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intrusive
相关语句
  侵入
     The nitrogen content in intrusive rock inclusions is higher, 25. 39-731. 30 μL/g, and δ15N ranges from +0. 7‰ to + 20. 9‰.
     侵入岩包裹体中氮含量为25.39~731.30μL/g,δ~(15)N为+0.7‰~+20.9‰。
短句来源
     The 40Ar/39Ar plateau ages of hornblendes from syenodiorite in Taershan intrusive, Linfen City, Shanxi Province, from appinites in Xianli intrusive, Changzhi City, Shanxi Province and in Dongye intrusive, Anyang City, Henan Province, are (124.9±0.3) Ma, (127.7±0.3) Ma and (127.1±0.1) Ma, respectively.
     山西临汾塔儿山正长闪长斑岩、山西长治西安里岩体和河南安阳东冶岩体富闪侵入岩中角闪石的40Ar/39Ar坪年龄分别为(124.9±0.3)Ma,(127.7±0.3)Ma和(127.1±0.1)Ma;
短句来源
     The 206Pb/204Pb values of 6 samples of sulfides of the gold ore, 1 sample of meta-sedimentary rocks and 2 samples of volcanic rocks from the strata and 5 samples of intrusive bodies (or dykes) are 17. 034~ 17. 725, 16.971, 17. 602 - 17. 513 and 17.492 - 17.776, respectively;
     6件金矿石中的硫化物、1件变质沉积岩、2件地层火山岩+5件侵入岩体(脉)的~(206)Pb/~(204)Pb值分别为17.034~17.725、16.971、17.602~17.513和17.492~17.776;
短句来源
     This kind of intrusive rocks have similar ratios of trace elements (Th/ U, Zr/Hf, Nb/Ta).
     该类侵入岩具有接近的微量元素Th/U、Zr/Hf、Nb/Ta值。
短句来源
     These age data are concordant with ~(40)Ar/~(39)Ar ages, 135.8~139.8 Ma, of the ore-forming intermediate-acid intrusive rocks.
     这组年龄数据和与成矿有关中酸性侵入岩的40Ar/39Ar同位素年龄135.8~139.8Ma相吻合。
短句来源
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  侵入体
     ATTEMPT TO DECIDE DENUDATION DEGREE OF INTRUSIVE MASSES WITH (Nb+Zr+Rb)/(V+CO+Ni) RATIO
     用(Nb+Zr+Rb)/(V+Co+Ni)值判断侵入体剥蚀程度的尝试
短句来源
     (3 ) Phanerozoic flood basalt- equivalent intrusive type deposits associated with continental rift, such as Noril 'sk, Oktyabri'skiy, Talnakh, Tamyr deposits;
     (3)显生宙与大陆裂谷有关的相当于溢流玄武岩的侵入体矿床,如诺里尔斯克(Noril’sk)、十月(Oktyabri’skiy)、塔尔纳赫(Talnakh)、太梅尔(Tamyr)等;
短句来源
     The granodiorite in the lower-plate intrusive body intruded 171~164 Ma ago, the deformation ages of muscovite and metamorphic rhyolitic were 142 Ma and 155 Ma respectively, and the ~ 40 Ar-~ 39 Ar age of the mylonite in northern boundary fault was 154.9±0.6 Ma, which indicated that the lower-plate intrusive body occurred in Middle Jurassic, and the metamorphic core complex uplifted in Late Jurassic.
     中央侵入体花岗闪长岩的结晶年龄为171~164Ma,变质的白云母和流纹质糜棱岩的变形年龄分别为142Ma和155Ma,北部边界断裂带糜棱岩的40Ar-39Ar年龄为154.9±0.6Ma。
短句来源
     the ore fluids of gold deposits occurred in Paleozoic greenstone formation was meteoric water heated by granitic intrusive mass, which δD was very low.
     古生代绿岩建造金矿床的成矿流体为被花岗岩侵入体加热的大气降水,以δD特别低为特征。
短句来源
     The age of intrusive masses ranges from 135.3 Ma to 302 Ma. With a predominant interval of 135—186 Ma, which corresponds to Early Yenshanian Stage. Granitic rocks of Late Yenshanian Stage are fewer.
     侵入体同位素年龄值为135.3—302Ma,为多期侵入,主要为燕山早期(135.3—186.3Ma),少数为燕山晚期。
短句来源
