质早已引起许多研究者的注意。在1960——1961年,作者有机会在本区研究了一些剖面,现根据化石资料并结合岩相与构造分析,分本区地层为如下的群与组(自下而上): 1.结晶岩群广泛地分布于本区东北部,其年龄可能为前寒武纪。 2.西汉水群(D_2)又为分三个组(自上而下) 3).杜家河组(类複理石建造) 2).新集子组(碳酸岩建造) 1).麻沿河组(矽质板岩建造) 在杜家河组中曾找到Stringocephalus Obesus Grabau等,在新集子组中找到Atrapa Sp,其时代应属吉维新期(D_2~2),麻沿河组中未发现任何化石,其时代难肯定。 3.大草滩群(D_3)可再分为两个组(自上而下) 2)磨峪沟组由页岩与砂岩组成,含Leptophloeum rhombicum Dawson等。 1)十八盘山组全由纯净石英岩组成。就化石特点来看,上述两组属弗拉斯期(D1/3),在岩性特征上,具有磨拉石特点。 4.木寨岭群本群分布在西汶水群与大草滩群之间,从岩性特点上与相鄰地区比较,知其时代属中石炭世。木寨岭群形成于北秦岭冒地槽迴返后的新凹陷中, 北秦岭冒地槽由此向东即为前寒武纪变质岩系所组成的秦...

    本区地质早已引起许多研究者的注意。在1960——1961年,作者有机会在本区研究了一些剖面,现根据化石资料并结合岩相与构造分析,分本区地层为如下的群与组(自下而上): 1.结晶岩群广泛地分布于本区东北部,其年龄可能为前寒武纪。 2.西汉水群(D_2)又为分三个组(自上而下) 3).杜家河组(类複理石建造) 2).新集子组(碳酸岩建造) 1).麻沿河组(矽质板岩建造) 在杜家河组中曾找到Stringocephalus Obesus Grabau等,在新集子组中找到Atrapa Sp,其时代应属吉维新期(D_2~2),麻沿河组中未发现任何化石,其时代难肯定。 3.大草滩群(D_3)可再分为两个组(自上而下) 2)磨峪沟组由页岩与砂岩组成,含Leptophloeum rhombicum Dawson等。 1)十八盘山组全由纯净石英岩组成。就化石特点来看,上述两组属弗拉斯期(D1/3),在岩性特征上,具有磨拉石特点。 4.木寨岭群本群分布在西汶水群与大草滩群之间,从岩性特点上与相鄰地区比较,知其时代属中石炭世。木寨岭群形成于北秦岭冒地槽迴返后的新凹陷中, 北秦岭冒地槽由此向东即为前寒武纪变质岩系所组成的秦岭地轴所封闭。

    The studied area is located some 70—80 km. northwest of Nanking of the Kiangsu province, This area is composed of complexly folded late pre-Cambrian metamorphics, deeply eroded to a peneplane. The Changbaling formation is of late Sinian age (dated to be 864—1 ,026 m. y. by Uranium-lead methed), and comprises Volcanics of submarine origin and marine sediments, consisting chiefly of a thick series of quartz keratephyres interealated with minor amount of spilites and related volcanic clastics and tufaceous sediments,...

