1. The protolyte for the Kangbutiebao formation with volcanic-sedimentary rocks resides in the formation with quartz ceratophyre, ceratophyre and protolyte formed at about 413Ma. They attribute to the calc-alkalic unit from basic to intermediate to silicic volcanic rocks resulted from the melting and differentiation evolvement of oceanic crust with assimilating crustal material in the continent-arc setting due to oceanic plate subduction.
康布铁堡组变质火山沉积岩组合原岩为一套石英角斑质岩-角斑岩-细碧岩的火山岩建造,形成于413Ma左右,是陆缘弧环境中板块俯冲作用下洋壳熔融、同化陆壳物质,并经结晶分异演化,最终形成的一套基性-中性-酸性的钙碱性火山岩组合。
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2. Since India-Asia collision at about cenozoic, folding and thrusting have shortened Indian plate crust of the Himalaya and south Tibet by hundreds of kilometres, Nonth of ITS, The Asian plate crust and lithosphere of the Tibetan plateau has been undergoing homogeneous deformation involving North-south shortening, resulting in the double crustal thickness and thickend lithosphere upper mantle.
从新生代开始印度板块与欧亚板块发生高角度陆—陆俯冲,青藏高原内部发生以垂直应变为主的缩短变形。
3. The evolution process under the control of the multigeodynamic force system (including the boundary forces of Eurasia-Pacific-Indian three massive plates around Nansha block, effects of the deep mantle, relative soft layer-sliding planes within Nansha lithosphere block and the earth''s rotational inertial force) can be briefly divided four stages: the late Cretaceous to the early Eocene stage of uprilfing-erosion and shear-extension caused by the oceanwards-eastwards withdrew of Pacific subduction zone and the delamination of proto-subducted slab after the stage of pre-Cretaceous pre-rifting active continentoceanic plate margin. In this stage, the Nansha transcrustal layering-block started to move southeastwards on the Nansha transcrustal layer-sliding plane, meanwhile, the Andu-Bisheng and Liyue-Banyue basement layering-block slid on their upper-crust layer-sliding planes, and Xibu accretion zone was formed. Successively, it entered the stage of the mid-Eocene to early Oligocene, when NW-SE sea-floor spreading occurred in the southwest subbasin owing to the slip-line field initiated by the collision between the Indian and Eurasian plates, Zengmu foreland-basin started to develop in the same time. And in the stage of late Oligocene to early Miocene, near NS simple-shear extension and sea-floor spreading in the central subbasin of eastern South China Sea resulted from the south-southeastwards drawing-force of the mantle-flow. The crustal layering-blocks and the Miri accretion zone formed also in this stage.
南沙岩石圈新生代微板块及板内层块构造的动力演化过程,在多元动力等因素(如块体之外的欧-太-印三大板块运动边界力和地幔深部活动因素、块体内部软弱层滑面以及地球自转变化)控制下,大致经历了4个阶段的演化:从前晚白垩世的裂前活动陆-洋板块边缘阶段因太平洋俯冲带向东跃迁、原向NNW俯冲消亡的板片的拆沉、幔隆而进入晚白垩世-早始新世的隆升剥蚀、剪切伸展演化阶段,南沙超壳层块顺超壳层滑面祥东南运移、安渡-毕生与礼乐-半月基底层块沿上壳层滑面拆离,西布增生带形成;继而先后在中始新世-早渐新世期间受印-欧板块碰撞滑线场、地球自转加速影响出现西南海盆NW-SE向海底扩张和曾母前陆盆地的发育,和晚渐新世-早中新世期间南—东南向地幔流牵引造成的中央次海盆近NS向单剪伸展与海底扩张、壳体层块向南差异滑移、米里增生带形成;中中新世以来,印度-澳洲板块快速向北俯冲,构成今日南海格局。
4. We applied the theoretical results combined with GPS and absolute gravity observation data to study the subduction rate of the India plate to Eurasia subduction, the crustal deformation and gravity changes caused by the co-seismic dislocation of the Lijiang and Tang Gula earthquakes. From this study, the absolute gravity changes at the western Yunnan and Lhasa stations were founded.
通过本项目的研究,我们从重复绝对重力观测结果中发现了滇西地区、青藏高原的拉萨点绝对重力值的变化;研究了丽江7.0地震同震位错与重力变化的关系;印度板块与欧亚大陆俯冲等引起的重力变化。
5. In Lhasa - Gangdise block, crustal high-conductivity layers might be the electrical traces of the northward underthrusting of Indian plate. And the cause of crustal high conductivity layer there is probably friction heat, which can lead to rock partial melting and dehydration in the process of underthrusting. In Qiangtang block, causes of crustal high conductivity layer might be the heating effect of upwelling mantle-derived material, leading to the warming up and thus partial melting of middle and lower crustal rock. There are no apparent underthrusting traces in Qiangtang block.
在拉萨-冈底斯地块,壳内高导层可能是印度板块向北俯冲的电性痕迹,高导层的成因与板块俯冲过程中由于摩擦生热导致岩石部分熔融和脱水作用有关;在羌塘地块,壳内高导层可能是由于幔源物质上涌的烘烤作用导致中、下地壳岩石温度升高,发生部分熔融现象的结果;羌塘地块内未见明显的板块俯冲痕迹。
6. The authors think that the magmas of the intermediate-acid volcanic rocks were derived from basaltic magmas of the lower crust and are mixed magmas produced by the increase of geothermal gradients due to diapiric injection of basaltic magmas and partial melting of intermediate-basic metamorphic igneous rocks in the lower crust, and that they resulted from a series of tectonomagmatic activities that took place when the closing of the Mongolian-Okhotsk sea trough and continent-continent collision caused crustal thickening and brought about the formation of the Hinggan-Mongolian orogenic belt in the process of oblique subduction of the Paleo-Pacific plate beneath the Siberian plate.
