Extracting geochemical anomalies from geochemical exploration data is one of the most important activities in mineral exploration. Geochemical anomaly detection can be regarded as a binary classification problem. The similarity between geochemical samples can be measured by their distance. The key issue of this classification is to find the intrinsic relationship and distance between geochemical samples to separate geochemical anomalies from background. In this paper, a hybrid method that integrates random forest and metric learning (RFML) is used to identify geochemical anomalies related to Fe-polymetallic mineralization in Southwest Fujian Province of China. RFML does not require any specific statistical assumption on geochemical data, nor does it depend on sufficient known mineral occurrences as the prior knowledge. The geochemical anomaly map obtained by the RFML method showed that the known Fe deposits and the generated geochemical anomaly area have strong spatial association. Meanwhile, the receiver operating characteristic curves for the results of RFML and another method, namely maximum margin metric learning, indicated that the RFML method exhibited better performance, suggesting that RFML can be effectively applied to recognize geochemical anomalies.
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经过对哈啦河铅锌矿区1:20000土壤地球化学测量资料的处理,圈定了大量元素异常,再用R型因子分析,划分元素组合。从元素组合分布特征方面分析,评价异常找矿意义,确定4个找矿远景区,并圈定1号异常区为最佳找矿靶区,并经钻探发现了工业矿体,2号异常区有待进一步地质工作。 相似文献
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高家金多金属矿地处江西东乡地区,属江南地块与华夏地块结合处,地质构造复杂,成矿条件良好。为了解该区第四系及其他覆盖层下是否存在与金多金属矿体相关的隐伏岩体（磁性矿体）,在此处开展高精度磁测与激电测量勘查工作。勘查结果显示,东乡金多金属矿勘查区中酸性岩体可能是虎圩石英闪长玢岩体的西延部分,主体赋存部位对应于勘查区磁异常产出地。区内地质体电异常（视极化率）规模虽小但强度较大,分布较广,周边已有矿山所见矿体及黄铁矿化与该岩体关系密切,综合分析勘查区周边已知矿（矿化）体成因及赋存部位,定性认为该区磁异常附近磁场梯度带、北东部近南北向视电阻率梯度带及局部视极化率异常分布区应为勘查区找矿远景部位。 相似文献
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勘查区利用常规地质方法寻找石墨矿难度较大.区内含石墨矿地层与围岩存在明显的电性差异,因此开展综合物探找矿具备电法找矿的前提条件.勘查区圈定激电异常2处,优选1处异常进行激电测深工作进一步查证,提出验证孔1个.经钻探验证,见4.54m厚的石墨矿体,证明了综合电法在凤阳浅覆盖区石墨矿产勘查中的有效性. 相似文献
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安徽池州白虎山地区属长江中下游铁铜硫金成矿带、沿江铜金硫铁成矿亚带,位于贵池成矿区东南部铜铅锌金多金属成矿远景区。区内地质构造复杂,成矿条件良好,矿产主要与侵入岩有关。为进一步查明矿（化）体成因,在该区开展高精度磁测与CSAMT勘探工作,结果显示,磁异常区域主要为三处,主体侵入部位对应勘查区北部C2、C3磁异常,认为C2、C3磁异常南侧和C1异常化极后显现的各主要局部异常分布区域应为勘查区找矿远景部位,CSAMT测量结果反映勘查区垂向地质体分布特征,有效划分了蚀变带,与磁异常结果对应关系较好,在推断的蚀变带位置均显示明显的磁异常,可为勘查区找矿工作提供依据。 相似文献
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常规化探异常信息识别通常都是通过对比观测值与某一异常阈值的高低来判定某样品是否为异常样品,很多方法或者建立在经典统计学基础之上,要求数据符合一定的分布形式,或者面向整个研究区计算异常阈值,而无法顾及实际的地质环境。根据常规方法以数值大小计算异常阈值的原则,并且关注化探数据分布特征信息的分析和挖掘,提出了晕状特征提取方法,该方法能够有效识别局部异常及低缓异常。将此方法用于克拉玛依地区对金矿预测具有指示意义的化探数据的异常信息识别工作,结果表明:该方法能够有效识别化探异常信息,这些异常信息与研究区内已知金矿具有很好的对应关系。晕状特征提取方法在新疆东部的应用案例也显示出较好的结果。该方法可以作为一种有效的化探异常信息识别方法应用于成矿预测实际工作中。 相似文献
