陆壳

The oceanic basin was finally been closed to form a new unified continent in the end of Carboniferous, went through two periods of plate tectonic system and two times of main underthrust collision orogeny.

摘 要：甘肃、内蒙古北山地区从寒武纪初期在前震旦纪统一古陆壳的基础上发生裂解，到石炭纪末洋盆最终闭合形成新的统一大陆，先后经历了两期板块构造体制和两次主要的俯冲-碰撞造山作用。

With the constraints from published paleopmagnetic data on motion rates of continental blocks prior to their collision, this work firstly proposed the ultra-fast subduction rate could assist the underthrust of low-density continental crust into mantle depth to some extents.

在综合古地磁和地球物理资料的基础上，本文首次提出快速俯冲过程是一种驱动陆壳进行俯冲的因素，在超高压变质带的形成过程中，快速俯冲过程可能起到了某种程度的驱动作用。

The report contains a Geographic Information Systems compilation of geophysical, geological, and tectonic data for the Circum-North Pacific. This area includes the Russian Far East, Alaska, the Canadian Cordillera, linking continental shelves, and adjacent oceans. This compilation can be used to: study the Mesozoic and Cenozoic collisional and accretionary tectonics that assembled this continental crust of this region; study the neotectonics of active and passive plate margins in this region; and construct and interpret geophysical, geologic, and tectonic models of the region.

报告对环北太平洋地球物理、地质和板块构造的数据进行了地理信息系统编辑，包括俄罗斯远东、阿拉斯加、加拿大山脉、以及相连的大陆架和海域，可用于研究中生代和新生代碰撞加积的板块，这个板块是由此区域的陆壳组合而成的，研究活跃与不活跃板块边缘的新板块构造，并且建立和解释此区域的地球物理、地质和构造模型。

The alkline hot-fluid brecciated rocks belt along or in the vicinity of the synfault system are 400km long, which may have shown tectonic geographic location being the most extensively extension at the continental crust in the Qinling at that time.

沿其产出的碱性热流体角砾岩带长达400km，指示了石炭纪在深部地质作用参与下秦岭陆壳伸展最强烈的构造古地理位置。

This thesis studies the volcanic tectono-petrofacies, petrology, mineralogy, geochemistry, isotopic chronology, stratum and high-precision SHRIMP zircon U-Pb datings of the Mt.Yandangshan volcano-intrusive complex, and concludes that: Yandangshan volcanic rock units belong to high-K calc-alkaline acid rock associations, mainly ryholitic and trachytic dacitic in composition. They have A/CNK values of 0.9-1.2 (i.e., aluminium saturation and supersaturation), enriched LREE and LILEs and depleted HFSE. Their 8Eu values are 0.11-0.32, indicating a evident fractional evolution of plagioclase crystallization. Their ∑REE varied very limitedly,(87~Sr/(86)Sri ratios and eNd values are 0.7086～0.7095 and -10.20～-9.96 for volcanic rocks, and 0.7087~0.7095 and -7.6～6.92 for the central intrusive facies syenite, which means that all the igneous rocks from Mt. Yandangshan are evolutional products of magmas with the same source, and that they derived mainly from crust, but mixed with mantle components.

本文从火山构造岩相学、岩石学、矿物学、地球化学、同位素年代学、地层学等方面出发，同时结合高精度SHRIMP锆石U-Pb定年，对雁荡山火山岩进行了系统的研究，确定雁荡山火山岩为一套以流纹质和粗面英安质为主体的高钾钙碱性酸性岩石组合，A/CNK值集中在0.9～1.2之间，为铝饱和或铝过饱和类型；富轻稀土元素和大阳离子亲石元素、相对亏损高场强元素：负铕异常明显，δEu值为0.11～0.32，表明岩浆经历了以斜长石为主的强烈结晶分异作用：岩石样品的∑REE变化有限，火山岩样品的~(87Sr/~(86)Sr_i为0.7086～0.7095，εNd为-10.20～-9.96，中央侵入体石英正长岩~(87Sr/~(86)Sr_i为0.7087～0.7095，εNd为-7.6～-6.92，表明它们是同源岩浆分异演化的产物，物质来源主要为陆壳，但有地幔物质参与。

The main tectonic features of the four stages mentioned above can be summarized as follows, gneissic basement and greenstone belt in the Archean, formation and rifting of ancient continental crust in the Transition, creation and disposal of the first supercontinent Columbia in the Paleoproterozoic-Mesoproterozoic, and the assembly and disassembly of the supercontinent Rodinea under plate tectonic framework in Neoproterozoic.

这四大阶段的主要构造面貌分别是：片麻岩基底和绿岩带盆地，古陆壳的形成与裂解，第一个超级大陆即哥伦比亚超大陆的形成与离散，板块构造体制下罗迪尼亚超大陆的汇聚与离散，反映了大陆岩石圈的形成和由低级向高级的演化，因而每一阶段都有不同于前一阶段的沉积建造、火成岩类型及组合、变质作用、构造样式、构造线方向、变形方式和成矿作用。

The growth of the continental crust of southeastern China has been discussed based on the compilation of Nd isotopic model ages of metamorphic basement and granitoid rocks from the region.

中国东南变质基底岩石及各时代花岗岩的Nd同位素模式年龄的统计研究结果表明，该地区太古代—古元古代陆壳以横向增生方式形成，显生宙表现为局部的垂向增生。

Combined with available data, it is comidered that the sourcerock of biotite--leptynite might be intermediate-acid volcanic material of ca.2.7 Ga, and that of migmatized leptite and quartzite might come from granitic crust older than 3.0 Ga. The iron formation was formed on the continental crust base at about 2.7 Ga, and was immediately metamorphosed for the first time.

结合已有的研究资料可以认为，黑云变粒岩的原岩来自2.7 Ga左右的中酸性火山物质，浅粒岩和石英岩的原岩来自3.0 Ga以上的花岗质地壳物质；含铁建造形成于陆壳基底之上，形成时间约2.7 Ga，并于2.5—2.7 Ga之间发生首次变质作用。

All of these charac-teristics are similar to those of continental crust transformation series granite in South China,implying that their parent magma may be derived from the unexposed Proterozoic metasedimentary rocks.

这些特征都相似于华南陆壳改造系列花岗岩，它们的母岩浆可能来源于

Sulu UHP eclogites are products of collision between South and North blocks. Subduction-exhumationof volumetrically continental materials gave rise to formation of diverse UHP metamorphic rocks, and simultaneously titanium mineralization with rutile as principle ore mineral.

苏鲁地区超高压榴辉岩是华南-华北板块碰撞的结果，巨量陆壳物质俯冲-折返形成了多样式的高压-超高压岩石，与此同时也发生了以金红石为主要矿石矿物的钛成矿作用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。