    The studied area is located some 70—80 km. northwest of Nanking of the Kiangsu province, This area is composed of complexly folded late pre-Cambrian metamorphics, deeply eroded to a peneplane. The Changbaling formation is of late Sinian age (dated to be 864—1 ,026 m. y. by Uranium-lead methed), and comprises Volcanics of submarine origin and marine sediments, consisting chiefly of a thick series of quartz keratephyres interealated with minor amount of spilites and related volcanic clastics and tufaceous sediments, accompanied by marine chert beds, dolomitic limestone lenses, siltstones, and shales. The whole series has suffered to a low-grade regional metemorphism, corresponding to the green schists facies. The rocks of the quartz keratophyres possess porphyritic textures and some rhyolitic flow structures. Their principle mineral constituents are albite 55—70%, quartz 29—40%, muscovite (sericite) 3—7%, with minor amount of microcline, and apatite and magnetite as accessories. Microscopically, the rocks possess obvious successive replacement features. Earlier soda-metamorphism forms albite motacrysts, which include residual masses of orthoclase. Later soda-metamorphism (metasomatism) is represented by albito-quartz veinlets, which cut the earlier albite metacrysts, and also form minute polysynthetically twinned albite rims around their borders. Still later comes some microcline which replaces earlier albite along its cleavage planes and grain borders. Last is silicification. Thus, the sequence of metasomatic replacement is: soda-metamorphism → Soda-silica metasomatism → potassium metasomatism → silicification. Corroded quartz phenocrysts contain minute melting inclusions with some devitrification effects, of which, the temperature of homogenization is measured to be 1,030—1180℃. The decrepitation temperature of the liquid inclusions which occur along certain zones in the bordering parts of quartz crystals, is measured to be 300℃. The spilites here occur as intercalated beds in the quartz keratophyre series, and partly they form dikes or some other sub-volcanic forms. Mineralogically, they are composed of albite, epidote, chlorite, magnetite calcite, sodic actinolire, etc. Similarly, the spilites also show obvious features of sodic replacement. Sugary grains of albite cut or replace earlier-formed albite, forming zigzag boudaries around the latter. All the above features indicate that, both the quartz keratophyres and the spilites were formed as a result of successive soda metamorphism (soda replacement). The petro-chemical characters of the quartz keratophyres and the spilites are as shown in the following table: Based upon the petro-chemical properties and the plotting of the data, as Calculated from a large number of rock analyses, according to the various plotting methods, it is brought out that the metamorphosed volcanics of the Changbaling area belong to sub-alkaline volcanic series, being sodic spilite-quartz keratophyre series. The spilites and quartz keratophyres are comagmatic rocks, and their primary magma was probably intermediate to acidic in character. According to the geologic environments for the formation of the associated sedimentary strata, the volcanic rock combination, and their petrologic and petrochemical char acteristics, the writers are inclined to think, that, such a volcanic-sedimentary series with the acidic volcanic components constituting the major part, was probably formed in rather shallow seas near some continental margin, or close to some island arc during the early stage of development, and that, they are different from those spilites or spilite-keratophyre series with the basic componemts constituting the major parts, which represent probably earlier basic volcanic phases deposited in some deep eugeosynclines, or close to some spreading center of ancient sea floor. Of Course, they are also different from the andesiterhyolite series of continental origin. The primary magma here was probably intermediate to acidic in character, which has differentiated into the acidic and basic extremities. During the course or fractional crystallization, the magmas were contaminated by soda from the sea water and the marine sediments, and later the voicanics suffered from soda metamorphism and metasomatism during the time of deep burial and later regional orogenesis and metamorphism. Such is the writers' idea about the origin of the spilite-Quartz keratophyre series here.

    前寒武纪张八岭建造是一套海底喷发的火山岩系,其原岩由大量石英角斑岩和少数细碧岩及其火山碎屑岩、凝灰质沉积岩组成,并与海相的硅质岩、白云质石灰岩透镜体、粉砂岩、页岩等伴生。受区域变质作用影响,形成绿片岩相的矿物组合。岩石具典型的熔岩组构。主要矿物成分为:石英、低温完全有序的钠长石(An<5)和绿泥石、绿帘石、磁铁矿等。岩石有明显的交代观象,其交代顺序为:钠化→钠硅化→钾化→硅化。据玻璃质固化包裹体测温,其岩浆温度为1030—1180℃;液相包裹体测温,其热液蚀雯温度为300℃。由岩石化学分析资料说明:变质火山岩为弱碱质钠质细碧岩——石英角斑岩系。两者为同源岩浆岩。其原始岩浆成分为——中酸性岩浆。经分异作用,主要向酸性岩浆转化;少量向基性。在岩浆结晶分异的同时并遭受海水及海相沉积物中钠质的混染,成为富钠质的岩浆,逐渐演变成富钠的透岩浆溶液,发生钠质交代,这种作用继续延到岩浆期后的热液期。其后岩石又经低级区域变质作用,形成石英角斑岩及细碧岩。根据变质火山岩的岩石学、岩石化学及火山岩中伴生岩石特征等地质因素,说明:它形成于浅海环境,靠大陆边沿,或岛弧。它是以酸性火山岩为主的,细碧岩——石英角斑岩系,与产于...

    前寒武纪张八岭建造是一套海底喷发的火山岩系,其原岩由大量石英角斑岩和少数细碧岩及其火山碎屑岩、凝灰质沉积岩组成,并与海相的硅质岩、白云质石灰岩透镜体、粉砂岩、页岩等伴生。受区域变质作用影响,形成绿片岩相的矿物组合。岩石具典型的熔岩组构。主要矿物成分为:石英、低温完全有序的钠长石(An<5)和绿泥石、绿帘石、磁铁矿等。岩石有明显的交代观象,其交代顺序为:钠化→钠硅化→钾化→硅化。据玻璃质固化包裹体测温,其岩浆温度为1030—1180℃;液相包裹体测温,其热液蚀雯温度为300℃。由岩石化学分析资料说明:变质火山岩为弱碱质钠质细碧岩——石英角斑岩系。两者为同源岩浆岩。其原始岩浆成分为——中酸性岩浆。经分异作用,主要向酸性岩浆转化;少量向基性。在岩浆结晶分异的同时并遭受海水及海相沉积物中钠质的混染,成为富钠质的岩浆,逐渐演变成富钠的透岩浆溶液,发生钠质交代,这种作用继续延到岩浆期后的热液期。其后岩石又经低级区域变质作用,形成石英角斑岩及细碧岩。根据变质火山岩的岩石学、岩石化学及火山岩中伴生岩石特征等地质因素,说明:它形成于浅海环境,靠大陆边沿,或岛弧。它是以酸性火山岩为主的,细碧岩——石英角斑岩系,与产于优地槽(或大洋扩张部位)发展早期的蛇绿岩套;包括基性、超基性岩。硅质岩及以基性组分为主的细碧岩——角斑岩建造是迥然不同的。它与岛弧晚期阶段的陆相安山岩——流纹岩也有一定的差别,可能是岛弧早期的产物。

