查询词典 subduction

A number of geological and mineral composition and geochemical investigations indicate that the deep geodynamics process and mantle characteristics of middle Jurassic gabbros suits from south Jiangxi province are distinguish from Cretaceous gabbros suits from coastal belt of Fijian province, the former are related to mantle upwelling and lithosphere extension, the later are related to subduction and lie on back-arc basin in tectonic environment.

对赣南车步辉长岩类的地质特征、矿物学和地球化学特征进行了研究，着重讨论它与沿海辉长岩类构造环境和源区性质的不同，研究表明它可能是中国东南部中侏罗世软流圈上涌、岩石圈伸展和地壳裂解的产物，而沿海白垩纪辉长岩类的构造环境是弧后拉张盆地；车步辉长岩类的源区可能是未受到明显俯冲组分影响的富集地幔，而沿海白垩纪辉长岩类的源区可能包含较多俯冲组分。

The metamorphic peridotites display SiO2 (39.08%~40.45%),TiO2 (0.02%~0.03%), Mg′(87.10~90.33). The metamorphic gabbros show geochemical characteristics of enriched in LILE, and depleted in HFSE. Furthermore, there are some high-Mg diorites exposed. In summary, the Daomaoqi ophiolitic mélange formed in a supra-subduction zone.

其中，变质橄榄岩类SiO2含量为39.08%~40.45%，TiO2含量为0.02%~0.03%，Mg′为87.10~90.33，；变质辉长岩表现为大离子亲石元素K、Rb、Sr、Ba明显富集，高场强元素Nb、Ta、Zr相对亏损，以及高镁闪长岩的出露都与SSZ型蛇绿岩特点相符。

Many crustal zircons have the age (up to 2770Ma) that is much earlier than the formation of ophiolite considered by previous researchers, indicated the abundant subduction crust components occur in the zircons separated, which was preserved in the mantle, and outcropped with the mantle cycle process.

纯橄岩样品四个测点得到加权平均值为130.0±2.8Ma，属早白垩世，代表了纯橄岩的结晶年龄；研究中发现许多地壳成因的古老锆石(最老可达太古代2770Ma)，远远早于目前主流观点中蛇绿岩的形成时间中生代晚期，综合考虑认为所选锆石有大量俯冲地壳成分，在地幔中保存，后随地幔循环运移出露地表。

The ultramafic rocks outcropped at the Altyn region are all harzburgites. Remant grains of primary minerals have melted residual texture and elastic deformation texture under high temperature and pressure. The whole-rock analyses show their low TiO〓 contents (0.01～0.04%), low Al, Ca and high MgO contents and wide Mg〓 range (89.35～95.57). Rare earth patterns have two types, namely tabacco pipe-shped and LREE-shaped, of which the former is often seen. The chondrite-nomalized Yb values of these analyses are all lower than 1. The spinels have low Ti and high Cr content and most spinels have Cr# higher than 60. All of the above characteristics show that the ultramafic rocks in the Altyn fault zone are components of metmorphic peridotites of ophiolite from depleted mantle source and most ophiolites from this zone belong to supra-subduction zone type ophiolite with a few mid-ocean ridge basalt type.

阿尔金露头区的超基性岩全为方辉橄榄岩，残余的新鲜矿物颗粒发育有熔融残余结构和高温高压下塑性变形结构，全岩分析显示样品TiO〓的含量低，为0.01～0.04％，具有低的Al和Ca，MgO含量高，Mg〓为89.35～95.57；稀土配分型式有两种，即烟斗型和LREE亏损型，前者占绝大多数，Yb球粒陨石标准化后的值全都小于1；尖晶石低Ti高Cr，大部分尖晶石的Cr〓大于60，上述特征说明阿尔金超基性岩是蛇绿岩的地幔橄榄岩成员，来自亏损的地幔源区，阿尔金蛇绿岩大多属于俯冲带之上型蛇绿岩，有少量的大洋中脊型蛇绿岩。

In the environment of pressure stress field that caused by the movement toward north of India, Australia and Pacific plates to the south and east, a strong intracontinental subduction overprinted on the deep delamination. of Dabie orogenic belt, and the subducting sediments of Yangtse plate were melted to form the "syncollision" peraluminous granite of this epoch.

在中国大陆南部和东部的印度、澳大利亚和太平洋板块的北向运动所造成的NS向挤压应力场环境中，大别造山带在深部拆沉作用的基础上，又叠加了一次强烈的陆内俯冲作用，俯冲的扬子板块沉积物质熔融形成该期&同碰撞&过铝质花岗岩。

In North Tibet, the advanced subduction plate started to break off, which resulted in mixture of the crust materials and mantle materials, and formed the source region of richening molten materials. The large-scale volcanic activity appeared in the central-north part of the plateau.

高原北部，先行俯冲板片发生断离，其地壳物质与地幔物质混合，从而形成板内富集熔体的源区，并在高原中、北部形成大规模的火山岩。

At the convergent boundaries of plates, when one plate subducts into the another, the form of the subduction boundaries bears a close relation with the properties of the subducting and subducted plates.

在板块的汇聚边界上，若一板块向另一板块俯冲下插，所形成的俯冲边界的形态与俯冲板块、被俯冲板块的性质有很大关系。

And then a local extension took place in the region of intra-Eastern Tethys when the India plate drifted to the north but suffered the resistance from the Lhasa block, contemporarily, the intra-oceanic subduction are triggered, subsequently, magmas derived from a partial melting of mantle wedge which suffered from the modification by subducted continental marginal clastics and oceanic sediments upwelled along the oceanic ridges, forming several small marginal basins during 120～128 Ma, and thus lead to the so-called SSZ-type oceanic crust.

于120～128Ma，一些规模较小的边缘洋盆形成，卷入陆缘碎屑和洋壳沉积的地幔楔发生熔融产生岩浆，沿着破裂的扩张脊上涌产生了具有TNT负异常的SSZ型新洋壳，期间产生了俯冲洋壳重熔作用，标志着年轻的热的洋壳俯冲形成的埃达克岩侵入于仁布SSZ蛇绿岩地幔橄榄岩中。

The high Mg^# calc-alkaline and high Mg^# shoshonitic series in Qiangtang-Mangkang area indicate some intracontinental subduction happened ever in the middle part of the plateau, then the subducted slab broke off and asthenosphere was upwelled 30Ma ago, while the lithospheric mantle was melt to form low Mg^# peralkaline potassic, ultrapotassic series.

综合地球物理资料，提出青藏高原在印度大陆岩石圈的强力楔入下，高原内部软流圈物质沿欧亚岩石圈地幔俯冲板片的顶部向北东和南东挤出，使上覆岩石圈地幔发生剪切破裂，形成一系列串珠状高速体与低速体的相间分布，并随时间不断向北扩展。

The low values of Nb/U (7~8) suggest that the basalts probably experienced the addition of some subduction-related materials and/or a certain degree of crust contamination.

较低的Nb/U比值(7~8)暗示该玄武质岩浆在形成过程中遭受了一定程度的大陆地壳混染或与俯冲过程有关的物质的加入。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。