几何定向最优化方案的探讨

本文从几何定向精度对贯通误差的影响着手,采用SWIFT(sequential WeightIncxeasing Factor Technique)优化法,并借助于PC—1500机,Basic语言来寻找几何定向的最佳图形,提高定向精度,确保隧道正确贯通。     

辽宁省金矿集中区及其与构造样式的关系

本文将辽宁省金矿划分四种类型,十个主要金矿集中区。这些集中区均受华北地台东西向基底构造活动带及中生代太平洋板块俯冲影响、所产生的北西向构造挤压带和北东向构造—岩浆岩带的复合作用控制。它们分别处于太不洋成矿带的内带(辽东)和外带(辽西)。并以郯庐断裂为轴线,构成了两大“U”字形,类似共轭曲线展布的构造样式。根据深部地球物理资料,综合分析了控制金矿集中区构造样式的形成机制。区内脉状金矿大都分布在深断裂(深度大于五公里断裂)带附近。     

The role of vibrationally excited nitrogen in the ionosphere

Theoretical and experimental aspects of the production, transformation, diffusion and loss of N₂ in the upper atmosphere are considered. The N₂-CO₂ near-resonant system in theD andE regions is taken into account. We describe our understanding of the methods necessary to find the vibrational populations of N₂ and CO₂ (asymmetric mode of CO₂). The calculations of the vibrational temperatures in theD, E, andF regions for the mid-latitude ionosphere and an aurora are presented. The connection between the excited species and the 4.26-m radiation intensities is considered. The models for the rate coefficient of the reaction of O⁺ with N₂ and the electron density decrease resulting from N₂ in the F region are discussed.     

论宁夏金场子渗流热卤水-表生改造型金矿床的矿源

稳定同位素、岩石微量元素(金)和地质特征研究的结果,表明金场子金矿床的成矿物质来源系上地壳源,并且金、银、铅、铜等金属和硫、硒、砷、氯、氟、碳等来源于石炭纪和泥盆纪沉积岩。成矿流体是大气水和沉积地层水的混合溶液。金矿化与地热流体渗流热卤水成矿作用和表生风化成矿作用有关。     

非线性弹性模型的改进

本文在邓肯-张模型进行深入探讨的基础上,提出了切线模量实质物理意义是剪切模量的观点,并分别采用应力法和应变法推导了剪切模量和体积模量(或变形模量)公式,还进行了考虑Biot固结非线性弹性油罐地基有限元实例分析。对不同的变形模量计算方法进行了比较,提出了改进的非线性弹性模型。     

大别造山带钾氩年龄的解释—差异上升的地块

根据冷却年龄理论和大别造山带变质岩K-Ar表面年龄的平面分布,指出这些年龄既不代表岩石形成事件,也不简单地反映后期热事件,而代表岩石经剥蚀隆起温度下降到该矿物封度温度以来的时间,即反映地区的构造隆起历史。现有资料说明大别造山带整体在印支期开始隆起,但中部罗田—英山一带则隆起较快或地热增温率高,因而表现出年轻(燕山期)的表面年龄。     

逆冲断层前锋带的构造样式

由于逆冲断层产出构造环境和规模的不同，其前缘可以有拆离型，褶皱型，前冲型，反冲型等多种样式；每种样式又可具不同特征。此外，逆冲前缘还常伴生一些重力构造，盆地构造和不同方向的反转构造。各种构造样式可以相互转化和过渡而共存于同一逆冲带，或发育于不同逆冲带中。它们是研究塑冲作用的动力状态，，扩展方式和发展阶段的重要依据。     

滇中郝家河砂岩铜矿的地球化学及其成因意义

本文论术字滇中生代地层与矿区及春外围马头山组中铜的时空分布与迁移富集规律，揭示了矿床的沉积－后期叠加改造成因。成矿作用经历了同生沉积形成矿源层，后期叠加改造形成矿体的过程。后期改造中铜元素发生了大量迁移，矿质主要来自矿体之下伏紫色矿源层。     

The Yaean Metamorphic Core Complex and Extensional Detachment Fault in Inner Mangolia, China

The article describes the characteristics of the Yagan metamorphic core complex, especially the associated detachment fault and various extensional structures in its footwall. The age of the complex is discussed in some detail as well. The basic features of the Yagan metamorphic complex (Jurassic in age) are similar to those of the metamorphic core complex (Tertiary in age) in the Cordilleran area; they are as follows: (a) mylonitic gneisses in the footwall, (b) chloritized sheared mylonitic rocks, (c) pseudotachylites and flinty cataclasites or microbreccias, (d) unmetamorphosed or epimetamorphic rocks in the hanging wall with a layer of fault gouges or incohesive fault breccia next to the detachment fault. In contrast to its Cordilleran counterpart, however, there are many extensional faults with different styles (from dactile low-angle normal faults through brittle-ductile to brittle high-angle normal faults)in the footwall.     

1989 Datong-Yanggao Earthquake with Ms=6.1

In this paper,the basic conditions and characteristics of the Datong-Yanggao earthquake are described in detail.The type of the earthquake,the aftershock activity,the earthquake trend,the characteristics of damage are analyzed and discussed.This earthquake belongs to a sequence of earthquake swarm type and is of the concentratedly occurring characteristics of several main shocks in a time sequence,and the aftershock activity was normally attenuated.Because of the unreasonable design of buildings and repeated vibration by several destructive main shocks within a short period,the damage in the high intensity region was aggravated.The analysis and the prediction procedure of the 1991 Datong-Yanggao earthquake(Ms=5.8)are also briefly given.