关于退火温度对VO_2薄膜制备及其电学性质影响的研究

采用真空蒸发-真空退火工艺由V2O5粉末制备VO2薄膜,研究了退火温度对薄膜的影响.经XRD,XPS及电阻-温度测试发现,随退火温度的升高,VO2薄膜先后经历了单斜晶系VO2(B)型→单斜晶系VO2(A)型→四方晶系VO2的变化,在3种类型的薄膜中V均以V4+为主,且在VO2(A)型薄膜中V4+含量最高.薄膜电阻以退火温度460℃时为分界线,低于460℃时,VO2(B)型薄膜电阻和电阻温度系数随退火温度的升高而增大;高于460℃时,四方晶系VO2薄膜的电阻及其电阻温度系数随退火温度的升高呈现相反的趋势.     

不同分辨率下青藏高原对大西洋经向翻转流影响的耦合模式研究

利用耦合地球系统模式CESM1.0, 探究不同分辨率下青藏高原对大西洋经向翻转流(AMOC)的影响。对比有青藏高原地形与无青藏高原地形的试验, 发现移除青藏高原后AMOC的变化与模式分辨率有关, 不同分辨率下AMOC的变化不一致, 低分辨率试验中AMOC强度降低 89%, 高分辨率试验中仅降低13%。产生这种差异的原因是, 不同分辨率下对深水形成有重要贡献的混合层潜沉位置和强度的变化显著不同: 低分辨率试验主要位于格陵兰海?冰岛海?挪威海(GIN), 高分辨率试验主要位于拉布拉多海, 移除青藏高原后, 高、低分辨率试验中潜沉均减弱, 但低分辨率试验中减弱幅度大于高分辨率试验, 高分辨率试验中位于拉布拉多海的潜沉强度减弱最明显, 低分辨率试验中所有海域的潜沉强度均减弱, GIN海域尤其明显。模拟结果与观测风场数据以及北大西洋深水形成最新观测结果的对比表明, 在所研究海域, 低分辨率耦合模式的模拟结果更接近观测值。     

基于文献计量的国际俯冲带研究发展态势分析

本研究在于探索世界主要国家地区俯冲带研究论文产出情况,以期为我国俯冲带研究和相关决策制定提供参考。以Web of Science信息平台的科学引文索引(Science Citation Index Expanded,SCIE)数据库为数据源,利用文献计量方法,分析国际俯冲带研究的年度变化、期刊分布、主要研究国家或地区的发文影响力及合作情况、主要研究机构和国际热点研究内容。结果显示,国际俯冲带研究论文产量一直呈增长趋势;美国的论文产出数量最多、合作中心性最强;中国俯冲带研究论文近3年增量明显,ESI高被引论文比例最高,但国际合作中心性较弱,其发文最多的机构为中国科学院;俯冲带热结构、俯冲与地震的关系、俯冲带中的流体与岩浆作用以及俯冲带成矿是近年来的研究热点。     

Zircon SHRIMP U-Pb dating for olivine gabbro at Wangmuguan in the Beihuaiyang zone and its geological significance

In the Neoproterozoic, a large-scale magmatic activ- ity took place in the northern margin of the South China Block, with ages in a range of 700―800 Ma[1―4]). A systematic zircon U-Pb dating for bimodal metaigneous rocks in the Dabie-Sulu orogen yields ages of 758 ± 15 Ma[5], typifying rift magmatism along the northern margin of the South China Block during the middle Neoproterozoic. In addition, there is a widespread oc- currence of volcanic tuff interlayers around 635 Ma with the se…     

SHRIMP zircon U-Pb dating for subduction-related granitic rocks in the northern part of east Junggar, Xinjiang

A great deal of studies have recently devoted to the Central Asian orogenic belt (CAOB). Some of the studies have proposed that CAOB is a tectonic frame ofcomplex mosaic fragments, link of multiple suture zone and mountain-basin coupling, and has undergon…     

皖中拆离滑脱构造与基底缩短机制探讨

华北地合皖中复式褶皱与拗陷盆地是中生代陆壳多层次拆离滑脱造山运动之产物。北侧发育推覆、滑覆构造,对接于凤-定山区;南为合肥拗陷。结晶基底断块沿先存铲型伸展断层,作反向继承性仰冲或俯冲,使陆壳加积缩短。本文提出了一个在大陆地块碰撞下,以多层次构造拆离为背景的陆壳缩短模式。     

Discovery and geological implication of rodingites derived from eclogites of ophiolites at Changawuzi, western Tianshan, China

We here report the first case of rodingites that were formed at the expense of eclogite enclosed in the ultramafic rocks of Changawuzi ophiolites. The rodingites contain a mineral assemblage of grossular, diopside, prehnite, chlorite, and relict omphacite and Fe-Mg-Al garnets. The presented data indicate that the formation of the rodingites resulted from a phase of secondary serpentinization during exhumation of the subducted oceanic plate. The rodingitization started at 370～410 ℃/6.5～8.5 kbar, while pervasive rodingitization took place under the condition of 200～350 ℃/4～6 kbar. The established PT path shows a retrograde track from eclogites to rodingites. We conclude that the process of rodingitization could also take place under subduction conditions in addition to its more common occurrence under ocean-floor metamorphic conditions.     

Preparation of A-type zeolite membranes on nonporous metal supports by using electrophoretic technique

A-type zeolite membranes were prepared on the nonporous metal supports by using electrophoretic technique. The as-synthesized membranes were characterized by XRD and SEM. The effect of the applied potential on the formation of the A-type zeolite membrane was investigated,and the formation mechanism of zeolite membrane in the electric field was discussed. The results showed that the negative charged zeolite particles could migrate to the anode metal surface homogenously and rapidly under the action of the applied electric field, consequently formed uniform and dense membranes in short time. The applied potential bad great effect on the membrane formation, and more uniform and denser zeolite membranes were prepared on the nonporous metal supports with 1 V potential.     

Indentation tectonics in the accretionary wedge of middle Manila Trench

Based on the multibeam morpho-tectonic analysis of the Manila Trench accretionary wedge and its indentation tectonics and the contrasting researches with other geological and geophysical data, three tectonic zones of the wedge are established, faulting features, tectonic distribution and stress mechanism for the indentation tectonics are analyzed, oblique subduction along Manila Trench with convergent stress of NW55~ is presented, and the relationship of the ceasing of Eastern Subbasin spreading of South China Sea Basin to the formation of subduction zone of Manila Trench is discussed. By the model analysis and regional research, it is found that the seamount subduction along Manila Trench does not lead to the erosion of the accretionary wedge and the oblique subduction actually is a NWWtrending obduction of Luzon micro-plate that results from the NWW-trending displacement of the Philippine Sea plate.     

东疆与邻区的板块构造及其演化

显生宙初，新疆曾是一个统一的陆块。寒武纪晚期开始解体，在新疆东、北部形成斋桑－东准噶尔、康古尔两个洋盆，博格达－哈尔力克、北山两个裂谷系和１２条深、大断裂带。从加里东中晚期开始，两个洋盆边拉张达消减，形成３条俯冲带、２个对接带和７个岛弧带，最后于华力西中期沿克拉表里、康古尔塔格两个对接带闭合。以对接带、俯冲带和深断裂带为界，将东疆及其邻区划分为西伯利亚、准噶尔和塔里木三大板块，１０个次级构造单元。华力西晚期两个裂谷闭合后，中上部地壳强烈水平挤压，产生一系列逆冲－推覆构造等碰撞期后极内构造效应。