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  侵入的
     Yunmengshan granitic batholith consists of 12 intrusive bodies. The foliated granites in the batholith are I-type granite which intruded at 126 (±21)Ma.
     云蒙山花岗岩基由12个侵入体组成,岩基中的片麻状花岗岩是在126±21Ma时侵入的Ⅰ型花岗岩。
短句来源
     The main host wall rock is granite which intrusive era is r52-1a.
     主要赋矿围岩为燕山早期第一阶段第一次侵入的花岗岩(r_5~(2-1a))。
短句来源
     The single-zircon U-Pb dating of the rhyodacite shows that the age of the rhydacite is 129.54±7.93 Ma, younger than the age of clastoporphritic lava which is the principal part of Xiangshan volcanic-intrusive complex. Combined with the modes of occurrence and shape characteristics of the rhyodacite, this paper holds that rhyodacite is a post-volcanic shallow or ultrashallow intrusive body, i.e., rhyodacitic porphyry.
     应用单颗粒锆石U-Pb法,对相山“流纹英安岩”进行了测年,获得其年龄为129.54±7.93Ma,该年龄小于相山火山-侵入杂岩的主体岩石——碎斑熔岩的年龄,结合其产状形态特征,认为“流纹英安岩”属火山期后浅成-超浅成侵入的流纹英安斑岩。
短句来源
     After enclosing harnessing of moving dune,the first intrusive plant is Agriopyllum arenarium. After 3~5 years,the growth is weaken.
     流动沙丘围封治理以后,最初侵入的植物是沙蓬,3~5 a后,生长开始衰弱。
短句来源
     The first phase intrusive syenodiorite is the major parent rock for the iron deposits in the area.
     在四个侵入阶段中,第一阶段侵入的正长闪长岩是该区铁矿最主要的成矿母岩.
短句来源
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  “intrusive”译为未确定词的双语例句
     Results:Chronic insomniacs employed more 'worry' thought control strategies to cope with intrusive thoughts than normal sleepers (10.7±2.6/8.5±2.9,t=5.08,P<0.01; 11.6±2.8/9.0±3.1,t=5.43,P<0.01).
     结果:1.慢性失眠症患者担心的思维控制方式得分高于睡眠正常组(10.7±2.6/8.5±2.9,t=5.08,P<0.01); 惩罚的思维控制方式得分高于睡眠正常组(11.6±2.8/9.0±3.1,t=5.43,P<0.01);
短句来源
     The determination of rocks of different intrusive periods suggests that the average Au content of the first, second, third period rocks and vein rock syenite are 8.8×10 -9 , 5.1×10 -9 , 7.4 ×10 -9 and 4.2×10 -9 , respectively.
     第1期岩石平均金含量为8.8×10-9,第2期岩石为5.1×10-9,第3期岩石为7.4×10-9,正长岩为4.2×10-9。
短句来源
     The 40Ar/39Ar plateau ages of biotites from pyroxene diorite in Tietonggou intrusive and from granodioritic porphyry in Hutouya intrusive, western Shandong are (132.8±0.3) Ma and (124.4±0.3) Ma, respectively.
     鲁西莱芜铁铜沟辉石闪长岩和蒙阴虎头崖花岗闪长斑岩中黑云母的40Ar/39Ar坪年龄分别为(132.8±0.3)Ma和(124.4±0.3)Ma;
短句来源
     The 40Ar/39Ar plateau age of hornblende from granodiorite in Guandian intrusive, northern Anhui Province is (126.9±0.2) Ma.
     皖北管店花岗闪长斑岩中角闪石的40Ar/39Ar坪年龄为(126.9±0.2)Ma。
短句来源
     The three subzones of alkali-ric h intrusive rocks belong to the same category of the high-K, ALK=10~15, K 2O=5 %~15%, K 2O/Na 2O=1.26~8.30.
     三个亚带富碱岩浆在化学成分方面虽有差异 ,但共同具有富碱高钾特征 ,AL K=10~ 15 ,K2 O含量范围 5 %~ 15 % ,K2 O/ Na2 O=1.2 6~ 8.30。
短句来源
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  intrusive
Dynamically Equilibrium Shape of Intrusive Vortex Formations in the Ocean
      
