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黑龙江省呼玛县小金场地区土壤地球化学特征及找矿潜力分析

Analysis of soil geochemical characteristics and prospecting potential in Xiaojinchang Area, Huma County, Heilongjiang Province

  • 摘要: 小金场地区位于韩家园子Fe、Au成矿亚带东段,具备良好的成矿地质条件与找矿前景。为快速圈定找矿靶区并明确找矿方向,在小金场地区开展了1∶10 000土壤地球化学测量工作,对地球化学特征进行了系统分析,重点研究了元素分布特征及异常特征。依据Au、Ag、Cu、Pb、Zn等5种成矿元素的测试数据,开展了相关性分析、聚类分析、单元素异常分析及综合异常分析,共圈定单元素异常51处,综合异常4处。结合野外地质调查,初步评价了区域找矿潜力。结果表明:Au、Ag异常具有异常值高、规模大、浓集中心明显等特征,组合异常套合良好,是有利成矿元素;根据元素组合特征与成矿地质条件,判定Ⅱ、Ⅲ、Ⅳ号组合异常为矿致异常,并优选为找矿靶区;综合控矿因素分析认为,兴华渡口群地层是重要的矿源层,其与中奥陶世花岗闪长岩接触带及断裂发育处为矿化有利地段。研究结果为小金场地区下一步矿产勘查提供了科学依据。

     

    Abstract: The Xiaojinchang Area is located in the eastern segment of the Hanjiayuanzi Fe-Au metallogenic sub-belt, possessing favorable metallogenic geological conditions and prospecting potential. A 1∶10 000 soil geochemical survey was conducted in the Xiaojinchang Area to rapidly delineate prospecting targets and clarify prospecting directions, with systematic analysis conducted on its geochemical characteristics and a focus on element distribution patterns and anomaly characteristics. Based on test data for five metallogenic elements (Au, Ag, Cu, Pb, and Zn), correlation analysis, cluster analysis, single-element anomaly analysis, and integrated anomaly analysis were performed. A total of 51 single-element anomalies and four composite anomalies were delineated. Preliminary evaluation of the regional prospecting potential was conducted by combining field geological surveys. The results indicate that Au and Ag anomalies are characterized by high anomaly values, large scales, and prominent concentration centers, with well-overlapping composite anomalies, indicating that they are favorable metallogenic elements. Based on element association characteristics and metallogenic geological conditions, composite anomalies No. Ⅱ, Ⅲ, and Ⅳ were identified as ore-induced anomalies and prioritized as prospecting targets. Comprehensive analysis of ore-controlling factors suggests that the Xinghuadukou Group strata serve as an important source bed, with the contact zones with Middle Ordovician granodiorite and fracture-developed areas being favorable sites for mineralization. The findings provide a scientific basis for further mineral exploration in the Xiaojinchang Area.

     

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