河北某铁矿破碎带沉积物粒度特征及水动力条件分析  

Analysis of grain size characteristics and hydrodynamic conditions of sediments in an iron ore crushing zone in Hebei Province

作　　者：贺海飞 董博萧 王岩 HE Hai-fei;DONG Bo-xiao;WANG Yan(School of Emergency Management and Safety Engineering,North China University of Science and Technology,Tangshan 063000,China)

机构地区：[1]华北理工大学应急管理与安全工程学院,河北唐山063000

出　　处：《地下水》2025年第1期11-14,25,共5页Ground water

摘　　要：河北某邯邢式接触交代矽卡岩型变质铁矿床,矿区地下水具有丰富的动、静储量,矿区水文地质条件较为复杂。本文以该矿区内-170m水平附近的6个探矿钻孔为研究对象,在对矿区探矿孔岩心进行详细编录的基础上,采集破碎带内破碎及泥化严重部位的粒度样品共10件,采用筛分-激光联合分析法进行粒度分析,对其相应的频率直方图、概率累计曲线图、粒度参数、C-M图特征进行研究,明确围岩破碎带分布特征及破碎带沉积物沉积环境及水动力条件。结果表明:各破碎带及泥化带中的沉积物粒径直径分布范围在较广,沉积物平均粒径平均值处于细砂范围内,多数样品频率曲线呈双峰形态分布,少数呈左偏单峰形态,沉积物碎屑颗粒的分布为正偏至极正偏,分选程度为较差至差,峰度多数为宽至中等,总体与河流冲击沉积物的粒度特征吻合。沉积物多以滚动搬运及悬浮沉积为主,具有较强的牵引流及浊流沉积的特征,总体而言,各破碎带及泥化带沉积物所处的沉积环境水动力条件都普遍较强。此外,钻孔中一些取样位置相近且粒度特征及水动力条件极其相似的位置,其破碎带贯通的可能性相对较大,应在矿山生产建设中给与足够的重视。该研究结果可为矿区围岩破碎分布及矿山生产及水害防治提供一定的参考价值。A Hanxing type contact metasomatic skarn type metamorphic iron deposit in Hebei Province has rich dynamic and static reserves of groundwater and complex hydrogeological conditions.In this paper,6 exploration holes near the-170m level in the mining area are taken as the research object.On the basis of detailed cataloguing of the core of the exploration holes in the mining area,10 particle size samples from the severely broken and pellized parts in the crushing zone are collected,and the particle size analysis is carried out by sieving and laser combined analysis method.The corresponding frequency histogram,cumulative probability curve,particle size parameter and C-M diagram are studied to determine the distribution characteristics of the broken zone of surrounding rock,the sedimentary environment and hydrodynamic conditions of the broken zone.The results show that:The grain diameter of sediments in each fracture zone and pelitizing zone has a wide distribution range,and the average grain diameter of sediments is within the range of fine sand.The frequency curve of most samples presents a bimodal distribution,while a few present a left-sided unimodal distribution.The distribution of sediment detritus particles is positive to extreme positive bias,the sorting degree is poor to poor,and the kurtosis is mostly wide to medium.In general,it is consistent with the grain size characteristics of fluvial impingement sediments.The sediments are mainly carried by rolling transport and suspended sediment,with strong characteristics of traction flow and turbidity current deposition.In general,the sedimentary environment of the sediments in the broken zone and argillation zone are generally strong hydrodynamic conditions.In addition,some locations with similar sampling locations,particle size characteristics and hydrodynamic conditions in the borehole have a relatively large possibility of penetrating the fracture zone,which should be given sufficient attention in mine production and construction.The research results can provide

关 键 词：粒度分析 水动力条件 筛分-激光联合法:水害防治 

分 类 号：P641.2[天文地球—地质矿产勘探]