Initiation and coordinated and intrusive growth are considered, as well as formation of secondary cell wall, including its gelatinous layers, and senescence.
      
Plant fiber intrusive growth characterized by NMR method
      
Diffusion echo decay was measured for stem regions of long-fiber flax (Linum usitatissimum L.) differing in the stages of primary fiber development, which elongate thousand-fold during intrusive growth.
      
An increase in the slow component of the echo diffusion decay was correlated with an increase in the number of fibers on the stem cross-section in the zone of intrusive growth, while other stem-structure characteristics remained unchanged.
      
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Various kinds of acid igneous rocks are found around the Kushan, to theeast of Foochow, Fukien. One earlier variety of the granites, provisionally termedas Kushan Granite, is coarser-grained, often flesh-colored, and biotite-bearing,similar in character to the most frequently seen and widely distributed graniteof whole Fukien; the other, the Kueichi Granite, often intruding into the firstnamed, is colored by different shades of grey, mostly, fine-grained, and mia-rolitie, containing minor amount of hornblende...

Various kinds of acid igneous rocks are found around the Kushan, to theeast of Foochow, Fukien. One earlier variety of the granites, provisionally termedas Kushan Granite, is coarser-grained, often flesh-colored, and biotite-bearing,similar in character to the most frequently seen and widely distributed graniteof whole Fukien; the other, the Kueichi Granite, often intruding into the firstnamed, is colored by different shades of grey, mostly, fine-grained, and mia-rolitie, containing minor amount of hornblende instead of biotite, yet sometimesvarying its texture to felsitic, porphyritic, or even to micro-graphic. In thecourse of weathering, the soils thus formed from these two granites, as well astheir corresponding surface vegetations are also evidently dissimilar. That the Kueichi granite was really intruding into the Kushan is evidencedby its ramifying apophyses in the latter, its broad marginal phase, its miaro- litie cavities elongated and lined parallel to the intrusive contact and the"sericitization front", so to show a convex curvature facing the Kushan Graniteside along their mutual contact. The prevalent strike of the contact of the granites conicides with thefracture and joint systems of the Kushan Granite, one set of which is N65°E,being also parallel to one of the major vertical joints of the Kueichi. This isprobably due to the prolonged fracturing during the formation of Pacificfolding zones of the Chekiang and Fukien coast, rendering the KueichiGranite intruding along the said fracture system yet itself subjected to the samemechanical stress. Rocks correlated to these two granites are found elsewhere in Fukien. Theymay also be comparable to the two granites of Sihwashan, S. Kiangsi, foundby C. S. Mo and his colleagues. The repeated intrusions of the Post-Jurassicgranites may allow to consider the possibility of repeated formations of theirgenetically related ores. The lead-zinc deposits of Yuntai and Lungyai areprobably related to the igneous activity of the Kueichi Granite.

经初步瞭解,福建鼓山分布着两种后侏罗纪花岗岩。这从岩石地面分布上的接触情况与显微镜下观察的岩石中组成成分的接触情况两方面得到证实的。从二者产生状态看来,彼此生成时间甚为接近,而同属於太平洋运动产物,分属早晚期活动。再根据前人各种地质文件,推论出福建各地普遍存在着相当於这两种侵入的花岗岩类岩石。因此,联系到福建后侏罗纪金属矿成矿作用的多次性可能。这在江西西华山已有发现。此后从多次性来研究后侏罗纪的炎成矿床的成矿作用,成为必要了。

Ⅰ. The Yinshan district as an example of "activizing region" in the Chinese platform One of the most typical localities that show clearly the phenomenon of"activization of platform" (активи. зация платформы) is the Yinshan region, aneast western mountain range on the border between the North-China plain andthe Mongolian plateau. It has long been recognized as a platform because ofthe presence of a folded foundation Pre-Sinian in age. However, owing to thefacts that Mesozoic crustal movements and magmatic activities...

