秦岭勉略缝合带两期韧性剪切变形及其动力学意义

构造解析表明勉略蛇绿构造混杂岩带经历了两期韧性逆冲剪切变形 ,早期剪切变形主要发育于蛇绿岩和火山岩岩片中 ,与区域变质作用同期 ,剪切运动方向 NW→ SE;晚期剪切变形具有 NNE→ SSW高角度逆冲特点 ,并使不同岩片推覆叠置 ,构成缝合带现今主导叠瓦状构造样式。变质变形作用研究显示 ,两期剪切变形都具有高压 -低温性质 ;综合变形时代以及整个缝合带构造演化 ,认为它们分别代表了俯冲与碰撞造山期变形 ,并指示洋壳俯冲和碰撞造山作用均具有斜向特点。     

华北与扬子板块碰撞带青岛仰口构造混杂岩的三期变形及区域构造意义

青岛仰口构造混杂岩位于大别－胶南造山带东段，为华北与扬子板块碰撞带边界韧性剪切带内的蛇绿混杂岩．它大体经历了三期变形，始于印支期，历经燕山期至后燕山期．     

北祁连山东段瞭高山构造拼贴体的发现及其意义

瞭高山构造拼贴体的发现对于确定祁连造山带东段中祁连地块北部边界有重大意义.该拼贴体由奥陶系火山岩、大理岩和中晚元古代皋兰岩群绢云石英片岩、变杂砂岩、千枚岩等不同时代地层块体拼贴而成,形成于新元古代末-早古生代.整体成层无序,韧性剪切变形强烈.其变形序列特征反映早期正向逆冲,晚期压剪平移-正向伸展的造山拼贴过程.     

塔里木盆地西北缘石炭-二叠系浊积岩的沉积特征及其构造意义

目的研究塔里木盆地西北缘晚石炭世晚期—中二叠世早期(逍遥—栖霞期)浊积岩沉积特征及其构造意义。方法对塔里木盆地西北缘上石炭统上部—中二叠统下部的浊积岩进行岩石、岩相和时空变化特点的分析。结果从晚石炭世晚期—早二叠世早期到中二叠世早期,浊积岩的沉积范围显著减小,沉积区域在向西南方向收缩的同时水体则进一步加深。结论这种沉积-构造特点反映当时南天山造山带内部处于强烈的构造活动状态,南天山造山带向塔里木地块的冲断推覆可以导致这种沉积-构造格局;从沉积学的角度提出南天山造山带在晚石炭世晚期—中二叠世早期可能处于碰撞造山作用的晚期阶段。     

北祁连山东段嘹高山构造拼贴体的发现及其意义

瞭高山构造拼贴体的发现对于确定祁连造山带东段中祁连地块北部边界有重大意义，该拼贴体由奥陶系火山岩、大理岩和中晚元古代皋兰岩群绢云石英片岩、变杂砂岩、千枚岩等不同时代地层块体拼贴而成，形成于新元古代末一早古生代，整体成层无序，韧性剪切变形强烈，其变形序列特征反映早期正向逆冲，晚期压剪平移一正向伸展的造山拼贴过程。     

鸭子泉-鸭子达坂混杂岩带构造属性及形成时代探讨

鸭子泉-鸭子达坂构造混杂岩前人认为是蛇绿构造混杂岩,经过本次多条剖面和大比例尺构造解析填图及密集样品控制,未发现有幔源洋壳型超镁铁质岩及蛇绿岩组分-远洋沉积的深海硅质岩出露,认为,其构造属性是与阿尔金走滑断裂关系密切的特殊构造带。本次在鸭子泉东超基性侵入岩角闪单辉辉石岩中获得锆石SHRIMP年龄384.4±4.4Ma,其作为最晚形成的块体参与到构造混杂中,以此推测构造混杂岩的上限时间应在早石炭世,在鸭子达坂一带晚三叠世喀勒拉组火山岩与鸭子泉-鸭子达坂构造混杂岩存在角度不整合的关系,以此推测该混杂岩形成的下限时间为二叠纪末。据此认为,鸭子泉-鸭子达坂混杂岩是原地物质受构造影响混杂而成的构造混杂岩,形成时限应接近于石炭-二叠纪。     

