西藏隆桑矿区土壤地球化学异常特征及找矿方向

    Soil geochemical anomalies and prospecting targets of the Longsang mining area, Tibet

    • 摘要: 西藏隆桑矿区位于冈底斯成矿带东段,具有良好的成矿地质背景及成矿地质条件。为指导隆桑矿区找矿勘查工作部署,通过EDA法探讨了隆桑矿区1∶10000土壤地球化学测量结果中Cu、Mo、Au、Ag、Pb、Zn等13种元素的异常特征,结果表明,矿区主要成矿元素Cu、Mo呈现强富集、强变异特征,具有较大的成矿潜力和找矿前景;根据土壤地球化学综合异常结果,共圈定异常区2个,其中J1异常区位于矿区中西部,规模大,Cu、Mo异常元素套合较好,J2异常区位于矿区中南部,区内异常元素以Cu为主,Mo异常不显著。对J1、 J2异常区开展工程验证,部署钻探工程初步揭露了J1异常区的深部铜钼矿体,提出J1异常区的北西向矿体倾斜方向深部以及矿体NE-SW走向方向,是未来隆桑矿区的重点找矿区域,本次研究成果为矿区进一步的找矿工作部署提供了科学依据。

       

      Abstract: The Longsang mining area in Tibet, located in the eastern section of the Gangdese metallogenic belt, boasts favorable geological settings and conditions for mineralization. To guide mineral exploration and prospecting in the mining area, this study investigated the anomalous characteristics of 13 elements (e.g., Cu, Mo, Au, Ag, Pb, and Zn) in the 1∶10000 soil geochemical survey results using exploratory data analysis (EDA). The results of this study indicate that the primary ore-forming elements, Cu and Mo, in the mining area show strong enrichment and considerable variation, suggesting great metallogenic potential and promising prospects for ore exploration. Based on the soil geochemical integrated anomalies, two anomaly zones were delineated: J1 and J2. The J1 anomaly zone is distributed in the west-central part of the mining area, displaying a large scale and a high degree of overlap between Cu and Mo anomalies. In contrast, the J2 anomaly zone is located in the south-central part of the mining area. In this zone, Cu predominates among anomalous elements, while Mo anomalies are nonsignificant. Engineering verification was carried out for the two anomaly zones. Drilling engineering preliminarily revealed the presence of deep Cu-Mo ore bodies in the J1 anomaly zone. It is proposed that the deep part of the area along the dip direction of the ore body in the northwestern part of the J1 anomaly zone and the NE-SW strike of the ore body are key prospecting targets in the Longsang mining area. The results of this study provide a scientific basis for further prospecting arrangement in the mining area.

       

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