Ⅰ. The Yinshan district as an example of "activizing region" in the Chinese platform One of the most typical localities that show clearly the phenomenon of"activization of platform" (активи. зация платформы) is the Yinshan region, aneast western mountain range on the border between the North-China plain andthe Mongolian plateau. It has long been recognized as a platform because ofthe presence of a folded foundation Pre-Sinian in age. However, owing to thefacts that Mesozoic crustal movements and magmatic activities are importantwithin this area, some geologists including G Schoenmann, hold that it is ageosynclinal region. It is Ю. М Шейманн who first noticed the phenomenon of activizationappearing in the Chinese platform. В. М. Синицын in his "Строенив и развитиекитайской платформы" indicates that some of the mountain ranges includingYinshan, which have been formerly referred to the folding belts developingfrom geosynclines, are in fact the internal structures of the Chinese platform. In this paper the writer after the opinion of В. М. Синицын, assigns theYinshan area as one of the "activizing regions" in the Chinese platform, andgives more detailed descriptions and discussions mainly on the point of thehistory of its stratigraphic development. Really it is a fact that the Yinshan region has an old folded foundationwhich is composed of metamorphic complex including chiefly gneisses, schists,and old granitic intrusions apparently Pre-Sinian in age. Since the formationof this folded foundation during the Luliang movement (=Goto-Karelian mo-vement), the old land of the Yinshan region has "activized" or "resurrected"several times. As early as in the Sinian period, a depression prolonging in E-Wdirection happened on its southern border, where Sinian limestone 900 metresin thickness and in some places up to 9,620 metres was so deposited. During a long time of the Palaeozoic era, the Yinshan old land was in the poriod ofdenudation except some Cambrian marine limestones only 144 metres in thick-ness deposited in the western part. At the end of the Palaeozoic era, local acti-vization with the formation of continental basin-deposits of Permian age, up to1,380 metres in thickness, as found in the Tachingshan area again happened.In the middle Mesozoic era, the Yinshan region came to a period of strongactivity. Structural depressions duo to "Процесс аркогенеза" occurred universallywithin the whole area and magmatie activities in large magnitude associatedthis crustal movement, so that a great sequence of freshwater basin-depositswith intercalations of volcanic beds, up to 8,000 metres in total thickness wereformed. During the formation of these strata, especially at the end of Mesozoic,interruptions of depositon happened frequently, folds and thrusts were abund-antly formed, and intrusive bodies of "young granite" were produced hereand there. In the Tertiary period, the Yinshan region was violently faulted, andvolcanic activities still happened, producing the basalt lava flow spreading ina wide area. The activity of the Yinshan old land has not ceased even to-dayas shown by the facte that its whole area is in the process of uplift and by thepresence of an earthquake zone known in the historical time. Ⅱ. To what Geotectonic Unit does the Southeastern Coastal Region of China Belong? On the Southeastern coast of China there is a district where geotectoniccharacteristics have never been recognized clearly. It is A. W. Grabau who firstreferred it to an old land named "Cathaysia". J. S. Lee holds the same opinion.In his geotectonic map of China, B. M. Синицын also assigns this region to aplatform and marks it as a part of his "Южно-китайский платформенный массив".However, there is still another opinion opposed to this. A. C. Хоминтовский, forinstance, renders recently this district to a geosynclinal region and proposes thename "Minche Pacific folding zone" for it. H. T. Yang and T. Y. Yu agreewith him. In the year 1954, the writer in his compilation-work connected with thegeology of Fukien and Kwangtung, found that the geotectonic characteristics ofthe southeastern coastal region of China are not only unagreeable with thosefound in a common platform on the one hand, but also contrasting, with thoseof a geosynclinal region on the other. In fact, it cannot be referred suitably toany geotectonic unit except to the intermediate type as shown by the history ofits geological development. Apparently it is an "activizing" or "resurrected" platform. During the Pre-Sinian crustal movement (the Luliang movement), a foldedfoundation composed of old gneisses, schists, and phyllites was completely for-med. Obviously this is a part of the broad old land of Southern China. In the earlier stage of the Palaeozoic era, the whole area of this region wasexposed in the air and under