(1. 中南大学 有色金属成矿预测教育部重点实验室，长沙 410083；
2. 中南大学 地球科学与信息物理学院，长沙 410083；
3. 青海省第四地质矿产勘查院，西宁 810029；
4. 青海省环境地质勘查局，西宁 810007)
摘 要: 青海省肯德可克多金属矿床位于祁漫塔格成矿带，矿床产出的大地构造背景为柴达木南缘弧后裂陷构造带中的火山盆地。结合矿床地质成矿条件，通过现场调查，对矿区典型的岩浆岩、围岩及矿石进行了化学全分析、稀土和微量元素分析及铅同位素分析，总结了矿床地球化学特征，查明物质来源，探讨矿床成岩、成矿机制。结果表明：矿区岩体富钠，为钙碱性岩，来源于深部，后期发生混染，为壳幔混合来源。围岩稀土元素分析表明：成岩过程有海水参与，矿床具热水喷流沉积特征。各类矿石铅同位素的μ值介于9.45~9.75之间，具有深源铅和壳源铅特征。铅同位素特征参数示踪、铅构造模式示踪和Δβ-Δγ 图解示踪的结果表明：铅来源受岩浆作用影响，主要为壳幔混合铅。岩浆岩、围岩及矿体地球化学特征表明：肯德可克多金属矿床形成过程受海水影响，具热水喷流沉积特征，成岩成矿物质来源深部，受多源混染影响；矿床演化史漫长，从早期热水喷流沉积到的晚古生代的构造—岩浆活动，深化及扩大了成矿体系，晚期热液活动又对矿床进行了叠加改造，具多因复成特征。
关键字: 地球化学；成矿作用；铅同位素；肯德可克；祁漫塔格
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Fourth Institute of Qinghai Geological Mineral Prospecting, Xining 810029, China;
4. Environmental Geological Exploration Bureau of Qinghai Province, Xining 810007, China）
Abstract:Kendekeke polymetallic deposit is located in Qimantage ore belt of Qinghai Province and the background of this deposit is a volcanic basin in the back-arc rift tectonic zone of southern margin of Qaidam. Combined with field investigation and ore-forming geological conditions, the geochemical characteristics of deposit were summarized, the origin of the ore-forming materials was ascertained, the rock-forming mechanism and ore-forming mechanism of the deposit were discussed according to the study of lead isotope as well as chemical analysis, including whole-rock analysis，REE analysis and trace elements analysis. Typical magmatic rocks，wall rocks and ores were used as the research objects. The results show that magmatic rocks belong to calc-alkaline series, rich in sodium and derived from the source of crust-mantle mixed deep in the earth. The REE studies of wall rocks indicate the seawater involved in diagenesis and the deposit with characteristics of exhalative sedimentary deposit. The lead isotope research illustrates theμ values of minerals range from 9.45 to 9.75, which are characterized by both deep-sourced and crust-sourced origins. Based on the tracer analysis regarding the characteristic parameters, lead composition model and Δβ—Δγ diagram, the results show that the ore lead mainly is crust-mantle mixed lead and affected by magmatism during the enrichment process. The geochemical properties of magmatic rocks，wall rocks and ore reveal that Kendekeke deposit was affected by seawater in the formation progress and has the properties of exhalative sedimentary deposit. The diagenetic materials and ore-forming material, which were affected by the mixing of multi-source, came from the deep of the earth. The deposit had a long evolution history, begun from the early exhalative sedimentation to Late Paleozoic tectonic-magmatic activities, deepened and expanded the mineralization system, and the late hydrothermal activities superimposed and reformed the deposit, which is a polygenetic compound deposit.
Key words: geochemistry; metallogenesis; lead isotope; Kendekeke; Qimantage
