造陆作用

Based on the petrological and geochronological study of metamorphic complexes from the Grove Mountains, the following conclusions are reached.(1)Exsolution texture is widely found in clinopyroxene in mafic granulites. A peak metamorphic temperature of 850 C was obtained from the reintegrated compositions of exsolved clinopyroxene. The preservation of augite megacrysts suggests a single episode of high-grade metamorphism for the Grove Mountains.(2)The compositional comparison of garnet from pegmatites with that from country rocks demonstrates that garnet in pegmatites is of xenocryst origin, and late amphibolite facies metamorphism does not occur in this area.(3)The Pan-African charnockite and post-tectonic sheet-like granite were first recognized in East Antarctica. Their occurrences suggest a collisional orogeny during the Pan-African time.(4)The SHRIMP U-Pb zircon dating on various rock types indicates that the major metamorphism in the Grove Mountains occurs at c. 550 Ma, and the tectonothermal evolution terminated at c. 500 Ma. The Grenvillian granulite facies metamorphism did not develop in the studied area.(5)The Prydz belt, the second Pan-African suture within the Gondwana suppercontinent, was further comfirmed based on this study. The Gondwana suppercontinent was not formed by the simply juxtaposition of East and West Gondwana, but by the collision of several blocks during the Pan-African time.

本项目通过格罗夫山地区高级变质杂岩的变质岩石学和同位素年代学研究，获得如下重要认识：（1）发现辉石出溶结构，由此获得峰期变质温度为850 C，并根据火成普通辉石的识别确定该区只存在单相麻粒岩相变质；（2）通过伟晶岩中石榴石斑晶与围岩中石榴石的对比研究提出了石榴石的捕虏晶成因，进而确定该区不存在晚期角闪岩相变质作用；（3）在东南极首次识别出泛非期紫苏花岗岩和后构造层状花岗岩，为泛非构造热事件的碰撞造山成因提供了重要佐证；（4）对不同岩石类型的锆石SHRIMP定年精确地限定了格罗夫山地区主期变质作用发生于泛非期，～550 Ma，热事件结束于～500 Ma，年代学数据没有揭示在该区存在格林威尔期麻粒岩相变质作用的迹象；（5）进一步确认了东南极内部普里兹带的存在，它属于冈瓦纳超大陆内部的第二条泛非期缝合带，据此认为冈瓦纳超大陆并不是由东、西冈瓦纳陆块的简单拼合而成，而是多个不同块体拼合的结果。

The Prydz Belt occurs in the Prydz Bay and Denman Glacier, and is located in the interior of a previously proclaimed unified East Gondwana. The absence of subduction-related rocks, such as ophiolite suite, arc accretionary complex and high-pressure blueschist and eclogite, resulted in the argument that the Prydz Belt represents whether a collisional zone or an intraplate reworking belt.

普里兹造山带主要出露于普里兹湾和登曼冰川，因其位于从前假设的统一东冈瓦纳陆块的内部，加之缺少蛇绿混杂岩、岛弧增生杂岩和高压变质岩等与大洋板块俯冲作用密切相关的岩石，所以当前存在着碰撞造山成因和板内改造成因两种不同的认识。

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。

It is commonly acknowledged that the thrusting which occurs in the front of orogen is another main factor leading to foreland basin inversion, the strike-slip inversion and oblique inversion.

造山带前缘的逆冲体系作用也是引起前陆盆地反转的主要因素，走滑反转和斜向反转在造山带中也很普遍。

A good many mico-landblock of the early Neoproterozoic-Cambrian volcanic rock that distribute in the Tianshan orogenic belt and on its both sides, and the Carboniferous-Permian volcanic rocks that widely distribute in the Tianshan and adjacent regions are selected for subject investigating in this paper. Renewing the ocean-land format and ocean-land conversion process of Tianshan orogenic belt in the Paleozoic is the masterstroke for this paper. On the basis of detailed field investigation, many subjects, such asregional lithology、geochemistry、structural geology、volcanic sedimentology geology、sotope geochronology and synthesis analysis study of geophysics data, are adopted as instrumentality in the paper, this study lays emphasis on the formation, evolution and dynamics of early Neoproterozoic-Cambrian and Carboniferous-Permian volcanic rock in the Tianshan and its adjacent regions to find out Carboniferous-Permian volcanic rock property, eruptive sequence, time and space distribution characteristics, to resume and reconstruct evolution process of Carboniferous-Permian volcanic rock, and to explore connection of magmatism process and lithosphere stretching action of neopaleozoic ocean-land transformation in the Tianshan region.

本文选择分布于天山及其两侧的诸多微陆块上新元古代—早寒武世火山岩和天山地区广泛发育的石炭纪—早二叠世火山岩为研究对象，以恢复重建天山造山带古生代洋陆格局和洋陆转换过程为主线，在详细的野外工作基础上，综合运用区域岩石学、地球化学、构造地质学、火山沉积学、同位素地质年代学、区域地球物理资料综合分析研究等多学科手段，重点研究天山及其邻区新元代—早寒武世和石炭—二迭纪火山岩系的形成演化及其动力学，查明天山石炭纪火山岩系的性质、喷发序列、时空分布特点，恢复重建其形成演化过程，探索天山地区晚古生代洋陆转换过程中火山岩浆作用与岩石圈拉伸作用的关系。

Its main aims include:(1) understanding the magmatic processes of the volcanic rocks and their petrogeneses;(2) discussing the possible enrichment processes induced by subduction of continental slab;(3) providing geochemical constraints on the nature of lithosphere (including the subcontinental lithospheric mantle and lower crust) of the different tectonic units confined by the major faults across the belt; and (4) geochemical comparison of the lithosphere in an attempt to define the possible boundary between the North China and Yangtze Blocks during Mesozoic time.