denudation. Hence, no deposit of any kind wasformed. After the Caledonian movement, depressions happened in the western partof this region, where the Devonian-Lower carboniferous continental deposit, theNanching series consisting mainly of quartzite, conglomerate and shale has beenformed, but the other parts were still under denudation. These facts show thatthis region was still a land at that time. Uralian and Lower Permian limestones, known respectively as the Chuan-shan limestone and the Chihsia limestone, separated from each other by adisconformity, spread widely in this region. This indicates that the marine trans-gressions really happened in the southeastern coastal region of China. However,the thicknesses of these limestones (only 30 metres and 150 metres respectively)and their uniformity in the horizontal direction show that the sea at thosetimes was shallow, and the magnitude of subsidence of the earth crust withinthis region was small. The unnoticed lateral changing of lithological charactersof these limestones proves the same fact. Undoubtedly these limestones arenothing but the marine deposits of platform-type. From Upper Permian toTriassic, this region was under a condition of alternation of transgression andregression of the sea. Owing to the fact that the amplitude of oscillation of theearth crust of this region at that time was small, the deposits formed duringthe marine transgression were thin and interrupted again and again by disconfor-mities (or even unconformities). Sometimes continental deposits are intercalated. Since the later period of Triassic, the southeastern coastal region has neverbeen covered by the sea again. And, a new condition began to happen in LowerJurassic. Here, the old land became to "resurrected", so that a series of depres-sing belts were formed as a result of "Процесс аркогенеза". In association withthe subsidence of these depressions, continental beds with a total thicknessup to 3,000 metres were deposited. In the beds interruptions frequently occurred.Folds were abundants, although they or at least some of them were intermediatetype. At the same time, magmatic activities were significant. Itappearedfirstly in the form of volcanic eruptions as recorded by a great sequence of beds consisting of tuff and rhyolite intercalating in the continental bedsmentioned above. And then, at the end of the Mesozoic, numerous graniticbodies were produced. Coming to the Cenozoic era, this region still sufferedfrom rather strong crustal movements accompanied by basalt lava eruptions. Theactivity of the old land has not yet been ceased even to-day as marked by thepresence of a famous earthquake zone between Kwangtung and Fukien, and theabundance of hot springs which widely spread within this region. All theseshow the typical characters of an "activizing" or "resurrected" platform. Final-ly, the complexity of the types of mineral deposits found in Fukien and Kwang-tung also proves the geotectonic nature of this region. Summarizing the whole matter, we may say that the southeastern coastalregion of China was originally an old land. Although it has been agian andagain submerged by the sea, the resulting marine deposits are entirely differentfrom those of geosynclinal region. In the middle of Mesozoic, this region beganto be active violently again, producing a series of depressions or "secondarygeosynclines", in which thick continental beds were deposited, and, at the sametime, folds of intermediate type, serious volcanic eruptions and magmatic intru-sions were produced. Hence, to refer the southeastern coastal region of China toan "activizing" platform is quite strongly proved. The northwestern boundary of this "activizing" platform is generally onthe line starting from central Chekiang through central Kiangsi to the Sou-thwestern part of Kwangtung, because the history and characteristics of geolo-gical development of the Southeastern Kiangsi and Central-southern Kwangtungare quite similar to those of Fukien and Eastern Kwangtung. As to the nomination of this geotectonic unit, the writer proposes to callit "Cathaysian activizing region". This name is derived from the "Cathaysia"of A. W. Grabau but adds, according to necessity, the meaning of activizing or"resurrected" characters of this region. The so-called "Minche Pacific foldingzone" of A. C. Хоминтовский is obviously unacceptable because it entirely doesnot coincide with fact. Compared with the "aetivizing" platforms found in other parts of theworld, the Cathaysian coastal "activizing" platform has its own characteristics,especially shown by the presence of numerous, widely spread, small depressionsor "secondary geosynclines", and the acidic magmatic activities appearing on alarge scale. All these indicate that this is a special type differing from all theknown "activizing" plat

