MICAPS3.0的本地化和二次开发

MICAPS3.0系统的主要用途是为预报员提供一个天气分析显示的工作平台。气象预报和服务人员通过此平台检索各种气象数据,显示气象数据的图形和图象,对各种气象图形进行编辑加工,诊断分析气象条件,进行中期、短期、短时天气预报制作。     

Sm–Nd geochronology and petrography of garnet pyroxene granulites in the northern Sulu region of China and their geotectonic implication

Abundant garnet-bearing granulite lenses are widely distributed in the northern part of the Sulu region and adjacent areas. They are possibly re-metamorphosed high-pressure metamorphic rocks. On the basis of detailed petrographic study, samples WD01, WD04 and ML06 from Laixi and Wendeng were identified as high-pressure granulites, and WH1 from Weihai as an original coesite-bearing eclogite. Three high-pressure granulite samples give mineral-WR isochron ages of 1846±76, 1743±79 and 1752±30 Ma. TDM ages are 3.3, 3.0 and 2.8 Ga. The Sm–Nd mineral-WR isochron ages are interpreted to date as the metamorphic resetting within the medium-pressure granulite facies, representing an isotopic re-homogeneity during uplifting of the high-pressure granulites from deep continent crust. It is important that Sm–Nd chronological characteristics are the same as Archaean high-pressure granulites in the North China craton. However, sample WH1 from Weihai demonstrates abnormal Sm–Nd characteristics. Its whole rock _Nd (0) value is +129. TDM age is 1.3 Ga, and constrains the minimum age of re-metamorphosed eclogite protolith formation to the mid-Proterozoic. This result is identical to those reported by Jahn (1994), showing complicated processes of metamorphism and metasomatism. The data in this paper provide further evidence to define the boundary between the North China craton and UHPM belt in eastern Shandong and to understand the geotectonic nature of the boundary.     

一种基于知识的航空影像中道路半自动提取方法

利用线特征算子和多种线状地物跟踪方法建立了一种基于知识的航空影像中道路半自动提取方法。该算法计算量小 ,判断速度快 ,准确率较高 ,并且有较好的适应性。试验表明这是一种良好的道路提取方法。     

伽师及邻近地区GPS地壳形变监测及初步分析

通过对伽师及邻近地区ＧＰＳ监测网的优化布设和两期观测资料的分析,对伽师及邻近地区的地形变特征进行了探讨,认为伽师地区整体上受到正南北向的主压应力,但在喀什和乌恰－乌仁一带存在着较大的剪应力。伽师地区每年相对于北天山（哈萨克斯坦）的运动速度为１９ｍｍ,整个南天山地区发生中强地震的可能性将长期存在。     

永定河上游晚更新世晚期以来的堆积阶地年代测定

应用1 4 C测年法和热释光方法对采自永定河上游晚更新世晚期以来形成的堆积阶地样品进行了年代测定。研究结果表明 ,永定河上游三条一级支流的低阶地形成时代具有一定的同时性 ,第三级阶地的下切时间大约在 30 0 0 0aB .P .;第二级阶地的下切时间大约在 10 0 0 0aB .P .;第一级阶地的下切时间大约在 4 0 0 0aB .P .。气候变暖对第二级阶地形成起主导作用 ,构造作用对最新阶地形成有一定的影响     

Isotopic chronology and geological events of Precambrian complex in Taihangshan region

There are five major geological events in Precambrian complex, Taihangshan region determined by researching into geology and isotopic chronology of the complex. Basaltic magma erupted and quartz-dioritic to tonalitic magma intruded in earlier neo-Archaean, which formed hornblende-plagiogneiss of Fuping gneiss complex and metamorphic mafic rock enclaves in TTG gneiss complex. Granulite facies metamorphism and emplacement of biotite-plagiogneiss occurred in late neo-Archaean. Extension and uplifting from the end of neo-Archaean to Paleoproterozoic era formed Chengnanzhuang large extensional deformation zones and metamorphic mafic veins emplaced into the deformation zones. Remobilization of Precambrian complex and tectonic uplifting in late Paleoproterozoic era formed Longquanguan ductile shear zone and emplacement of Nanying gneiss. Occurrence of regional granite pegmatite at the end of Paleoproterozoic era means the end of the Lliang movement.     

