智利中北部赛罗伊曼—月亮山—赛罗诺尔戴磁铁矿矿床地质特征与找矿标志

智利中北部的赛罗伊曼—月亮山—赛罗诺尔戴磁铁矿矿床位于智利海岸山带白垩纪铁矿带的北段,与安第斯构造旋回的早期(侏罗纪—早白垩世)伸展阶段有关,为形成在钙碱性岩浆弧环境中与安山岩地层有关的矿床.矿化过程伴随强烈的热液活动,形成块状、网脉状、浸染状磁铁矿化以及热液角砾岩和围岩蚀变.蚀变岩石围绕矿体呈现出矿物和地球化学分带特征,岩石在接近矿体的内带产生强烈的阳起石化,矿体的远端产生钠长石化,外带的硅化和电气石化叠加在阳起石化和钠化蚀变岩之上.矿体自外向内具有浸染状矿石—网脉状矿石—块状矿石的分带特征.矿床地质特征和矿化分带特征形成特定的磁、电综合地球物理异常特征,结合成矿地质特征和综合地球物理特征,有利于该类型大型隐伏矿床的勘查发现.     

刘园子煤矿立井凿井工作面预注浆技术的应用

刘园子煤矿在井筒施工中,采用工作面预注浆方法成功通过了白垩系砂砾岩涌水段。采用脲酫树脂加草酸加强型封堵液和普通硅酸盐水泥加XPM纳米灌注剂,分别处理主井和副井井筒,同时采取加密布孔、围幕注浆和加大压力等技术措施和手段,使凿井工作面预注浆取得了良好的效果,并对两种材料效果进行了对比分析。     

Evaluation of Groundwater Resources in Lower Cretaceous Aquifer System in Sinai

The Sinai Peninsula has an area of 61000 km² and its populationis about 325000. It is located in an arid area. Extensivedevelopment in the socio-economic, industrial and agriculturalis in process. Although Lower Cretaceous aquifer is the mostprospective aquifer in Sinai, it is not yet precisely evaluated.Spatially distributed areas of good groundwater quality suitablefor various types of development are not identified.The current article presents a comprehensive assessment of thehydrogeological information and hydrological data. Accordingly,three aquifer zones have been identified. Groundwater reserve wasestimated and groundwater balance has been developed. Developmentpotential was evaluated. Development criteria were proposed and applied.Suitable areas for domestic and irrigation purposes weredelineated. Results indicated that the aquifer contains 308 billion m³ ofgroundwater of which a considerable volume is of good quality. Bylowering the present water level some 200 meters, the aquiferyielded 3643 million m³, which is sufficient to supply thepresent rate of withdrawal for 445 years. The results are considered to be usefulfor preparing groundwater master plans in Sinai. Under the properwater management, Sinai could be self sufficient in satisfying itsdomestic water demand.     

南宁电厂白垩系碎屑岩的强度和变形特征研究

对国电南宁电厂新建工程场地白垩系下统上组(KC1)的泥质粉砂岩、含砾中至粗砂岩及砾岩的单轴抗压强度和变形破坏特征进行了较为详细研究,结果表明:三种碎屑岩的单轴抗压强度受岩石含水量的影响很大,天然状态下,泥质粉砂岩的单轴抗压强度最小,含砾中至粗砂岩与砾岩的差异不大,但三类岩石单轴抗压强度受含水量影响的敏感程度存在显著差异。     

负温下白垩系岩石的物理力学性能试验研究

 摘要：通过对常温（20℃）和负温（5℃~-15℃）下内蒙鄂尔多斯地区白垩系岩层的物理力学性能试验,获得了不同负温条件下岩石的单轴抗压强度、弹性模量、应力-应变关系曲线等力学性能,分析了单轴抗压强度与温度、含水率之间的相互影响关系,为内蒙鄂尔多斯地区白垩系地层的冻结法施工和井壁结构设计提供参考数据。     

西部白垩系富水基岩立井冻结压力实测研究

为了解决我国西部白垩系富水基岩冻结法凿井的技术难题,采用振弦式传感器对甘肃某矿风立井基岩冻结压力及界面温度进行实测分析,研究了凿井期白垩系基岩冻结压力的变化规律、成因及不均匀性等。结果表明:凿井期间冻结压力分为快速上升、急速增长、缓慢升高、趋于稳定4个阶段;在同一水平其具有明显的不均匀性,且影响因素较多;其最终稳定值达1.708~2.047MPa,小于西部基岩同深度最大理论经验值,也小于东部冲积层冻结压力上限值pω;两壁界面温度急速上升后快速降低,30 h内各点达最高温42.4~59.4℃,同一点处前后降温差高达51.86~71.3℃,极不利于冻结壁和井壁的安全稳定;沿用东部的设计方法和经验,导致井壁过厚,易因温度应力产生环向裂隙,故西部煤矿立井井壁结构设计和施工仍存在可优化空间。     

内蒙古二连盆地的构造反转历史

二连盆地中生代经历了复杂的发育历史 ,是一个多期叠加的盆地系统 ,它经历了早—中侏罗世的小规模断陷盆地 ;晚侏罗世的构造反转盆地 (伴随着强烈的火山作用 ) ;早白垩世的大规模断陷盆地及早白垩世晚期的构造反转等盆地发展阶段 ;晚白垩世以来本地区处于整体隆升状态