内蒙古东部重力场特征以及寻找内生矿床的意义

依据岩石密度特征，应用布格重力异常资料，在内蒙古东部地区推断7个大型岩浆岩活动区（带）。这些岩浆岩活动区（带）控制着内蒙古自治区东部地区大部分内生矿床，也就是说每一个大型岩浆岩活动区（带）实际上是一个成矿系统。因此，应用布格重力异常资料可以推断岩浆岩活动区（带），预测内生矿床，筛选化探异常。     

Residual strength of slip zones of large landslides in the Three Gorges area, China

Slip zones of the large landslides in the Three Gorges area are commonly composed of fine-grained soils with substantial amount of coarse-grained particles, particularly gravel-sized particles. In this study, residual strength of the soils from slip zones of these landslides were examined in relation to their index properties based on a survey of 170 landslides. It was found that laboratory-determined residual friction angle using gravel-free fraction of the disturbed soils from the slip zones was closely related to clay content, liquid limit and plasticity index. On the other hand, in-situ residual friction angle of these soils (i.e. including gravel fraction) showed very weak correlations with clay content and Atterberg limits, but was largely dependent on gravel and fines (clays + silts) contents, increasing with gravels and decreasing with fines, and displayed strong linear correlation with the ratio of gravel to fines contents. These observations indicate that among the index properties, clay content and Atterberg limits can be used to estimate residual strength of the soils finer than 2 mm, but they are not appropriate evaluate the residual strength of the soils containing considerable amount of gravel-sized particles. For the latter, particle size distribution (particularly the ratio of gravel to fines contents) appears to be a useful index. Additionally, it was found that there was no identifiable correlation between relative abundance of individual major clay minerals and residual friction angles of both gravel-free fraction of disturbed and in-situ soils, suggesting that influence of clay minerals on residual strength of these soils can not be simply evaluated based on their abundance.     

宝山西部矿区砂页岩型铅-锌矿成矿地质特征及新区找矿预测

宝山西部矿区砂页岩型铅-锌矿是近年来探获的一种新类型铅-锌矿体,赋存在次级倒转背斜核部测水组砂页岩地层中,层间滑动带的虚脱空间是其容矿空间,断层规模决定其长度规模,矿体产状严格受构造控制。根据其成矿特征及成矿条件,利用类比法,预测新的找矿靶区。     

基于MAPGIS的皮帕尔图

皮帕尔图是常用的地下水化学分类方法,使用Mapgis编制的皮帕尔图,可以利用GIS的编辑和查询功能,使用更加方便,本文介绍了在Mapgis平台绘制皮帕尔图的步骤,并用该方法分析了天津地区的地下水化学类型,体现了使用GIS成图的优势。     

攀枝花宝鼎矿区地温研究

根据攀枝花宝鼎矿区＋900、＋700、＋500水平的地温分布特征,结合矿区地貌、水系、构造发育程度、地层岩性组合、覆盖层厚度、矿井采空区范围等条件,对该区深部地温的分布规律进行探讨研究,认为其热源可能来自岩浆余热,但地温异常与矿区各地质特征有关,为老矿区深部煤炭资源的开发,防治地热灾害提供了地温依据。     

河北省张家口金矿集区同位素及包裹体地质特征

张家口地区是我国重要的金矿集中区之一.自上世纪80年代以来,在崇礼县-赤城县毗邻地段的大型偏碱性二长岩杂岩体及其太古界中深变质岩系中,相继发现金矿田三个,探明金矿储量近100t.通过对该金矿集中区各类型矿床的大量同位素以及包裹体地质特征的研究,对该区金矿的成矿物质来源、矿床成因进行了探讨,这对于该区今后的金矿找矿工作具有实质性的指导意义.     

河北文安5.5级地震前天津地区流体短期前兆异常分析

以河北文安5.5级地震为例,分析了地震前天津地区流体测项的异常变化。结果表明,天津王3井、王4井水汞、潘庄井及双桥1井水位在震前都出现了明显的短期前兆异常。     

三维地震勘探激发参数选择与分析

文中介绍了山区进行三维地震勘探的重要性及其方法原理。以山西晋城煤业集团某勘探区为实例进行实地勘探和试验,并对试验结果进行了详细的分析,进一步验证了该方法的可行性。     

现行有关规范用于黄土地区的局限性分析

探讨了现行有关规范用于黄土地区存在的某些不足,阐明了场地条件和场地类别等因素对抗震设防参数的影响问题,强调了重视地方标准的制定的必要性。同时也展望了今后尚需开展的研究工作。     

甘肃礼县盐关井水位短临异常与滇北强震的关系

在分析了甘肃礼县盐关井水位20多年来的异常变化与邻近地区发生中强地震的对应关系基础上,着重就18年来井水位出现两次较大幅度的负异常与相距1000 km多的云南禄劝1985年6.1级地震和云南大姚2003年6.2级地震的对应关系进行了探讨,认为该井很可能是滇北两个震区强震的“穴位”和灵敏点。