Discussion on Metallogenic Characteristics and Genesis of Nongtun Lead-Zinc Deposit in Xidamingshan Polymetallic Ore Concentration Area, Guangxi
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摘要:
这是一篇地球科学领域的论文。西大明山多金属矿集区是广西矿产资源勘查重点关注地区，在大规模找矿工作的推动下，新发现了弄屯大型铅锌矿床，目前对该矿床的成矿特征尤其矿床成因方面的认识仍停留在表象阶段。为了查明弄屯铅锌矿床的成矿机制，本文在详细的野外地质调查和前人工作基础上，系统总结了弄屯铅锌矿床的区域成矿地质背景、矿区和矿床地质特征，分析矿床成因。研究表明：弄屯铅锌矿床属于岩浆热液型矿床，其成矿流体起源于岩浆流体，后期混入大气降水，流体在长距离运移途中萃取了地层中的Pb、Zn等矿质元素，并与来自岩浆流体的S结合形成 [HS]-配位体络合物，在断裂带中汇聚并向浅部运移，进而形成脉状铅锌矿体。鉴于此，本文建立了弄屯铅锌矿床的成矿模式，为今后的找矿勘查工作提供必要的思路和依据。
Abstract:This is an article in the field of earth sciences. Xidamingshan polymetallic ore concentration area is critical mineral prospecting district in Guangxi. With the promotion of the large-scale mineral breakthrough work, the Xidamingshan mineral exploration, the Nongtun large-scale Pb-Zn deposit has been newly discovered. However, the understanding of the metallogenic characteristics of the deposit, especially the genesis of the deposit, is still at the superficial stage. Based on detailed field geological investigations and previous work, this paper systematically summarizes the regional metallogenic geological background, mining area and geological characteristics, and analyzes the genesis of the Nongtun lead-zinc deposit to find out the metallogenic mechanism. The study shows the Nongtun Pb-Zn deposit is related-magmatic hydrothermal deposit, the ore-forming fluids originated from magmatic, and later mixed with meteoric water. The fluids extracted Pb and Zn ore-forming elements from the strata during long-distance transport, and combined with S of magmatic fluids to synthesize [HS]-ligand that converged in the fracture zone and transported to the shallow part, thus forming Pb-Zn ore vein. The above research results have established the metallogenic model of the Nongtun Pb-Zn deposit, which provides a good guidance for prospecting prediction and exploration.
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表 1 弄屯铅锌矿床成矿阶段矿物共生组合
Table 1. Mineral paragenetic association in the metallogenic stage of Nongtun Pb-Zn deposit
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