中文摘要:通过对大兴安岭北段晚侏罗世吉祥峰组中酸性火山岩的岩石地球化学研究,发现其中存在高Sr低Y型火山岩,即文献上所称的埃达克质岩,笔者认为中酸性火山岩的岩浆起源于下地壳玄武质岩浆,为玄武质岩浆底辟上侵引起地热梯度增加、下地壳中基性变质火成岩石部分熔融的之混合岩浆,是古太平洋板块向西伯利亚板块斜向俯冲过程中,蒙古鄂霍次克海槽封闭,陆壳碰撞使地壳加厚,形成兴蒙造山带时所引起的一系列构造岩浆活动。
7. The authors propose a view that the action of the Philippine Sea plate was the main dynamic force of Quaternary tectonic movement in this area and that the Bashi structure is the trigger structure for the crustal movement in the area.
分析了菲律宾板块与欧亚板块的接触关系和相互作用,认为菲律宾板块的作用是该区第四纪构造运动的主要驱动力,巴士系构造是该区地壳运动的触发构造。
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8. Plate tectonics is explained, including motive force of crustal movement, delimitation and boundary of plates, relation be-tween plate tectonics and earthquake.
介绍了关于地球地壳运动的板块学说理论,主要内容是板块运动的动力、板块的划分、板块的分界线,以及板块构造学说与地震的关系。
9. Depression-Uplift structure is a basic structural unit developed on crustal surface, it is secondary structure and is superposed upon larger plate tectonics.
坳陷构造是地壳表层的基本构造单元,它叠加在大的板块(或地块)构造之上,属于二级结构构造。
10. The rocks are crustal remelting, shall level granites formed in a within-plate tensional tectonic environment.
岩石属于大陆板内张性构造环境下高侵位形成的壳源重熔型花岗岩类。
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11. The maximum principal strain in the network is 2.9 × 10 - 8. The observation result shows that the northward push by the Indian plate has still played the dominant role in the crustal movement in China.
网内最大主应变量为2.9×10-8.观测结果表明,印度板块向北挤压依然是影响我国地壳运动的主要因素。
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12. Global plate motion patterns have been verified and improved by modern space geodetic techniques such as GPS, VLBI and SLR - The driving force of plate motion and crustal deformation, however, remains a heated problem in dispute.
板块构造学说是20世纪最伟大的科学成就之一,并且得到了GPS等现代空间测地技术的支持,但板块运动或地壳形变的驱动力源却一直没有真正得到解决。
13. Our result show that the primary driving force source accounting for the crustal movement in this region is from the collision between the India and Eurasia plate as well as the huge gravity potential energy of the Qinghai Xizang Plateau.
结果表明,造成中国大陆及邻区现今地壳运动及形变的主要动力来源为印度-欧亚板块碰撞及中国西部地区,特别是青藏高原的巨大重力位能。
14. It is closely connected with earth shape, formation and evolvement, plate motion, crustal isostatic adjust and geodynamics.
它与地球的形状、形成及演化、板块运动、地壳均衡调整状态、地球动力学过程和矿产资源分布有着密切的关系。
15. Intraplate and plate margin horizontal crustal deformation revealed by preliminary results observed at GPS tracing stations
GPS跟踪站观测的初步结果所揭示的板内及板缘地壳水平运动
16. Most of the earthquake data recorded by our seismograph network are in the range of 3 ° - 13 °. The study of Pnl - wave in this range shows great significance in the research of regional stress field, plate dynamics and crustal structures.
我国地震台网所记录到的国内地震大部分落在3&13°的范围内,因此在此范围内的Pnl波对研究区域应力场,板块动力学及地壳结构具有非常重要的意义。+
17. Furthermore, the rheological property of the plate is taken into account, for the crustal evolution with stress relaxation and strain creeping is responsible for the forming of the fracture.
又因以百万年计的地壳演变所具有的应力松弛和应变蠕变对造成此裂缝的作用,必须考虑此板块的流变性质。
18. The formation of the Qinghai-Tibet Plateau was not caused by the collision between India Plate and Eurasia Plate, but by intraplate basin-mountain coupling driven by lower crustal flow.
青藏高原不是印度板块与欧亚板块碰撞的结果,而是形成于下地壳流动驱动的板内盆山作用。
19. The genetic model of the deposit was established: From late Jurassic to early Cretaceous, influenced by the subduction of paleo-Pacific Plate to Eurasian Plate, the basaltic magma added to the lower crust underplating way, , and leads to the partial melting of crust and crustal uplift.
建立了矿床成因模式:晚侏罗&早白垩世,受古太平洋板块向欧亚板块俯冲的影响,来自地幔的玄武质岩浆以底侵作用方式添加到下地壳,并导致下地壳部分熔融和地壳隆升。
20. Nd isotopic model ages of basement rocks suggested that the crustal age of Ili plate in the north (1.9Ga) is younger than that of the South Tianshan (STS) fold belt in the south (2.2Ga).
本区北部伊犁地块基底岩石的Nd同位素模式年龄约为1.9Ga,南部南天山褶皱带的约为2.2Ga。
1. Virginia is not on an active earthquake fault belt and is roughly in the middle of the North American continental crustal plate.