    The studied area is located some 70—80 km.northwest of Nanking of the Kiangsu province.This area is composed of complexly folded late pre-Cambrian metamorphics,deeply eroded to a peneplane.The Changbaling formation is of late Sinian age(dated to be 864—1,026 m.y.by Uranium-lead method),and comprises volcanics of submarine origin and marine sediments,consisting chiefly of a thick series of quartz keratephyres interealated with minor amount of spilites and related volcanic clastics and tufaceous sediments.accompanied...

    The studied area is located some 70—80 km.northwest of Nanking of the Kiangsu province.This area is composed of complexly folded late pre-Cambrian metamorphics,deeply eroded to a peneplane.The Changbaling formation is of late Sinian age(dated to be 864—1,026 m.y.by Uranium-lead method),and comprises volcanics of submarine origin and marine sediments,consisting chiefly of a thick series of quartz keratephyres interealated with minor amount of spilites and related volcanic clastics and tufaceous sediments.accompanied by marine chert beds,dolomitic limestone lenses,siltstones,and shales.The whole series has suffered to a low-grade regional metemorphism,corresponding to the green schists facies. The rocks of the quartz keratophyres possess porphyritic textures and some rhyolitic flow structures.Their principle mineral constituents are albite 55—70%, quartz 20—40%,muscovite(sericite)3—7%,with minor amount of microcline, and apatite and magnetite as accessories. Microscopi(?)ally,the rocks possess obvious successive replacement features. Earlier soda-metamorphism forms albite motacrysts,which include residual mas- ses of orthoclase.Later soda-metamorphism(metasomatism)is represented by albito-quartz veinlets,which cut the earlier albite metacrysts,and also form minute polysynthetically twinned albite rims around their borders.Still later comes some microcline which replaces earlier albite along its cleavage planes and grain borders.Last is silicification.Thus,the sequence of metasomatic repla- cement is:soda-metamorphism→Soda-silica metasomatism→potassium metaso- matism→silicification. Corroded quartz phenocrysts contain minute melting inclusions with some devitrification effects,of which,the temperature of homogenization is measured to be 1,030—1180℃.The decrepitation temperature of the liquid inclusions which occur along certain zones in the bordering parts of quartz crystals,is measured to be 300℃. The spilites here occur as intercalated beds in the quartz keratophyre series, and partly they form dikes or some other sub-volcanic forms.MineralogicaUy, they are composed of albite,epidote,chlorite,magnetite calcite,sodic actinol- ire,etc.Similarly,the spilites also show obvious features of sodie replacement. Sugary grains of albite cut or replace earlier-formed albite,forming zigzag bou- daries around the latter.All the above features indicate that,both the quartz keratophyres and the spilites were formed as a result of successive soda meta- morphism(soda replacement). The petro-chemical characters of the quartz keratophyres and the spilites are as shown in the following table: oxides% rock types SiO_2 K_2O+Na_2O Na2_O K_2O CaO MgO FeO+Fe_2O_3 quartz keratephyres >70(71—78) (?)5—8 >5 1.5± 0.45 0.37 2.13 spilite >40(41—55) >6(4—8) ≈5 0.5± 4.13 3.46 15.65 Based upon the petro-chemical properties and the plotting of the data,as Calculated from a large number of rock analyses,according to the various plot- ting methods,it is brought out that the metamorphosed volcanics of the Chang- baling area belong to sub-alkaline volcanic series,being sodic spilite-quartz ke- ratophyre series.The spilites and quartz keratophyres are comagmatic rocks,and their primary magma was probably intermediate to acidic in character.Accord- ing to the geologic environments for the formation of the associated sedimentary strata,the volcanic rock combination,and their petrologic and petrochemical char acteristics,the writers are inclined to think,that,such a volcanic-sedimentary series with the acidic volcanic components constituting the major part,was prob- ably formed in rather shallow seas near some continental margin,or close to some island arc during the early stage of development,and that,they are dif- ferent from those spilites or spilite-keratophyre series with the basic compo- nemts constituting the major parts,which represent probably earlier basic vol- canic phases deposited in some deep eugeosynclines,or close to some spreading center of ancient sea floor.Of Course,they are also different from the andesite- rhyolite series of continental origin.The primary magma here was probably inter- mediate to acidic in character,which has differentiated into the acidic and basic extremities.During the course or fractional crystallization,the magmas were contaminated by soda from the sea water and the marine sediments,and later the volcanics suffered from soda metamorphism and metasomatism during the time of deep burial and later regional orogenesis and metamorphism.Such is the writers' idea about the origin of the spilite-Quartz keratophyre series here.