柴达木地区晚古生代沉积构造演化

依据野外采集的古流向数据和上古生界火山岩地球化学资料对柴达木地区晚古生代沉积构造演化特征进行研究.结果表明:盆地东部地区物源总体来自北部,海侵方向由南向北,沉积中心在盆地南部地区;构造背景晚泥盆世为后碰撞期的板内拉伸,早石炭世为陆内拉张构造环境,晚石炭世-二叠纪以洋陆俯冲构造背景为主;晚泥盆世开始,柴达木地块周围普遍因拉张而发生裂陷,形成一系列狭长状的地堑式断陷盆地或海槽,柴达木中央隆起(牛鼻子梁古陆)的雏形形成;石炭纪沉积盆地是在海西运动产生的晚泥盆世裂陷槽基础上形成的差异性沉降盆地,具有坳、隆相间的古地理格局,海侵广泛,以台型沉积为主的浅海相碳酸盐岩裂谷盆地,在古陆边缘附近形成了海陆过渡相的泻湖、扇三角洲(或辫状河三角洲)及沼泽相含煤沉积;二叠纪基本保持了石炭纪的海域,仍处于陆缘裂陷盆地的构造背景,属于稳定型浅海相沉积的碎屑岩-碳酸盐岩建造.     

西昆仑早古生代构造演化及其对塔西南盆地的影响

在板块构造理论基础上，通过区内蛇绿岩、与俯冲有关的岩浆岩及相关沉积等综合研究，对西昆仑早古生代构造演化进行了重建：震旦纪－寒武纪西昆仑从塔里木大陆分裂出去，并在它们之间形成“昆仑洋”；寒武纪－奥陶纪“昆仑洋”洋壳向南俯冲于西仑之下，形成库地俯冲带、库地弧前盆地、西昆仑早古生代火山弧及麻扎－黑卡弧后盆地；志留纪－早泥盆世，“昆仑洋”消失，西昆仑早古生代火山弧与塔里木大陆碰撞，并形成塔里木前陆冲断带和泥盆纪前陆盆地磨拉石及塔里木大陆内泥盆纪的“红层相”     

东大别超高压变质带构造研究进展

大别山造山带的形成和演化主要经过南北板块碰撞、碰撞后超高压变质岩折返和燕山早期穹隆构造形成3个构造阶段,其主体构造格架由碰撞后超高压变质岩折返过程中的伸展作用和燕山早期穹隆构造所形成.文中根据不同岩石单元在超高压变质岩折返和穹隆构造形成中的构造表现,以主期构造特征及其后构造演化的一致性为原则,将东大别造山带的变质岩系分为南大别岩片构造带、中大别穹隆构造带和北大别隆滑-逆冲构造带3个构造单元,系统论述了各构造单元构造变形的几何学和运动学特征,从造山带整体构造演化的角度厘定出3个阶段的5期变形,探讨了它们在大别山构造演化和超高压变质岩形成和折返中的动力学意义.     

下扬子地区盆地的"四层楼"结构及其动力学机制

下扬子地区震旦纪以来经历了不同的大地构造与地球动力学背景 ,盆地演化相应地经历了震旦纪—中三叠世海盆→晚三叠世—中侏罗世沿江前陆盆地→晚侏罗世—早白垩世火山岩盆地→晚白垩世—早第三纪陆相伸展盆地。下扬子地区震旦纪—中三叠世海盆发育于伸展性被动大陆边缘。沿江前陆盆地形成于扬子与华北板块碰撞活动中的前陆变形带上。火山岩盆地出现于区域性走滑剪切和环太平洋岩浆弧背景下。库拉—太平洋板块高角度、高速正面向东亚大陆下的俯冲 ,造成了岩石圈上拱拉张 ,从而产生了晚白垩世—早第三纪的陆相伸展盆地。随着西太平洋边缘弧后盆地的出现及印度与欧亚板块的碰撞 ,中国东部遭受近东西向挤压 ,从而结束了下扬子地区的盆地演化历史。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

正~~     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.