共查询到16条相似文献,搜索用时 78 毫秒
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自然重砂测量是矿产勘查的重要手段之一。如何充分提取自然重砂测量数据所蕴涵的矿化信息,发挥其在矿产资源调查中的作用是一个现实问题。重矿物的被剥蚀、再沉积是自然重砂异常形成的重要过程。在充分考虑自然降水的汇集路径的前提下,以汇水区域边界确定范围是对自然重砂异常客观的解释。区域成矿模式研究、地球化学和人工重砂资料对自然重砂测量数据应用是重要的补充。笔者通过蔚县地区1∶20万自然重砂测量数据的分析,对其中有关全面认识异常、合理确定异常、勘查方法的综合应用、软件平台的使用及在矿产开发程度较高地区寻找未知资源的途径等方面做了一些探讨和尝试。 相似文献
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江苏宁芜北段自然重砂异常特征及其对铜金矿的响应 总被引:2,自引:0,他引:2
宁芜火山岩盆地是长江中下游成矿带中重要的铁、硫、铜、金成矿区。基于宁芜北段自然重砂建库数据,通过ZSAPS2.0软件GIS平台,选择与火山热液充填型铜金矿相关的特征矿物,圈定了自然重砂组合异常。通过自然重砂组合异常特征发现,铜矿物(黄铜矿、斑铜矿、蓝铜矿、辉铜矿、孔雀石)、自然金、黄铁矿、重晶石等重矿物组合对火山热液充填型铜金矿响应明显。在组合异常的基础上,圈定自然重砂综合异常,以成矿地质条件、与已知矿床的对应关系、异常强度、异常规模、重砂异常套合程度等为指标,对综合异常进行评价,从而为宁芜火山岩盆地北段铜金矿找矿远景区的划定提供依据。 相似文献
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通过全国资源潜力评价,结合各省自然重砂资料和全国重砂资料汇总成果,对85个常见自然重砂矿物进行统计分析。研究表明,中国自然重砂矿物复杂多样,重砂矿物分布具有明显的区域性特点。造山带中自然重砂矿物产出数量相对较多且密度较大,而稳定地区重砂矿物相对较少。不同的自然重砂矿物及其组合具有明显的找矿信息,单矿物自然重砂可能来源于相对单一的矿石或岩石,其异常范围表明与其相关的矿产可能具有较好的成矿远景;矿物组合常显示出有关矿床的成因信息。自然重砂矿物与源区岩石或矿石具有密切的成因联系,对指导矿产勘查与研究具有十分重要的意义。 相似文献
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滇东罗平县雄武镇地区遥感蚀变信息提取及成矿预测 总被引:1,自引:0,他引:1
以含铁矿物和含羟基矿物在ETM数据的可见光-短波红外波段所具有的特征光谱为依据,在滇东雄武镇地区采用主成分分析的方法,选择适宜的主分量图像,对其进行均值滤波、密度分割等处理,获得了高值级、中值级和低值级3种级别的铁化和泥化蚀变异常信息。结合成矿地层、成矿构造、地球化学异常、重砂异常等多元信息,进行遥感成矿预测,提出铜钼汞和铜钼Ⅰ级成矿预测区各1个、铜锌Ⅱ级成矿预测区1个、锌砷锑和铁铜Ⅲ级成矿预测区各1个,从而为该区进一步开展普查找矿指出了方向。 相似文献
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恬矿库周围土壤中重金属存在形态特征研究 总被引:48,自引:4,他引:44
通过对大冶铜绿山铜铁矿尾矿库周围土壤中重金属形态分析实验,研究了重金属各种形态在土壤中的分布特征。由对比实验可知,尾矿库周围土壤中Cu、Pb、Zn、Cd等重金属含量都显著地高于对照样品,书经受到重金属的严重污染。土壤中重金属形态分布征为:w(Cr、Zn、Fe);可变换态〈碳酸盐态〈有机态〈铁锰氧化态〈残渣态;w(Cu、Pb):可变换态〈碳酸盐态〈有机态〈残渣态〈铁锰氧化态;w(Cd):残渣态,有机 相似文献
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Several pilot studies were made in a PGE-mineralized area of central Madagascar in order to compare Pt,Pd halos in heavy mineral concentrates and to select the most suitable stream-sediment fractions, sampling densities and anomaly thresholds for regional PGE surveys. Results show low anomaly thresholds for Pt (30 ppb) and Pd (20 ppb) in the −63 μm fractions of the active sediment, with restricted halos of nearly 300 m for Pt and nearly 500 m for Pd. Using a slightly coarser fraction (−125 μm) increases the anomaly contrast. The Pt anomalies in heavy mineral pan concentrates are considerably enhanced (400–1,000 ppb) but occur further downstream in residual terraces. A regular increase in the weight of the heavy mineral concentrate for a given volume of sediment is noticed downstream. A simple weight correction of the raw Pt grade in the heavy mineral concentrate gives a better definition of the mineralized source upstream. Assessment of the corrected heavy mineral concentrate Pt anomalies together with Pt,Pd anomalies in the finest stream-sediment fraction produces the optimum definition of the target. Optical determination and scanning electron microscope studies of the PGM show sperrylite to be the major Pt-bearing mineral in the stream sediment, whereas the Pd mineralogy remains unresolved. Pt dispersion appears to be a predominantly mechanical process and Pd dispersion a chemical process with deposition controlled mainly by MnO scavenging. 相似文献
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Anna Worobiec E. Anna Stefaniak Sanja Potgieter-Vermaak Zbigniew Sawlowicz Zoya Spolnik René Van Grieken 《Applied Geochemistry》2007
The effectiveness of electrostatic separation of zircon and TiO2 phases during the processing of heavy mineral concentrates derived from heavy mineral sands depends upon the chemical, physical and mineralogical characteristics of the concentrates. Here the authors’ demonstrate the use of combined micro-Raman spectrometry (MRS), scanning electron microscopy (SEM) and computer controlled scanning electron microscopy coupled with an energy-dispersive X-ray detector (CC-SEM/EDX), followed by hierarchical cluster analysis (HCA) to determining these characteristics on samples from the non-magnetic fraction of the Richards Bay (South Africa) heavy mineral concentrate. All samples were found to be predominately comprised a heterogeneous population of grains of zircon and rutile and other TiO2 polymorphs with diverse physicochemical properties. Combined MRS and CC-SEM/EDX enabled the identification of textural characteristics which impacted on the efficiency of electrostatic separation of zircon and rutile concentrate streams. 相似文献