计算分层介质中位错点源静态位移场的广义反射、透射系数矩阵和离散波数方法

本文将计算合成地震图的广义反射、透射系数矩阵和离散波数方法应用于静态问题,给出了分层介质中位错点源产生的静态位移场的计算方法。该方法保留了反射、透射矩阵方法的原有优点,通过将数值结果与解析解的对比表明,该方法具有较高的数值精度,可用于研究地震断层活动造成的地表形变。     

Stresses and displacements due to underground mining using a finite element procedure

Summary A two dimensional finite element procedure is applied to simulate a coal mining excavation sequence. A procedure with linear solution steps is developed and applied to an idealized mountain cross-section with exceptionally thick coal seams and large dip angle. The results provide information on pillar pressure, floor and roof stability, displacement characteristics and surface subsidence.The results presented here were obtained in the course of research sponsored by the Department of Energy, Mines and Resources, Grant No. 69-2570.     

北极地区斯匹次卑尔根岛的构造演变

斯匹次卑尔根岛是斯瓦尔巴特群岛中最大的岛屿,具有较全的地质时代记录、反映多次构造运动的构造现象。本文从构造组合的观点,对斯匹次卑尔根岛的构造划分为东西向、南北向、北北西向三组方向,它们反映了本区自元古代以来至少经历了三次不同方向的构造应力场作用。     

Flow and grainsize pattern in a sharply curved river bend

The main characteristics of river flow and grainsize in a bend of the sand bedded meandering river Dommel, The Netherlands, are presented. Measurements were carried out at a relatively low discharge in a sharply curved bend following a long straight reach. In the studied bend, secondary circulation is restricted to the thalweg area; only in the downstream part of the bend it exists over the entire cross-section. Therefore, on the entire pointbar platform, which comprises the larger part of the bend, the median sedimentation diameter of the bedload material is governed by the distribution of the longitudinal components of the bed shear stress only.     

Gas chromatographic determination of peroxyacetyl nitrate: Two convenient calibration techniques

Two procedures for the calibration of an electron capture detector (ECD) for peroxyacetyl nitrate (PAN) are discussed. One is based on the first-order decay rate of the the PAN mixing ratio in conditioned glass storage vessels. The other method makes use of the photochemical generation of PAN in mixtures of acetone and NO₂ in air. For this purpose a Penray Hg lamp was inserted into a glass vessel filled with 1 atmosphere of air containing 10 ppm NO₂ and 1% acetone. After 3 min of irradiation, the average PAN mixing ratio formed was 8.87±0.25 ppmv as determined in six separate runs.     

北京房山花岗闪长岩体及其附近现今应力状态分析

由本区实测原地应力资料分析认为,总体呈北东走向的八宝山、黄庄-高丽营断裂带总体活动性质为顺时针扭动。断裂带不同地段的实测应力状态各具的特征,不同于京津唐地区实测主压应力的主导方向。运用弹性理论的应力叠加原理计算出断层附近的附加应力状态,则显示了总体呈北东走向的断裂带存在张性反扭活动分量,大灰厂和牛口峪地段断层也存在同样特征。认为自唐山大震后,本区应力状态仍处于调整阶段。测得的较深部位的应力状态也似乎受到了构造活动的影响     

湖南童家院锑矿床地下空洞的成因探讨

童家院锑矿床广泛发育地下空洞,影响矿山开采。本文根据矿田构造和矿化特征研究,认为本区至少经受过两期构造应力作用。成矿前,在左旋水平扭动作用下,形成NE向锡矿山复式背斜、纵向逆断层和矿化空洞,成矿后,在NE向挤压应力下,产生了NW向叠加褶皱以及正断层。同时,该应力场所控制的层间破碎带和背斜,大大影响了地下空洞的成生和分布。     

中生代火山岩铀矿与重力场的关系

本文在综合整理中国东南沿海一带区域物化探资料的基础上,对羊洲-下桐市-火轩市-酒港一带中生代火山岩铀矿化与深层构造和物化探异常的关系进行了研究。讨论了莫霍面、区域重力场和深层构造的关系;重力梯度带与火山岩铀矿的关系;重力梯度带内浅部重力异常与铀矿的关系。提出了中生代火山岩型铀成矿带与上地幔变异带、重力梯度带之间有密切相关的分布规律,重力梯度带内的浅部重力异常可以确定铀矿的空间位置等看法。此外,水系沉积物的分析结果也反映出Cu、Pb、Zn、Ag以及Ni、Cr、Co等元素的异常,在重力梯度带内有着特定的展布规律,其空间分布与铀元素也具有密切的联系。     

吉林省北部A型花岗岩的初步认识

分布在吉林省北部的香水、治安一带的正长花岗岩、碱长花岗岩，研究后认为属Ａ型花岗岩。其行征钾长石为微斜长石一条纹长石，斜长石大部分为奥长石Ａｎ＝１３－１７。并有碱性碱物无辉石。     

莺－琼盆地YA13－1气田热流体活动与有机／无机成岩响应

根据钻井中途测试（ＤＳＴ）、重复地层测试（ＲＦＴ）、镜质体反射率（Ｒ０）、流体包裹体分析和粘土矿物Ｘ射线衍射全定量分析等综合研究发现，莺－琼盆地ＹＡ１３－１气田存在４期热流体活动；南侧的崖南地区和西侧的莺歌海盆地是其两个重要的热流体物质源和动力源；多期热流体活动在ＹＡ１３－１地区不仅造成热异常和物质迁移，而且还引起了不同的有机／无机成岩响应，如骨架颗粒的多期溶蚀作用、至少两期的次生加大作用、粘土矿物转化和有机质热成熟作用异常。第二、第三期热流体因出溶作用形成ＹＡ１３－１气田大规模的天然气聚集。