    前寒武纪张八岭建造是一套海底喷发的火山岩系,其原岩由大量石英角斑岩和少数细碧岩及其火山碎屑岩、凝灰质沉积岩组成,并与海相的硅质岩、白云质石灰岩透镜体、粉砂岩、页岩等伴生。受区域变质作用影响,形成绿片岩相的矿物组合。岩石具典型的熔岩组构。主要矿物成分为:石英、低温完金有序的钠长石(An<5)和绿泥石、绿帘石、磁铁矿等。岩石有明显的交代观象,其交代顺序为:钠化→钠硅化→钾化→硅化。据玻璃质固化包裹体测温,其岩浆温度为1030—1180℃;液相包裹体测温,其热液蚀变温度为300℃。由岩石化学分析资料说明:变质火山岩为弱碱质钠质细碧岩——石英角斑岩系。两者为同源岩浆岩。其原始岩浆成分为——中酸性岩浆。经分异作用,主要向酸性岩浆转化;少量向基性。在岩浆结晶分异的同时并遭受海水及海相沉枳物中钠质的混染,成为富钠质的岩浆,逐渐演变成富钠的透岩浆溶液,发生钠质交代,这种作用继续延到岩浆期后的热液期。其后岩石又经低级区域变质作用,形成石英角斑岩及细碧岩。根据变质火山岩的岩石学、岩石化学及火山岩中伴生岩石特征等地质,因素,说明:它形成于浅海环境,靠大陆边沿,或岛弧。它是以酸性火山岩为主的,细碧岩——石英角斑岩系,与产...

    前寒武纪张八岭建造是一套海底喷发的火山岩系,其原岩由大量石英角斑岩和少数细碧岩及其火山碎屑岩、凝灰质沉积岩组成,并与海相的硅质岩、白云质石灰岩透镜体、粉砂岩、页岩等伴生。受区域变质作用影响,形成绿片岩相的矿物组合。岩石具典型的熔岩组构。主要矿物成分为:石英、低温完金有序的钠长石(An<5)和绿泥石、绿帘石、磁铁矿等。岩石有明显的交代观象,其交代顺序为:钠化→钠硅化→钾化→硅化。据玻璃质固化包裹体测温,其岩浆温度为1030—1180℃;液相包裹体测温,其热液蚀变温度为300℃。由岩石化学分析资料说明:变质火山岩为弱碱质钠质细碧岩——石英角斑岩系。两者为同源岩浆岩。其原始岩浆成分为——中酸性岩浆。经分异作用,主要向酸性岩浆转化;少量向基性。在岩浆结晶分异的同时并遭受海水及海相沉枳物中钠质的混染,成为富钠质的岩浆,逐渐演变成富钠的透岩浆溶液,发生钠质交代,这种作用继续延到岩浆期后的热液期。其后岩石又经低级区域变质作用,形成石英角斑岩及细碧岩。根据变质火山岩的岩石学、岩石化学及火山岩中伴生岩石特征等地质,因素,说明:它形成于浅海环境,靠大陆边沿,或岛弧。它是以酸性火山岩为主的,细碧岩——石英角斑岩系,与产于优地槽(或大洋扩张部位)发展早期的蛇绿岩套;包括基性,超基性岩,硅质岩及以基性组分为主的细碧岩——角斑岩建造是迥然不同的。它与岛弧晚期阶段的陆相安山岩——流纹岩也有一定的差别,可能是岛弧早期的产物。

     
    << 更多相关文摘    
    图标索引 相关查询

     


     
    CNKI小工具
    在英文学术搜索中查有关形成于的内容
    在知识搜索中查有关形成于的内容
    在数字搜索中查有关形成于的内容
    在概念知识元中查有关形成于的内容
    在学术趋势中查有关形成于的内容
     
     

    CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
    版权图标  2008 CNKI-中国知网
    京ICP证040431号 互联网出版许可证 新出网证(京)字008号
    北京市公安局海淀分局 备案号:110 1081725
    版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社