Melting of β-quartz up to 2.0 GPa and thermodynamic optimization of the silica liquidus up to 6.0 GPa     

Pierre Hudon  In-Ho Jung  Don R. Baker 《Physics of the Earth and Planetary Interiors》2002,130(3-4):159-174

Melting relations of β-quartz were experimentally determined at 1.0 GPa (1900±20 °C), 1.5 GPa (2033±20 °C), and 2.0 GPa (2145±20 °C) using a new high-pressure assembly in a piston–cylinder apparatus and substantial differences were found with data previously reported. The new melting data of β-quartz were combined and optimized with all available thermodynamic, volumetric, and phase equilibria data for β-cristobalite, β-quartz and coesite to produce a P–T liquidus diagram for silica valid up to 6.0 GPa. Using the new optimized thermodynamic parameters, the invariant point β-cristobalite+β-quartz+liquid and β-quartz+coesite+liquid were determined to lie at 1687±17 °C and 0.457 GPa, and 2425±25 °C and 5.00 GPa, respectively.  相似文献   

由三元系相图计算活度的方法Ⅱ.有二元同分熔点化合物的体系          下载免费PDF全文

翟玉春  田彦文 《盐湖研究》2002,10(4):35-37

利用熔化自由能 ,由具有同分熔点二元化合物的三元系相图计算活度。计算的范围遍及三元相图的液相面、液相线、共熔线和三元低共熔点  相似文献   

基于Voronoi图的空间方向关系形式化描述模型   总被引：6，自引：1，他引：6  

闫浩文  郭仁忠 《武汉大学学报(信息科学版)》2003,28(4):468-471,479

运用认知心理学信息加工的观点，建立了基于Voronoi图的空间方向关系形式化描述模型，并详细阐述了模型的逻辑结构、数据结构和空间方向的计算过程。为了验证模型的正确性，列举了该模型计算空间方向的几个例子，并总结了模型的优、缺点。  相似文献   

城市地价动态监测点设置的Voronoi方法   总被引：13，自引：0，他引：13  

郑新奇  王家耀 《测绘学院学报》2003,20(4):263-266

依据国家建设城市地价动态监测体系的要求，以济南市地价监测点的布设为数据基础，分析了利用一般方法布设地价监测点存在的问题，试验了利用Voronoi方法对其进行优化的算法思路，利用Voronoi方法对城市地价监测点布设的技术路线及其可行性进行了分析。  相似文献   

A ternary solid solution model for omphacite and its application to geothermobarometry of eclogites from the Middle Adula nappe (Central Alps, Switzerland)   总被引：7，自引：0，他引：7  

C. MEYRE  C. DE CAPITANI  & J. H. PARTZSCH 《Journal of Metamorphic Geology》1997,15(6):687-700

A ternary solid solution model for omphacite with the end-members jadeite (NaAlSi₂O₆), diopside (CaMgSi₂O₆) and hedenbergite (CaFeSi₂O₆) was derived from experimental data from the literature. The subregular solution model, fitted by linear programming, is best suited to omphacites with very little aegirine component in common eclogites. Applying this solution model to the calculation of equilibrium phase diagrams of eclogites from the Adula nappe (Central Alps, Switzerland) results in large stability fields for common eclogite assemblages (garnet+omphacite+quartz+H₂O±kyanite). Within this field the compositions of garnet and omphacite show very little variation. A precise determination of the peak-pressure and temperature is not possible. The occurrence of amphibole, overgrowing the peak-pressure assemblage in fresh eclogite, suggests retrograde re-equilibration, still under eclogite facies conditions. The computation of isopleths for garnet and pyroxene end-members allows the estimation of the pressure and temperature conditions of this re-equilibration event (19–21  kbar, c .  700 °C).  相似文献   

利用不纯净十水芒硝与纯净氯化钾制取硫酸钾的研究   总被引：1，自引：0，他引：1       下载免费PDF全文

张树群  牛自得 《盐湖研究》1997,5(2):30-35

本文通过相图分析，对利用不纯净十水芒硝与纯净氯化钾通过二步转化制取硫酸钾进行了物料配比计算．给出了最佳物料配比及十水芒硝中氯离子的最大含量，对实际生产有指导意义。  相似文献   

人工合成宝石级翡翠的研究   总被引：4，自引：0，他引：4  

朱成明  金志升 《矿物学报》1997,17(3):245-249

本文以对化学试剂为原料，用静奇谈怪论同温高压固相转变法合成宝石级翡翠的机理和工艺条件进行了实验研究，测定了与硬玉化学组分相同的玻璃物质的高压熔融曲线和固相转变的区域，提出了在熔融曲线左侧附近固相区生长优质硬玉的观点，以及在宝石级悲翠合成中的若干技术问题。  相似文献   

Separate Analysis of Remote Sensing Information of Structures of Different Geological Periods and Quantitative Study of Corresponding Tectonic Stress Fields   总被引：1，自引：0，他引：1  

Yang Wunian  Zhu Zhangsen Institute of Remote Sensing  GIS  Chengdu University of Technology  Chengdu  Sichuan Liu Xinzhu  Yang Wencai 《《地质学报》英文版》1997,71(3):344-354

The structural feature shown on a remote sensing image is a synthetic result ofcombination of the deformations produced during the entire geological history of an area.Therefore, the respective tectonic stress field of each of the different stages in the complexdeformation of an area can be reconstructed in three steps: (1) geological structures formed atdifferent times are distinguished in remote sensing image interpretation; (2) structuraldeformation fields at different stages are determined by analyzing relationships betweenmicrostructures (joints and fractures) and the related structures (folds and faults); and (3)tectonic stress fields at different stages are respectively recovered through a study of the featuresof structural deformation fields in different periods. Circular structures and related circlular and radial joints are correlated in space to con-cealed structural rises. The authors propose a new method for establishing a natural model ofthe concealed structural rises and calculating the tectonic stress field by using quantitative dataof the remote sensing information of circular structures and related linear structures.  相似文献   

Investigation of upper crust anisotropy in Ghaen-Birjand region, east-central Iran     

Mohammad-Reza Gheitanchi  Zoya Zarifii 《地震学报(英文版)》2004,17(5):518-525

IntroductionWhenpropagatingthroughananisotropicmedium,ashearwavesplitsintotwo(quasi)shearwaveswithdifferentpropagationspeedsandpolarizedorthogonally.Owingtotherecentdevel-opmentofseismicobservationsystem,detectionofshearwavessplittingwithverysmalldelaytimesbetweenfasterandslowershearwavesbecameavailableandprovidedpowerfulapproachfordetectionofcrustalanisotropy.Crampin(1978)emphasizedtheroleofalignedmicrocracksasacauseofcrustalanisotropyandpointedoutthatforverticallyalignedmicrocracksthedirecti…  相似文献   

Some Basic Concepts of Compositional Geometry     

R. Tolosana-Delgado  N. Otero  V. Pawlowsky-Glahn 《Mathematical Geology》2005,37(7):673-680

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