Soil evolution features of debris flow waste-shoal land

The reclamation and utilization of debris flow waste-shoal land plays an important role in the mitigation and control of debris flow hazards, which thus contributes a lot to the exploitation of insufficient land resources in mountainous areas and the reduction of losses caused by debris flow. The aim of this paper is to discuss the features and mechanism of soil evolution of debris flow waste-shoal land so as to search for the available modes of its reclamation and utilization. The Jiangjiagou Ravine, a typical debris flow ravine, was selected to study soil evolution features of debris flow waste-shoal land based on the analysis of soil physieochemical properties and soil microstructure. It was found that the soil evolution rates of debris flow waste-shoal land varied with different modes of reclamation. For the land which had been reclaimed for less than lO years, soil evolved most rapidly in paddy fields, and more rapidly in dry farmland than in naturally restored waste-shoal land. For the land which had been used for more than lo years, the soil evolution rates of dry farmland, naturally restored waste-shoal land and paddy farmland decreased in the file. For the same utilization period of time, significant differences were recognized in soil evolution features under different modes of reclamation. Analysis data showed that soil clay content, soil thickness, the psephicity of skeleton particles and contents of microaggregates （〈0.02 mm） in paddy farmland were all highest. Soil nutrients and porosity of dry farmland were better than those of paddy farmland and naturally restored waste-shoal land, and those of paddy farmland were superior to those of naturally restored waste-shoal land. Paddy farmland characterized by rapid pedogenesis, stable evolution and high utilizability was the priority candidate for the reclamation and utilization of debris flow waste -shoal land.     

甘肃省席芨水地区遥感蚀变信息提取及找矿远景分析

在地质工作程度较低、基岩出露较好的地区,充分重视遥感数据的使用,可有效地缩小工作靶区,提高找矿效率。该文以甘肃省席芨水地区为研究区,基于ETM+遥感数据,利用多元数据分析、准归一化、掩膜分析、主成分分析、密度分割等方法,从Landsat7ETM+数据中提取金矿化蚀变信息。在遥感地质解译的基础上,充分分析提取的羟基异常和铁染异常,结合区域地质特征、区域成控矿条件及区域物化探异常特征等,尽可能去掉假、弱异常。结果表明:该方法能有效消除植被、水系、阴影等干扰信息的影响,从遥感数据载体中提取微弱的金矿化蚀变信息。提取的矿化蚀变信息与断裂构造具有较好的相关性,主要分布于断裂构造交会处、断裂与岩体交会处等成矿优势部位,对今后的找矿工作具有一定的指导意义。     

高温高压下岩石电导率不同测量方法的实验对比——以二辉橄榄岩为例

利用YJ-3000t紧装式六面顶压机,在1.0GPa、500～900℃和2.0GPa、500～950℃的实验条件下,同时采用交流阻抗谱法(AC0.05～10-6Hz)、直流法(DC)和单频交流法(0.1Hz)三种方法对采自河北大麻坪玄武岩中的尖晶石二辉橄榄岩进行了电导率的实验测量.实验结果表明:在实验的温度和压力范围内...     

汉源县大渡河“8.6”崩塌堵河灾害研究

2009-08-06四川省汉源县顺河乡猴子岩发生大型崩塌,90余万m~3崩塌体直接冲进大渡河,形成40 m高的堰塞坝,阻断大渡河,形成库容达6 000×10~4 m~3堰塞湖,导致2人死亡,29人失踪和重大财产损失.以现场调查与观测为基础,分析灾害发育条件和成灾过程,认为高陡边坡次级断裂造成的岩体破裂是崩塌发育的基础条件,"5.12"汶川大地震、强降雨及道路工程建设造成的边坡失稳是灾害发生的重要原因.针对崩塌堵河灾害的成灾特点,提出加强山区重大工程区地质灾害评价、预防、预警,科学设计、施工减少陡坡开挖,采取果断措施处置施工过程中出现的险情、灾情,及时在灾害点设置警示标志减少灾害损失等减灾对策.