湖南郴州荷花坪锡多金属矿床地质特征

分析总结区内地层、构造、岩浆岩与矿床的关系,矿区有利赋矿层位为中泥盆统棋梓桥组底部不纯灰岩,NE向成矿构造发育,燕山期花岗质岩浆活动强烈,成矿地质条件非常有利。将荷花坪锡多金属矿床类型分为矽卡岩—锡石硫化物型、破碎带蚀变岩型、蚀变花岗斑岩型三种,其中泥盆统棋梓桥组底部不纯灰岩中的似层状矽卡岩—锡石硫化物型矿床规模巨大,找矿前景非常可观。     

Three-Gorges Reservoir ＂Aigae Bioom＂ Conditions——An investigation

The Three-Gorges Reservoir lies in the west of China where economic development is at low level. The construction of water conservancy cannot only boost economy of local agriculture, but also make local ecosystem become unstable in a period of time. The Three-Gorges Reservoir has begun storing water for 3 years from June 2003, ＂algae bloom＂ is a particular pollutant in the course of super water conservancy. By monitoring the disquisitive ＂algae bloom＂ in the Three-Gorges Reservoir, from points of view of circulation, water character, weather, temperature, abundant azote, abundant phosphor, accrue spend, pH, delay glide. It is confirmed that especially different interactional colligate courses including water character state of affairs, human character, physics chem. abc warfare course, sedimentation, adsorb and abc warfare, bring about ＂algae bloom＂. The conclusion shows that ＂algae bloom＂ happened in the Three-Gorges Reservoir is not only a simple physical-chemical process, but also an integrated process including water conservancy, literae humaniores, physics, chemistry, biologic deposition, absorption, release and decomposing. Peculiar hydrological regime of the reservoir is an important condition for ＂algae bloom＂. The depths in different positions are also unbalanced, making different vegetations of algae in different tributaries in the same season and air temperature,     

祁连山地震带地震活动特征及序列类型

祁连山地震带中强地震具有成组活动特征,震前地震活动图象表现为地震空区、前兆地震、区域地震活动增强等。地震空区以中期异常为主,中期向短期过渡的标志为空区边缘或内部出现前兆地震、空区停止围空1~3个月或空区内发生小地震而导致空区解体。前兆地震一般于震前1~6个月出现,多数前兆地震与主震之间距离小于30 km,震级差1.5~3.0。通过序列类型及参数的统计分析,为震后趋势判定提供了依据。     

CDSN: Present status and future development

Introduction At present, China Earthquake Administration (CEA), National Nature Science Foundation(NNSF) of China, Geological Survey (USGS), National Science Foundation (NSF) of UnitedStates and Incorporated Research Institutions for Seismology (IRIS) all support Sino-Americatechnical cooperation project— China Digital Seismograph Network (CDSN). Institute of Geo-physics, China Earthquake Administration (IGCEA) and Albuquerque Seismological Laboratory,Geological S…     

澜沧江流域地理信息处理与地貌形态特征分析

地貌作为自然环境的重要组成要素,它对地表生态环境及各种自然资源的形成与分布具有重要作用。本研究针对澜沧江流域特殊的自然地理环境,应用GIS与遥感图像处理技术方法,通过对澜沧江流域1∶25万数字高程模型数据与地表覆盖遥感数据进行处理,提取流域有关坡度、坡向、地形起伏度等地貌特征要素,并进行定位表达与特征统计分析,结果获得了对流域地貌特征的定位与定量化的总体认识,研究成果直接为澜沧江流域水、土、生物、矿产等资源的综合开发利用,特别是为流域水资源的分配及其综合开发利用研究提供空间信息基础平台。     

"意识形态"范畴新探

意识形态范畴的含混为讨论和研究带来诸多不便。“意识形态终结论”不过是西方资产阶级在意识形态领域散布的一股“烟雾”。所谓“意识形态”范畴 ,即指一定阶级基于自己特定的历史地位和根本利益 ,以理论形态表现的对现存的社会关系的思想、情感或行为准则的体系     

湘西铁路沿线红层边坡工程地质研究

地处湘西山区的湘黔、焦柳铁路沿线分布众多的红层边坡。因其工程地质条件的特殊性,边坡灾害时有发生,严重影响了列车的安全运行。文章首先对这一地区红层的工程地质特性进行研究,在此基础上,对边坡破坏形式、规律、机理等进行深入探讨。研究表明:分布在湘西铁路沿线的红层具有岩性多变、软硬互层、浸水崩解、遇水软化、结构面众多及泥化软弱夹层发育等工程特性;红层边坡变形破坏的主要形式有风化剥落、坡面变形、崩塌落石和顺层滑坡等。文章通过湘西湘黔、焦柳铁路沿线12处较大红层路堑滑坡的调查及综合分析,得出这一地区红层路堑滑坡形成的基本规律并根据滑坡体物质及滑动面特征对其进行了分类。分析了该地区红层滑坡的形成机理并提出红层边坡地质灾害的防治措施。     

雨谷井田地质构造特征及成因分析

贵州雨谷井田位于盘南背斜南东翼西段，是地质构造相对复杂、构造应力相对集中的部位。对井田内构造基本形态、断层发育特征、发育规律进行了深人的研究，对下一步的继续勘探及煤矿开采具有重要的意义。     

鱼卡煤田东部煤质特征及变质规律探讨

鱼卡煤田东部含煤地层为中侏罗统大煤沟组,属湖沼、湖滨相沉积,区内构造复杂,断层落差较大,煤岩类型以亮—半亮煤为主,表现为区域变质作用,变质程度由浅至深,由南向北逐渐增高。     

应用VB实现中线测量中任意点坐标的快速计算

根据带有缓和曲线的圆曲线的测设原理,应用了面向对象的VB语言,设计了曲线主点(五大桩)与细部点(各中桩)的坐标检核,实现了中线测量中任意点坐标的快速计算。