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A number of large and giant ore deposits have been discovered within the relatively small areas of lithospheric structure anomalies, including various boundary zones of tectonic plates. The regions have become the well-known intercontinental ore-forming belts, such as the circum-Pacific gold–copper, copper–molybdenum, and tungsten–tin metallogenic belts. These belts are typical geological anomalous areas. An investigation into the hydrothermal ore deposits in different regions in the former Soviet Union illustrated that the geologic structures of ore fields of almost all major commercial deposits have distinct features compared with the neighboring areas. These areas with distinct features are defined as geo-anomalies. A geo-anomaly refers to such a geologic body or a combination of bodies that their composition, texture–structure, and genesis are significantly different from those of their surroundings. A geo-anomaly unit (GU) is an area containing distinct features that can be delineated with integrated ore-forming information using computer techniques on the basis of the geo-anomaly concept. Herein, the GU concept is illustrated by a case study of delineating the gold ore targets in the western Shandong uplift terrain, eastern China. It includes: (1) analyses of gold ore-forming factors; (2) compilation of normalized regional geochemical map and extraction of geochemical anomalies; (3) compilation of gravitational and aeromagnetic tectonic skeleton map and extraction of gravitational and aeromagnetic anomalies; (4) extraction of circular and linear anomalies from remote-sensing Landsat TM images; (5) establishment of a geo-anomaly conceptual model associated with known gold mineralization; (6) establishment of gold ore-forming favorability by computing techniques; and (7) delineation and assessment of ore-forming units. The units with high favorability are suggested as ore targets. 相似文献
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上西坑钼矿位于福建省武夷山市五夫镇境内,矿区内已发现6个钼矿（化）体（Ⅳ1-Ⅳ6）,Ⅳ1矿体为主矿体,是主要开采对象。综合已有的地质、物化探资料分析,上西坑钼矿采矿证内及外围均具较好的找矿前景,科学开展外围探矿工作能以最小的投入获取最大的勘查成果,为矿山扩建提供后备资源保障以及开采技术条件等依据。 相似文献
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老挝万象盆地钾盐矿赋矿地层为古近系古新统塔贡组下岩段,为隐伏矿层,分布面积广,厚度大,品位高。由于受钾盐矿层沉积基底地形差异及矿层的后期改造,钾盐矿层局部缺失。在钻探揭露控制矿层前预测矿体的赋存位置,可有效节约探矿成本。根据万象盆地古近系古新统塔贡组石盐岩、钾镁岩矿与泥岩之间存在密度差,认为重力测量能够有效区分盐类矿层的埋深、厚度,而钾盐矿层往往赋存于古近系古新统塔贡组巨厚层石盐矿层上部,重力负异常与钾盐矿层的对应性好,是钻探验证首选区域和万象盆地钾盐矿勘查较为有效的物探方法。 相似文献
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内蒙古呼伦贝尔东明露天煤矿矿坑边帮地下水渗漏的问题日益严重,矿区原有的疏干降水井排水能力及效果已不能满足生产需求,同时对矿区生态环境也造成一定程度破坏。目前,对矿区周边的水文地质条件和水力联系缺乏精准全面的认识和数据。本文通过瞬变电磁法对矿区地下水渗漏较严重的西北部进行三条勘探线(77个物理点)勘查,结果表明该区存在三处视电阻率低阻异常带,判定其主要为含水断层(裂隙)所致;结合矿区地形、地层岩性与矿区地下水矿化度,对上述异常带进行了科学合理的综合解释,并结合新施工的疏干降水井抽水验证了上述异常的可靠性,为矿区后期布置疏干降水井圈定了靶区,对当地同类型矿区地下水渗漏灾害治理起到了应用示范作用。 相似文献
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