~~

In order to facilitate the investigation of plate tectonic on the continent, the writer proposes some principles for references. They are: 1, the juncture between two plates is always represented by a great fault or fracture zone extending for at least several hundreds or usually more than one thousand kilometers long; 2, the sharp diversities of depositional phases and faunas on the adjacent plates; 3, the presence of melanges; 4, the presence of ophiolite zone; 5, the presence of blueschists; 6, the dis-tribution...

In order to facilitate the investigation of plate tectonic on the continent, the writer proposes some principles for references. They are: 1, the juncture between two plates is always represented by a great fault or fracture zone extending for at least several hundreds or usually more than one thousand kilometers long; 2, the sharp diversities of depositional phases and faunas on the adjacent plates; 3, the presence of melanges; 4, the presence of ophiolite zone; 5, the presence of blueschists; 6, the dis-tribution with some regularities of intrusive and extrusive rocks; 7, the distribution of earthquake epicenters; and 8, the unequal polar wanderings of adjacent plates.Judging from the above mentioned principles and examining the geological features of China, we find that, some mountain ranges and territories may be considered as junctures of plate tectonics, those are: 1, the Tsinling structural zone, 2, the eastern coast of Taiwan, 3, the Yalutsangpo Eiver in Tibet, 4, the upper stream of Jinsha River, 5, the Lungmen Mountain and "Kangdian axis" and 6, the northern rim of Chilien Mountain.There are some questions, which need to be further studied. 1, The hypothesis of collision of two continents seems to require certain modifications, because almost all of the subduction zones occur along one or both sides of the geosyncline, and two con-tinents do not come to contact directly with each other. It is fairly the same as along the continental margin, where the oceanic plate moves against the continental plate. 2, Can the ultrabasic rocks intrude into continental crust, or can they only be gene-rated in the mantle? 3, If the ultrabasic rocks appear only in the geosyncline, is it possible to say, that the old massifs, in which ultrabasic rocks are present, such as the Taihwa group of Shensi and the Hwaiyang Shield of Dabie Mountain are geosynclinal metamorphic rocks instead of igneous origin? 4, In northwestern Pacific all of the is-land arcs are with the convex side opposite to the underthrusting plate. Is it possible to be considered as a rule to judge that, which side is the undergoing plate ? It is true, that the subduetion zones on the continent and even along the line between Pacific and South America are not in arc form. 5, According to Dickinson, Mitchell and Eeading there is a gap between the trench and volcanic arcs. In China, so far we know, the intrusive bodies are always directly in contact with the subduction zone, with only the Taiwan Strait as an exception. 6, Sometimes there are granite or granodiorite intrusions to be found behind the subduction zone. Is there another subduction zone behind the former one, or were there igneous activities during the folding of geosyn-cline as indicated .by the classical geotectonic theory ? 7, Except in the eastern provinces of China, where the volcanic rocks are wide-spread, in central and western China very rare volcanic rocks have been found along the margin of overriding plate. Whether the volcanic rocks were eroded away on the magma did not rise to the earth surface at all, is still a question.

为便于在大陆上研究板块构造,作者提出了几项原则,作为参考:1.板块接触带时常表现为一条大断层或断裂带,延伸至少数百公里,经常超过一千公里;2.在两个相邻的板块上,沉积岩相和古生物群有显著的划分;3.有混杂堆积的出现;4.有蛇绿岩带的出现;5.有蓝片岩的出现;6.侵入岩与喷出岩具有规律性的分布;7.地震震中的分布;8.两个相邻板块所指极向的不同移动轨迹. 根据上述原则,结合中国地质情况进行分析,作者认为我国有几条山脉和地区可能是板块构造接触带.这些是:1.秦岭东西构造带,2.台湾省东岸,3.西藏的雅鲁藏布江,4.金沙江上游,5.龙门山及“康滇地轴”,6.祁连山北部边缘. 在工作中也遇到了以下几个有待进一步研究的问题:1.大陆板块对大陆板块互相碰撞的说法,似应作一定的修改.因为几乎所有大陆上的俯冲带都是沿着地槽的一边或两边发生的,而不是两个大陆板块直接相互接触.它和大陆边缘的海洋板块对大陆板块的移动,极为相似。2.超基性岩是否能侵入到大陆地壳,还是只能生成于地幔?3.如果说超基性岩只出现于地槽,则古老地块中有超基性岩出现时,是否可以说,这是以前地槽沉积的变质岩,而不是古老的岩浆岩体,例如秦岭的大华群和大别山的淮阳...

为便于在大陆上研究板块构造,作者提出了几项原则,作为参考:1.板块接触带时常表现为一条大断层或断裂带,延伸至少数百公里,经常超过一千公里;2.在两个相邻的板块上,沉积岩相和古生物群有显著的划分;3.有混杂堆积的出现;4.有蛇绿岩带的出现;5.有蓝片岩的出现;6.侵入岩与喷出岩具有规律性的分布;7.地震震中的分布;8.两个相邻板块所指极向的不同移动轨迹. 根据上述原则,结合中国地质情况进行分析,作者认为我国有几条山脉和地区可能是板块构造接触带.这些是:1.秦岭东西构造带,2.台湾省东岸,3.西藏的雅鲁藏布江,4.金沙江上游,5.龙门山及“康滇地轴”,6.祁连山北部边缘. 在工作中也遇到了以下几个有待进一步研究的问题:1.大陆板块对大陆板块互相碰撞的说法,似应作一定的修改.因为几乎所有大陆上的俯冲带都是沿着地槽的一边或两边发生的,而不是两个大陆板块直接相互接触.它和大陆边缘的海洋板块对大陆板块的移动,极为相似。2.超基性岩是否能侵入到大陆地壳,还是只能生成于地幔?3.如果说超基性岩只出现于地槽,则古老地块中有超基性岩出现时,是否可以说,这是以前地槽沉积的变质岩,而不是古老的岩浆岩体,例如秦岭的大华群和大别山的淮阳地盾等。4.在太平洋西北部的岛弧,都是弧形凸侧向着俯冲带.这是否可以认为是辨

 
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