(1. 中南大學(xué) 有色金屬成礦預(yù)測(cè)教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長(zhǎng)沙 410083)
摘 要: 為探究曲仁盆地北緣以凡口為代表的鉛鋅硫化物礦床的礦床成因，對(duì)該區(qū)礦石及與礦化有關(guān)的巖體做稀土元素地球化學(xué)特征研究。結(jié)果表明：黃鐵礦礦石和鉛鋅黃鐵礦礦石稀土元素球粒隕石標(biāo)準(zhǔn)化配分曲線均為富輕稀土右傾型，但大部分鉛鋅黃鐵礦礦石重稀土段曲線右傾程度明顯較低，說(shuō)明黃鐵礦礦化和鉛鋅礦化系具有不同的成礦過(guò)程，但存在物源繼承關(guān)系；Eu在鉛鋅礦床礦石中呈正異常，在黃鐵礦礦床礦石中呈低負(fù)異常，推測(cè)有偏酸性熱液參與鉛鋅成礦作用；∑REE在燕山期侵入巖中最高，在區(qū)域寒武系地層中次之，在鉛鋅黃鐵礦礦石中最低，推斷鉛鋅成礦構(gòu)造熱事件或巖漿熱事件引發(fā)了稀土元素活化遷移；礦石稀土元素的賦礦圍巖灰?guī)r、燕山一期花崗巖和中基性脈巖標(biāo)準(zhǔn)化配分曲線均顯示不同程度的平坦化，反映鉛鋅成礦物質(zhì)有多個(gè)來(lái)源；礦石與其他地質(zhì)體的REEQ型聚類結(jié)果表明賦礦碳酸鹽巖層是黃鐵礦礦化的主要成礦物質(zhì)來(lái)源，雖燕山一期花崗質(zhì)巖漿為鉛鋅礦化提供成礦物質(zhì)，但盆地基底碎屑巖層是主要成礦物質(zhì)來(lái)源，燕山中晚期中基性巖脈則參與了晚期鉛鋅成礦作用。
關(guān)鍵字: 凡口式鉛鋅硫化物礦床；稀土元素；配分模式；Q型聚類分析；兩期熱液成礦
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geoscience and Info-Physics, Central South University, Changsha 410083, China）
Abstract:Rare earth elements (REE) characteristics of ores and other geological bodies were investigated to probe the genesis of Fankou-type lead-zinc sulfide deposit in the northern margin of Quren basin. The results show that the chondrite-normalized REE patterns of pyrite ores and lead-zinc pyrite ores both are LREE-enriched right type, but HREE segment curve rightist degree of lead-zinc pyrite ores is lower, meaning that pyrite and lead-zinc mineralization belong to different ore-forming processes and exist provenance inheritance relationship. Eu is positive anomaly in lead-zinc deposit ores and low negative anomaly in pyrite deposit ores, reflecting that the acidic hydrothermal is involved in lead-zinc mineralization. ∑REE of Yanshanian granitic intrusive rocks is the highest, that of regional cambrian strata is the next, that of lead-zinc pyrite ores is the lowest, indicating that the migration of REE are triggered by tectonic thermal events and magmatic events in the lead-zinc mineralization. The host strata limestone, early Yanshanian granite and intermediate-basic dike rock-nomalized REE patterns of pyrite which ores all show different degrees of planarization, implies that the multiple sources are concerned with lead-zinc mineralization. REE Q-mode hierarchical cluster analysis on ores and other related geological bodies show that the related substances from ore-bearing carbonate rocks are mainly offered to pyrite metallogenesis, and the ore-forming materials of lead-zinc metallogenesis are mostly provided by basal clastic rocks, only part by early Yanshanian granitic intrusive rocks. Late Yanshanian intermediate-basic intrusive rocks participate in the late stage of lead-zinc mineralization.
Key words: Fankou-type lead-zinc sulfide deposit; RE element; distribution pattern; Q-mode hierarchical cluster analysis; two hydrothermal stages
