环境因素变化与斜坡稳定性关系分析──宝成线K190工点病害成因启示

通过对宝成线１９０工点病害历程的定性、定量分析，表明环境因素变化对斜坡稳定性有着至关重要的影响．本文具体地分析了病害的成因．     

大口径转盘式桩孔钻机改装成回转冲击反循环钻机

大口径转盘式桩孔钻机改装成回转冲击反循环钻机地矿部勘探技术研究所付美华目前，国内在基桩钻孔施工中，绝大多数使用以ＧＰＳ－１５型为代表的转盘钻机（钻孔直径１．５ｍ，钻深５０ｍ），使用刮刀钻头或钻斗，在土层或粒径小的局部卵石层中钻孔，正循环排渣，是钻基桩...     

马达加斯加东南部麻粒岩地区U—Pb,单颗粒锆石Pb蒸发以及Sm…

马达加斯加是位于莫桑比克带东界的一个研究程度较低的前寒武纪地区，遭受了泛非运动的强烈影响。这个巨大的岛屿是冈瓦纳大陆的关键部分，因而主变质事件的精确测年对于复原这一超大陆是至关重要的。在该岛的东南部，变质作用达到高温低压条件（８５０℃，５ｋｂａｒ），并受到了中级退变质作用。变质长英质岩石的常规多颗粒Ｕ－Ｐｂ、单颗粒锆石Ｐｂ逐层蒸发法和Ｓｍ－Ｎｄ同位素年代学研究表明，至少具下元古界年龄的基底是在约５     

扬子地台西缘丹巴、康定、雅江变质体研究新进展

在四川的扬子地台西缘南段，自丹巴、康定、经雅江、冕宁至木里地区，一系列穹隆状变质地体呈南北向串珠状展布，并赋存有丰富的贵金属、多金属和稀有金属矿产，引起人们十分重视。自1991年8月．已被列入“八·五”地矿部攻关项目-《扬子地台西南缘有色贵金属成矿条件及远景预测》的二级课题，     

元古代北京裂谷槽中钾质碱性火山—深成作用

北京东部密云－平岩－带，受中元古代拉张性断裂控制，裂谷断陷区内的大红峪组钾质碱性玄武质与响岩质火山岩在时间及空间上与侵入相球斑花岗岩－辉绿岩共生。它们具有相似的板内碱性玄开岩和Ａ型花岗岩的同位素及地球化学特征。双峰式铁镁质及硅铝质岩浆是上地幔及下地壳更低程度部分熔融产物。     

陕西宝鸡高家村—高店断裂的初步研究

通过大比例尺活动断裂地质填图，查明了宝鸡高家村──高店断裂的几何展市及内部结构特征。在多处发现断层露头剖面，断层错断了晚更新世和全新世沉积物，反映出断层具有很新的活动性。     

Seasonal variability in the concentrations of Irgarol 1051 in Brighton Marina,UK; including the impact of dredging

Variations in Irgarol 1051 concentrations in the UK's largest marina at Brighton were determined regularly over a period of one year. Aqueous concentrations ranged from <1 to 960 ngl(-1) with highest mean concentrations generally associated with berths for larger vessels and with the main channels. Temporally, highest concentrations were recorded in November through to January and were probably associated with maintenance of vessels in an adjacent boatyard. Elevated levels were also encountered at the beginning of the season, coinciding with the introduction of newly antifouled vessels. Increased concentrations also followed dredging, possibly through re-mobilisation of Irgarol 1051. No correlations were found between dissolved Irgarol 1051 concentrations and pH, temperature or salinity. With the exception of sporadically high concentrations recorded for water samples (probably taken in close proximity to recently antifouled vessels), concentrations rarely exceeded the no observed effect concentration for marine periphyton of 63 ngl(-1). Concentrations of Irgarol 1051 in sediments sampled from the marina ranged from <1 to 77 ngg(-1). Apparent distribution coefficients (K(d)) calculated from sedimentary and aqueous samples (collected simultaneously) are generally within the range of K(d)'s reported from laboratory experiments.     

英国天然气安全:该严肃对待了

一、英国天然气开发与贸易———历史背景　　上世纪 60年代中期北海发现天然气 ,加上其后英国天然气管网的改向和大范围扩张 ,使英国国内资源基础的充足程度与潜在的市场规模之间的关系变得扑朔迷离。由于上述原因及其他一些原因 ,早期英国天然气以进口为主。 1 964年少量阿尔