(1. 中南大學(xué) 有色金屬成礦預(yù)測與地質(zhì)環(huán)境監(jiān)測教育部重點實驗室，長沙 410083； 2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083； 3. 貴州省有色金屬和核工業(yè)地質(zhì)勘查局，貴陽 550005)
摘 要: 大壟鉛鋅礦床位于湘東新華夏構(gòu)造體系中坊樓北北東向構(gòu)造帶中部南東側(cè)，鄧阜仙復(fù)式巖體北端，礦體受南北向斷裂控制。通過電子探針、流體包裹體和S、Pb、H、O同位素研究，分析礦床的成礦物質(zhì)來源、成礦物理化學(xué)條件，探討礦床成因及成礦過程。結(jié)果表明：礦床的形成與燕山期巖漿活動密切相關(guān)，成礦物質(zhì)具有殼幔混合的特征，成礦流體主要源于巖漿水，有大氣降水的加入；成礦溫度屬于中低溫，成礦初期流體處于弱堿性、弱氧化的環(huán)境，后期向低溫、低氧逸度、低硫逸度的環(huán)境轉(zhuǎn)換，成礦深度為中深成。綜合認(rèn)為大壟鉛鋅礦床屬于與燕山期巖漿活動有關(guān)的中低溫?zé)嵋恒U鋅礦床。
關(guān)鍵字: 電子探針；流體包裹體；同位素；成礦機(jī)理；大壟鉛鋅礦床
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Changsha 410083, China; 2. School of Geoscience and Info-Physics, Central South University, Changsha 410083, China; 3. Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Guiyang 550005, China）
Abstract:Dalong Pb-Zn deposit is located in the southeast of the middle Fanglou NNE structural belt of Neocathaysian structural system and the north head of the Dengfuxian composite granite. Ore occurrence is controlled by south-north faults. Through the electron microprobe analysis, fluid inclusions and S, Pb, H, O isotope characteristics research, the source of ore-forming materials, ore-forming physicochemical conditions were analyzed, and the ore deposit genesis and metallogenic process were discussed. The results indicate that the formation of ore bodies is closely related to the Yanshanian magmatic activity; the ore-forming materials have the feature of crust-mantle mixing; the ore-forming fluid is mainly derived from magmatic water, but with the mixing of atmospheric precipitation; the metallogenetic temperature is low-medium temperature; the ore-forming fluid is weak alkali, weak oxidizing environment, and late it transforms to low temperature and low oxygen fugacity of low sulfur fugacity environment; the metallogenetic depth is shallow-moderate depth. Dalong Pb-Zn deposit belongs to low-medium temperature magmatic hydrothermal deposit relating to the Yanshanian magmatic activity.
Key words: electronic mircoprobe？ fluid inclusion？ isotope？ metallogenic mechanism？ Dalong Pb-Zn deposit
