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岩石圈

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It is shown that, in some areas, such as Tarim Basin, Beishan and Qaidam Basin, although the results derived from traditional Airy model and lithospheric isostasy model are close, the lithospheric isostasy model can explain the nature of the mass balance in a more reasonable way.

计算结果表明,在一些地区,如塔里木盆地、北山和柴达木盆地,尽管岩石圈均衡模型和Airy模型得到了一致的海拔值,但岩石圈均衡模型更能体现均衡过程的物理本质;除青藏高原造山带外的多数块体,岩石圈均衡模型的计算结果更接近观测海拔和地表垂直运动状态;总体上,考虑地幔岩石圈热结构影响后,中国大陆各地区的均衡结果普遍优于传统的均衡模型。

The transition of source region from lithospheric mantle to asthenosphere indicates the thinning of lithospheric mantle and upwelling of asthenosphere caused by large scale strikeslip fault, which is the major controlling factor for decomposition melting of phlogopite in the metasomatized lithospheric mantle to generate the typeI ultrapotassic magmatism.

岩浆源区从岩石圈地幔向软流圈演变,暗示大型走滑断裂引起的岩石圈地幔减薄和软流圈上涌是导致交代岩石圈地幔金云母分解熔融产生区内I型超钾质岩浆的主控因素。

If this explanation is correct, the present lithosphere mantle in the North China block is mainly the relict after the Mesozoic lithospheric thinning, rather than the new accreted mantle.

华北岩石圈地幔的低水含量有可能是由于上升软流圈的热侵蚀造成的,因此目前的华北岩石圈地幔可能大部分都是中生代岩石圈减薄后的残余,而不是新生地幔。

Firstly, based on the distribution of global earthquakes and their kinematic and dynamic characteristics, the most active global-scale tectonics can be divided into three first-order tectonic system: the circum-Pacific deep subduction tectonic system, which is the region that oceanic lithosphere subduct under continental lithosphere; the mid-oceanic ridge tectonic system, where the joint tectonics of rift valleys and transform faults distribute widely; and the continent-continent shallow underthrusting tectonic system, where the different kinds of continental faults affect each other.

其中,环太平洋构造系以大洋岩石圈向大陆岩石圈俯冲为构造特征;大洋中脊构造系以大洋岩石圈内裂谷-转换断层的组合构造为特征;大陆构造系则以大陆岩石圈的边缘和内部各种断裂的相互作用为特征。

The geochemistry, oxygen isotopic composition and biotite composition of the syenite suggest that its rock-forming material was derived from the enriched upper mantle.

渐新世碱性正长岩与中新世钾质火山岩构成了该区碰撞后的构造岩浆组合,是在印度-欧亚板块碰撞引起的岩石圈加厚及高原隆升的基础上,岩石圈拆沉、软流圈上涌导致富集的岩石圈地幔部分熔融所形成的。

Occurrence of tectonic heat event on late-Mesozoic in Ordos basin result from intensive thermal mobility of deep lithosphere on the late-Mesozoic,Thermal mobility of deep lithosphere in sourth region is stronger than in north region. Mantle occur underplating and thickness of lithosphere reduce, magma invasion and eruption occur on late-Mesozoic. Ordos basin be in weak extension environment on late-Mesozoic.

鄂尔多斯盆地中生代晚期构造热事件发生的根本原因在于中生代晚期岩石圈深部的热活动增强,盆地南部岩石圈深部热活动性更强,早白垩世鄂尔多斯盆地处于一种弱拉张的构造环境,地幔发生底侵作用,岩石圈减薄,发生岩浆侵入和喷发。

On the basis of lithosphere dynamics, it is possible to deduce whether the boundary fault cuts through the Moho into the upper mantle of the lithosphere or not, and it is also possible to get the distributions of the values of Te in the study area by gravity tomography. Therefore, it helps to further understand the deep lithospheric geodynamical features in this study area.

