The geology of Mount Hasan stratovolcano, central Anatolia, Turkey

Mount Hasan is a double-peaked stratovolcano, located in Central Anatolia, Turkey. The magmas erupted from this multi-caldera complex range from basalt to rhyolite, but are dominated by andesite and dacite. Two terminal cones (Big Mt. Hasan and Small Mt. Hasan) culminate at 3253 m and 3069 m respectively. There are four evolutionary stages in the history of the volcanic complex (stage 1: Kecikalesi volcano, 13 Ma, stage 2: Palaeovolcano, 7 Ma, stage 3: Mesovolcano and stage 4: Neovolcano). The eruptive products consist of lava flows, lava domes, and pyroclastic rocks. The later include ignimbrites, phreatomagmatic intrusive breccias and nuées ardentes, sometimes reworked as lahars. The total volume is estimated to be 354 km³, the area extent 760 km². Textural and mineralogical data suggest that both magma mixing and fractional crystallization were involved in the generation of the andesites and dacites. The magmas erupted from the central volcanoes show a transition with time from tholeite to calc-alkaline. Three generations of basaltic strombolian cones and lava flows were emplaced contemporaneously with the central volcanoes. The corresponding lavas are alkaline with a sodic tendency.     

粉喷搅拌桩加固冲积土层的工程实例

本文以工程实例的形式介绍了粉喷桩在黄河下游软弱冲积土层的应用，并对其适用地质条件、施工工艺及检测方法等进行探讨。     

两种桩体材料复合地基性状的对比研究

通过生石灰搅拌桩和CFG桩的室内力学试验和复合地基现场载荷试验，结合数值分析结果，对这两种桩材的复合地基性状进行了分析研究，并对复合地基的设计计算提出一些新的观点。     

福建省表壳元素丰度

按新一代福建省地质图的岩石地层和侵入岩谱系单位划分的岩石类型采样，经无污染加工，制备组合分析样，由国同３家权威实验室，用中子活化法等１５种分析手段，定量测试６２种元素，又按构造区和岩石类型制备大组合样测定１５种元素。采用福建地壳厚度３１．５ｋｍ，三分法地壳模型，计算福建省表壳、各地质构造单元、以及四大岩石类型的元素丰度，初步讨论福建省地壳与各地质构造单元的主要成分特征。     

碎石桩复合地基承力性状有限元分析

本文通过对碎石桩复合地基的简化，采用有限元方法分析了复合地基的附加应力与桩身应力的分布特征；讨论了桩土应力此与桩土模量比，以及荷载及置换率的相互关系；揭了桩体变形和复合地基塑性区扩展的基本规律。即从不同角度探讨了复合地基的承力性状。     

Research on the Terrane Tectonics in China

This paper summarizes the latest advances in research on the terrane tectonics of China.The terranes of China distributed around various plates may be divided into four terrane belts of different ages and sizes.i.e.,the East China,Northwest China,Southwest China and Qilling-Dabie terrane belts.Among them,the East China belt may be subdivided into three composite terrane groups;each terrane proup is composed of several terranes that were formed roughly at the same time and have distince geologic histories.The accretion of China‘s terranes involver three types;the collision type,the flake-thrusting type,and the docking type.The results of the lates study in the five widening fields and some advances in the methods of research on the terrane tectonics in China are presented in the present paper.     

华北地台中寒武世米级旋回层序与复合海平面变化

笔者在对华北地区中寒武统鲱滩碳酸盐建造露头层序地层学研究工作中首次识别出层序中最基本的地层单元－米级旋回层序，它是露头层序分析最基本的工作单元。本文总结概括出不同体系域内米级旋回层类型和特征。这些米级旋回层序在垂向上叠加构成高级旋回层序时表现出时期性和规律性。这种不同级次的旋回层序的形成受不同动力成因引起折具不同周期和复合海平面变化的控制。     

面向对象的时空数据模型

从存储管理和时空语义表现角度给出了时空数据模型的基本设计思想。同时，从时空对象类型及其数据结构、时空操作方面定义了一个面向对象时空数据模型的逻辑结构。     

影响华北地区的黄河气旋过程分析

利用每小时数值云图、ＴＢＢ资料，常规天气图资料和数值产品资料，分析了１９９４年６月２４－２６日黄河气旋过程，讨论了环境场条件，不同尺度云团的相互作用对气旋生成的影响，给出了中尺度云团的发展演变以及与强降雨的关系，揭示了气旋降雨的中尺度特征，概括了气旋发生发展的综合模型，对气旋的短期预报有一定的参考价值。     

植被覆盖区地质构造信息的数字图象处理

植被覆盖在我国南方具有普遍性。为了充分提取地质构造信息,有必要进行数字图象组合处理。事实证明,同态滤波处理是揭示植被覆盖区地质构造信息的有效手段,而主成分分析和斜变换处理在增强形态特征信息方面也有重要作用,上述处理手段在识别岩石类型及地貌单元方面也有很好的效果。