The main dark mineral and accessory mineral of syenogranite are biotite and sphere, with abundant mafic microgranular enclaves, a common feature of KCG, which formed in the transition stage of continental subduction and collision. In the discrimination diagrams, all samples fall into the syn-collision area.

巖石暗色礦物為黑云母欧美激情大色堂丁香五月，副礦物出現(xiàn)榍石而未見富鋁礦物久操伊人，富含暗色包體www.26uuuu，與過鋁質花崗巖相伴生人人摸人人操589，為較典型的 KCG巖石組合亚洲欧美日韩色图，屬于由俯沖作用向大陸碰撞演化過程中構造體制轉換階段的產(chǎn)物国产精品久久九九免费视频，而在構造環(huán)境判別圖解中均落入同碰撞花崗巖區(qū)域。

By analysing the molasse sediment, tectonic stress field, thrust fault system and comparing them with volcanic rocks and granites in the region, it is showed that Dabie orogenic belt had a strong intracontinental orogenesis whose deep dynamic processes were controlled by subduction with delamination during late stage of Cretaceous period-late Cretaceous period.

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Kalamaili suture zone is an important plate boundary in north Xinjiang, and there are plenty of Neopaleozoic volcanic rocks around itThese volcanic rocks are enriched in LILEs and relatively depleted in HFSEs, and they are also characterized by high Nb, Zr, TiO2 contents and Zr/Y, Nb/Y ratios, and depleted SrNd isotopesThe characteristics of these volcanic rocks suggest that they were produced in postcollisional periodThe postcollisional volcanic rocks around Kalamaili suture zone become younger from west to east, which indicates that this suture zone entered postcollisional period gradually from west to east, and reflects that the Kalamaili Ocean had been closed gradually from west to eastAs to the Kalamaili suture zone in postcollisional period, the lithosphere extended and thinned, and the asthenosphere materials upwelled and melted partially, and intensive mantle convection occurred, leading to a plenty of mantlederived magmas underplating the suture zoneThe lithospheric mantle metasomatized by fluid in subduction period melted partially under decompression and high temperature, the resulting melts contaminated the underplating asthenospheric materials, and the erupted lavas became the Neopaleozoic postcollisional volcanic rocks

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The general feature of deformation caused by the collision between two continents also reveals that, during the collision process, apart from a foreland basin and high mountains being formed, there is another compressive depression with an asymmetric structure developed on the side of the obducted plate, which is much easier to be formed when the dip angle of the collisional fracture zone is between 15° and 30° and is the deepest with a dip angle of 30°. This implies that the compressive depression is controlled by both subduction and obduction between two continents.

從大陸與大陸碰掛變形構造特征看日本高清中文字幕，除發(fā)育前陸盆地－山脈系統(tǒng)外同性AV无码免费无禁网站，在仰沖陸塊一側靠近造山帶后緣還發(fā)育呈不對稱結構的擠壓性凹陷，當兩個大陸板塊碰撞斷裂帶傾角在15~30°時殴美A片免的视频刺激的，該類型凹陷更容易形成欧美在线观看精品，其中以30°傾角對應的凹陷最深，反映其形成可能是大陸碰撞過程中陸塊之間相對俯沖和仰沖運動的綜合結果永久免费看A片无码不卡网站。

On the other hand, the less the friction factor of a collision-related fracture zone, the stronger the subduction and obduction movements between two continents, and the friction factor should not be larger than 0.2 so as to be able to form a high mountain and a deep basin by the collision between two continents.

碰撞斷裂帶摩擦系數(shù)越小精品亚洲一区二区三区中文字幕，碰撞過程中兩個大陸板塊之間相對俯沖和仰沖作用越強，形成高大的山脈和深陷的盆地要求碰撞斷裂帶摩擦系數(shù)≤0.2女的高潮喷水视频。

And combined with the transformation of the basin-basin and basin-mountain formed by Caledonian movement, the author thinks that,(1)the Yangtze and Huaxia are still the different plates in Caledonian period, Yangtze plate is subduction plate, Huaxia plate is obduction plate by the activation of PreSinian period tectonic plate joint belt.

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The rocks were probably situated in the followup obduction of split upper crust cover of the Yangtze Plate onto the North China Plate in or after the subduction of the Yangtze Plates continental materials towards the North China Plate,or were placed by southward thrusting when ultrahighpressure metamorphic rocks underpinned.

通過露頭的構造地質分析，推斷本套地層是在揚子板塊陸殼物質向華北板塊下深俯沖過程期間或其后揚子板塊陸殼上部蓋層繼續(xù)向華北板塊仰沖就位的国产又粗又大在线观看，在超高壓變質巖折返時經(jīng)歷了由北向南的逆沖www.BLA片。

In view of an analysis from lithospheric geoid, horizontal stress and existing seismic tomographic data and so on, they show that Chinese mainland and adjacent area is controlled by mantle dynamics of interaction, mutual influence and constraint by western Pacific ocean plate, Indian plate and circum-Siberian arc tectonics that formed after Paleo-Asian ocean closed, which consist of three tectonic areas, with on the base of the Tethyan tectonic realm. Overall tectonic framework of the Chinese mainland is outwards obduction along main tectonic borders within shallow crust and inwards subduction and convergence within deep lithospheric mantle from south-western, south-eastern and northern parts, respectively.

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Three important conclusions are as follows:(1) the H2O content in garnet and omphacite can be up to 2000ppm and 3000ppm by weight respectively, indicating that they are significant carrier recycing surficial water into deep earth;(2) the heterogeneous distribution at the small scale of the H2O content and hydrogen isotopic ratios suggest that the whole subduction- exhumation process should be very fast;(3) the regular decrease of H2O content from rim to core within some garnet and omphacite grains indicates that hydrogen diffused out from mineral lattice during exhumation in response to sharp pressure decrease, and such hydrogen is expected to be involved in the early-stage retrograde metamorphism.

取得的主要科學認識包括：(1)石榴石和綠輝石的結構水含量可以分別高至2000ppm和3000ppm2017综合色五月天，這表明它們是板塊俯沖過程中將地表水攜帶進地球深部的重要載體欧美一级高清片；(2)水含量和氫同位素組成表現(xiàn)出小尺度的不均一分布，說明板塊的俯沖和折返過程是十分快速的中文字幕第五二区第一页；(3)在板塊折返的早期无码一级毛片一区二区，由于壓力的降低黄网页在线播放，礦物中的H 會發(fā)生不同程度和尺度的擴散，這是早期退變質流體的重要來源又粗又硬的免费黄色网站。

The evolution of palaeogeography in this region took place under the background of subduction of the Kula-Pacific plate in NNW direction.

古地理演化以庫拉-太平洋板塊向NNW向消減作用為地質背景超碰免费一欧美精品。