通过岩石圈动力学理论,不仅可以推断边界断裂是地壳断裂还是地幔断裂,而且可以通过重力反演得到该区岩石圈有效弹性厚度的分布特征,从而进一步了解该区深部岩石圈形变特征。

Based on the summary of newest progresses of global gravity field models, isostatic models and flexural theory of Hthosphere and making used of global gravity model (UTCSR GRACE/GFZ EIGEN-GRACE), First, I calculate geoidal anomalies with different degrees and orders, isostatic residual geoidal anomalies of Hthosphere and horizontal stress distribution in Chinese mainland and vicinity and make an interpretation with multi-levels isostatic equilibrium. Secondly, combination with surface geology and others geophysical data, I analyze detailed structure of lithosphere within various segments of the central orogenic system, respectively. Then, On the basis of making a comparative analysis with among East-Asian tomography, anomalies of geoid and satellite magnetic field for lithosphere and gravity and aeromagnetic, I propose a the lithospheric structural framework model for the Chinese mainland and adjacent area, specially the COS.

利用国际最新的地球重力场模型(UTCSR GRACE/GFZ EIGEN-GRACE)和GTOPO 30数字高程模型,笔者首先计算了中国大陆不同球谐阶次大地水准面异常、岩石圈均衡剩余大地水准面异常和水平应力场分布,从岩石圈内多层次均衡角度进行了解释推断;其次,结合地表地质和其它综合地球物理资料,分区段对中央造山系及邻区分析与解释了岩石圈细结构;然后,通过东亚地区地震层析、大地水准面异常和卫星岩石圈磁场、全国重力与航空磁力对比分析,建立了中国大陆及其邻区岩石圈,特别是中央造山系的初步结构框架。

Accompany with the subduction of Pacific and Indian plates, upper mantle convected more violently, and new upwelling astheosphere replaced and eroded the lithosphere, and resulted in irregular thinning of cloud-like mantle along reticulated or dondroid weak zones. The thinning was dominated by replacement of lithosphere with new upwelling astheosphere, and accompanied possibly by delamination.

在这过程中,特别是伴随太平洋、印度洋板块的俯冲作用,地幔对流加剧,上涌的新生软流体顶蚀置换岩石圈,从而造成了沿早期业已存在的幔内薄弱带网络,出现类以&蘑菇云状&的地幔不规则减薄,这种减薄以新生软流体取代岩石圈为主,并可能伴随一定程度的岩石圈拆沉作用发生。

Whereas the seismic thermal lithosphere is about 150km thick, which means the Tarim lithosphere is not steady and became thinner. In this paper, writers analyzed the Tarim lithosphere thinning mechanism based on the tectonic thermal evolution quantitative method, and discussed three possibilities:the hotter India asthenosphere intruded under the Tarim lithosphere and made the Tarim lithosphere became unsteady;the bottom of Tarim lithosphere is heated by friction of the atheonosphere flow and washed off by the hot asthenosphere; the Xizang lithosphere delamination induced the convection, and the upflowing mentle heated the bottom of the Tarim lithosphere and make it enthinning.

本文利用构造热演化方法对塔里木岩石圈减薄的热演化过程进行了定量分析,探讨了塔里木盆地岩石圈减薄可能的三种机制:印度板块与欧亚板块碰撞后青藏高原岩石圈底部的软流圈较塔里木盆地岩石圈底部的软流圈的温度要高,青藏高原的软流圈地幔向塔里木盆地岩石圈底部侵入形成的热扰动使得塔里木盆地岩石圈底部的温度升高;塔里木岩石圈与其下流动的软流圈的摩擦剪切生热导致其岩石圈地幔底部温度升高,使得岩石圈底部发生热侵蚀,从而使得与软流圈接触的岩石圈地幔不断地加入到软流圈地幔;在塔里木盆地岩石圈的下部,青藏高原的岩石圈在该处发生了拆沉,从而诱发的软流圈地幔对流,上升的软流圈地幔流使得岩石圈地幔的温度升高而熔融,成为软流圈地幔。

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