中文摘要：项目开展了穿越苏鲁造山带南北向晚中生代火山岩及相关火成岩的廊带剖面(包括苏鲁带的胶东、青岛、滁州和下扬子地区的溧水盆地)的地球化学研究，理解各区块晚中生代岩浆作用过程和成因，探索大陆俯冲作用的地幔富集过程以认知各主要断裂围限地区的岩石圈性质；通过对比不同地区的岩石圈性质来限定苏鲁地区华北与扬子陆块的中生代碰撞边界。

Distant effect of Jurassic collisions of Qiangtang terrane,Lasa terrane and Paleo\|Pacific land onto the Eurasian land made East Qinling\|Dabie Mountains in a compressional circumstance for a long time,and suppressed its orogenic extension;whereas,Cretaceous late\|collisional extension and appearance of West Pacific trench\|arc\|basin system relieved East Qinling\|Dabie Mountains of external compression,instantly result in violent orogenic lithosphere delamination\|extension and depressurized\|calefactive melting,and consequently,led to the formation of large scale Early Cretaceous granitoids and intermediate\|acidic volcanic rocks.

羌塘地体、拉萨地体和西太平洋古陆在侏罗纪与欧亚大陆拼贴碰撞的远距离效应使东秦岭-大别造山带长期处于挤压环境，伸展作用被抑制；白垩纪的碰撞晚期伸展和西太平洋沟弧盆体系的远距离效应使东秦岭-大别地区的外部挤压消失，导致造山带岩石圈迅速强烈拆沉伸展和减压增温熔融，从而形成大规模早白垩世花岗岩类和中酸性火山岩。

This belt was formed during the Indo-China Stage of intracontinental collision of East Qinling Orogen Belt; 9. Many structural features imply the existence of Wudangshan nappe, which was formed by intracontinental subduction during Indo-China stage; and 10. The evidences of stratigraphy, petrology and structure imply that the collision of the two Paleoplate took place during the last stage of Caledonian, while the intracontinental subduction and the nappe took place during Indo-China stage, and the transcurrent basins took place during Yenshan stage. In the last part of this article, all kinds of favourable mineral forming conditions were analysed.

这条高压变质带是印支期东秦岭造山带陆间碰撞阶段产生的；9、各种构造迹象表明武当山推覆体的存在，它是印支期因陆间俯冲造成的准原地推覆体；10、地层、岩石、构造等各方面的证据表明南北板块的碰撞发生于加里东末期，而海西期至印支期为陆间俯冲和推覆作用阶段，燕山期则是应力松驰和断陷盆地发育的阶段，本文最后对区内各种有利的成矿地质条件作了扼要的分析。

During the early stage of Yanshan Movement in the Mesozoic Era, when the North China Plate had completed joining the Yangtze Plate to become a new united Craton massif, the tectonic movement turned to intracontinental orogenic stage, resulting in widespread magmatic activity and migmatization so that Tianzhu granitic batholith intruded the area on a large scale to form an embryo of the granite peak forest in the Tianzhu mountain area and ultrahigh pressure metamorphic zone further retraced its way, and consequently outcropped on the crust surface.

中生代燕山早期，华北、扬子板块已完成对接拼合，形成了新的统一的克拉通地块，构造运动已转入陆内造山阶段，引起广泛的岩浆作用和混合岩化作用，天柱山花岗质岩基大规模侵入，形成了区内天柱山花岗岩峰林胚胎，并导致超高压变质带进一步折返，并最终出露地表。

The orogenic strata have following characteristics: During the subduction and intracontinental orogeny, the strata experienced dramatic tectonic migration and mixing, resulting in various tectonic features. A short sequence usually composed of tectonic slices of various origins, times, deformations and metamorphisms, and scales. The original sequence was badly destroyed. The extant fragments of orogenic belt usually took form as melanges, especially the accretion complex wedge generated in subduction zone, which is contrary to the Law of Superposition. The original location of the accretion is also contradicted with the Law of Original Horizonality, because the accretion is oblique with high degree. Marine rocks, volcanic rocks of continental margin and metamorphic rocks were well-developed in the orogenic belt, especially ultra-basic, basic rocks were wide spread and were intensely metamorphosed, accompanied by metamorphic slices returned from hundred kilometers underground with ultra-high pressure and magma movements during syn-orogeny and post-orogeny, thus formed the colorful landscapes.

造山带非史密斯地层构成具如下独特性和复杂性：造山带在俯冲碰撞和陆内造山阶段，发生过强烈的构造搬运和构造混杂，构造形迹多样化，垂直不长的地层体往往是众多不同来源、不同时代，不同变形变质程度，不同大小的各种构造岩片拼贴体，地层原始层序被严重肢解、破坏；尤以产于俯冲带的俯冲增生杂岩楔的原始形成方式与史密斯地层学的&层序叠覆律&老下新上的顺序正好相反，其混杂岩增生方式是老的&片体&在上，新的&片体&阶段性拼贴在老的&增生片体&的斜下方，这种增生片体的原始位置亦与&原始水平律&相悖，即增生片体一般保持较高角度倾斜；在岩石类型和变质程度上，造山带海相和古陆缘火山岩以及变质岩普遍发育，尤其是超基性、基性岩系分布广泛，变质作用较强，伴有从百余公里以下深部超高压变质岩片的折返和同造山期与造山后期岩浆活动，构成极为复杂的地质景观。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。