0.8MaB.P.以来西藏雅鲁藏布江中游地区沙地演化和气候变化

根据地表沉积相特征及其对气候变化的反映,着重讨论了西藏雅鲁藏布江中游沙地形成时代、演化过程和气候变化。沙地早在中更新世中期的０．８ＭａＢ．Ｐ．就已出现,经历了强烈发展、缓慢发展槿相对稳定和缩小与固定的多次迭覆更替,并呈不断扩大趋势。与此同时,气候也经历了冷干和暖湿的多次变化,并表现出不断向干冷化方向发展的趋势。     

珠江三角洲区域一体化研究综合信息系统的设计与应用

在分析地理信息系统技术发展与应用现状的基础上,设计了珠江三角洲区域一体化研究综合信息系统的结构框架。根据珠江三角洲的实际情况,并在经济地理学,城市地理学,区域科学等理论的指导下,开发了针对该区域一体化研究的模型分析系统。基于元数据库的数据集成与模型管理技术,能对不同数据源,不同数据类型与时空特性的多元数据处理与分析。本综合信息系统在区域产业布局,资源窨组合,城市体系空间结构演化等方面得到应用,将为     

黄河下游引黄区沉沙处理运行方案分析研究*

黄河是多沙性河流,引黄必带进大量泥沙,沉沙池沉粗排细,能有效处理泥沙。当沉沙池淤满,失去自流沉沙作用时,采用"以挖待沉"可以延长灌区运行年限,但没有扬水沉沙方案优越。根据黄河下游地上河的特殊地貌条件,如果能在河漫滩上建沉沙池,可以解决沉沙占地的难题。     

黄河故道的环境特征与整体开发

从区域开发的角度,对黄河故道的形成发展与环境的关系进行了分析,提出了开发构想,为黄河故道生态农业的开发提供依据。     

淮河流域洪涝变化吸引子维数研究

淮河流域洪涝序列的功率谱表现出了较好的混沌谱特征,这是序列呈分形结构的内在原因。洪涝序列及其不同平滑序列的关联维数表明,序列平滑程度越大,关联维数越小,关联维数反映了序列所在系统的层次,是系统结构复杂性的重要量度,是 系统建模所需独立变量的控制参数。要恰当地描述淮河流域洪涝发生系数,需构造至少５个状态变量的动力学系统。     

塔里木河流域绿洲边缘土壤蒸发与积盐的初步分析

本文通过对塔里木河流域土壤分的分析测定,视频研究了盐分积累的特点及其与蒸发的关系;盐分含量高,累积速度快、表聚性强。     

乌鲁木齐河“960719”洪水分析

本文依据大量实测洪水数据对乌鲁齐河“９６０７１９”洪水的来源,特点及时空分布变化进行了讨论,分析了这场洪水的重现期,并提出了有关建议。     

长江中下游及邻区基底和花岗岩成矿元素丰度背景的研究

本文系统地研究了长江中下游及邻区的结晶基底,褶皱基底及花岗岩岩基成矿元素丰度背景,从而为区域Ｃｕ、Ａｕ,Ｗ、Ｓｎ等成矿作用提供了一套完整的基础地球化学数据,用此来作为窥视地壳组成及成矿作用时空演变的窗口。     

P–T–t paths and post-metamorphic exhumation of the Day Nui Con Voi shear zone in Vietnam

The Day Nui Con Voi belt in Vietnam is the southeasternmost part of the Red River shear zone in Asia. It is a narrow high-grade metamorphic core complex consisting of garnet–sillimanite–biotite gneisses, mylonite bands, amphibolite layers and migmatites. Geothermobarometric study of the complex revealed that the peak metamorphism took place under amphibolite-facies conditions of 690₋₆₀⁺³⁰°C and 0.65±0.15 GPa and the subsequent mylonitization occurred under greenschist-facies conditions of 480°C and under 0.3 GPa. Fifteen synkinematic hornblende and biotite separates from gneisses, amphibolites and mylonites were dated with the K/Ar method. Hornblende separates from the Day Nui Con Voi give K–Ar ages of 26.4–28.5 Ma, and the biotite separates do give 24.5–24.7 Ma. Combination of thermobarometric and geochronological data yields the cooling history of 500°C at 28 Ma and 300°C at 24 Ma with a cooling rate of 70–110°C Ma⁻¹, and 23 km post-metamorphic exhumation of the core complex. The first 16 km exhumation from the peak of metamorphism (at probably 31 Ma) to 28 Ma was triggered by the left-lateral strike-slip displacement of the Red River shear zone.     

The role of the border city Hunchun on Tumen River, China

Since the Tumen River Area Development Project(TRADP) was launched in 1991, Hunchun city located between North Korea and Russia along the river corridor, has become an important and unique border city. Hunchun, formerly a strategic military city, is emerging as an international trade linkage center through Satouz and Quanhe on the North Korea side and through Changlinzi on the Russian side. Furthermore, the establishment and operation of the Hunchun Border Economic Cooperation Zone (HBECZ) in the city is becoming the main source of the growth, providing a new role for the border city. Its underlying economic momentum comes from the combination of the Chinese-Korean labor force and foreign investment and technology transferred from Korea, Japan, and others. The most important expected new role for Hunchun is as a new 21st century entrepot connection between the Pacific rim and Eurasia by rail and trunk lines, and as a new regional center of the border region based on both a newly generated urban subsystem and the increasing informal sector of cross border business. However, there are many obstacles to overcome in the near future, such as the possible military tensions among the three border nations, the guarantee of free entries and sailing on the Tumen river, and agreements concerning environmental conservation. This revised version was published online in August 2006 with corrections to the Cover Date.