西藏谢通门县雄村矿集区及其外围水系沉积物地球化学特征及异常评价
Geochemical characteristics and anomaly assessments of stream sediments in the Xiongcun ore concentration area and its periphery, Xietongmen County, Tibet
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摘要: 为研究位于冈底斯成矿带中段的雄村矿集区及其外围的成矿元素分布特征及地球化学异常,指导雄村矿集区及外围的找矿勘查工作部署,推动雄村大型铜金资源基地建设,开展了雄村矿集区及外围的1∶50 000水系沉积物地球化学异常评价工作,查明了该区Cu、Au、Pb、Zn、Ag共5种元素的地球化学异常分布特征及富集规律。根据元素异常分析结果,结合研究区地质特征,圈定综合异常区,开展了异常区查证工作,对研究区找矿潜力进行评价。研究结果表明,Cu、Au是研究区的主要成矿元素,呈现强富集、强变异特征,具有较大的成矿潜力和找矿前景;共圈定水系沉积物地球化学综合异常区4个,其中HS-1和HS-2综合异常套合好,有已知矿床(点)分布或矿化显示较好,具有较大的找矿潜力。本次研究为雄村矿集区及其外围的地质找矿提供了地球化学依据,为研究区下一步的矿产勘查方向提供了思路与参考。Abstract: The Xiongcun ore concentration area in Xietongmen County, Tibet, is situated in the central segment of the Gangdise metallogenic belt. This study aims to investigate the distribution characteristics and geochemical anomalies of ore-forming elements in the study area and its periphery. This will guide the deployment of mineral exploration work in the study area and its periphery and promote the construction of the Xiongcun large-scale copper-gold resource base. Through the assessment of 1∶50000 stream-sediment geochemical anomalies in the study area and its periphery, this study determined the geochemical anomaly distributions and enrichment patterns of five elements (i.e., Cu, Au, Pb, Zn, and Ag) in the study area. Based on the analytical results of element anomalies and the geological characteristics of the study area, this study delineated the composite anomaly zones in the study area. Furthermore, this study assessed the prospecting potential of the study area through follow-up geochemical surveys. The results indicate that Cu and Au serve as the principal ore-forming elements in the study area. Both elements are characterized by strong enrichment and strong variability, showing high mineralization and prospecting potential. Four composite geochemical anomaly zones of stream sediments were identified. Among them, zones HS-1 and HS-2 exhibit highly consistent composite anomalies. Both zones show the distribution of known ore deposits (occurrences) or significant mineralization shows, suggesting considerable potential for ore prospecting. Overall, this study provides geochemical evidence for geological prospecting in the Xiongcun ore concentration area and its periphery while also offering ideas and a reference for subsequent mineral exploration targets in the study area.
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