(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: 曲仁中生代斷陷盆地北緣地區(qū)出露上古生界碳酸鹽巖建造，其內(nèi)已發(fā)現(xiàn)超大型凡口鉛鋅礦床，并在凡口礦區(qū)西側(cè)見楊柳塘、紅珠沖等鉛鋅礦床、西崗寨、羅村黃鐵礦礦床等，東側(cè)見鐵屎嶺等鐵礦點(diǎn)。通過綜合分析研究區(qū)硫化物礦床地質(zhì)礦化特征、區(qū)域水文地球化學(xué)環(huán)境和成礦流體驅(qū)動(dòng)、傳輸和匯聚機(jī)制，融合遞進(jìn)成礦論與成礦系統(tǒng)論思想，認(rèn)為研究區(qū)自元古宙主要經(jīng)歷了三大構(gòu)造演化階段及多種構(gòu)造體制的轉(zhuǎn)化，導(dǎo)致了多期構(gòu)造熱事件和巖漿侵入活動(dòng)發(fā)生，為盆地北緣金屬元素的大規(guī)模富集成礦創(chuàng)造了條件。按成礦時(shí)間先后將凡口式鉛鋅硫化物成礦劃分為兩個(gè)成礦系統(tǒng)，即印支期包括壓縮驅(qū)動(dòng)、近東西向褶皺、層間滑動(dòng)構(gòu)造、沉積成巖期黃鐵礦和地層硫儲(chǔ)體、碳酸鹽巖含水層等關(guān)鍵控礦因素的黃鐵礦熱液成礦系統(tǒng)；燕山早期包括熱膨脹驅(qū)動(dòng)、NE、NW向斷裂構(gòu)造、基底碎屑巖含水層、殼源重熔型花崗質(zhì)巖漿、古地?zé)岙惓５汝P(guān)鍵控礦因素的鉛鋅熱液成礦系統(tǒng)。凡口式鉛鋅硫化物礦床是這兩個(gè)成礦系統(tǒng)在時(shí)間和空間上的繼承、疊加和改造的結(jié)果。
關(guān)鍵字: 曲仁盆地北緣；鉛鋅硫化物礦床；關(guān)鍵控礦因素；成礦系統(tǒng)
（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）
Abstract:The northern margin of Quren Mesozoic faulted basin outcrops Paleozoic carbonate formation, in which Fankou large lead-zinc deposit was discovered. Meanwhile, Yangliutang, Hongzhucong lead-zinc deposits and Xigangzai, Luocun pyrite deposits were discovered in the westward of Fankou mine, and Tieshiling iron points were discovered in the eastward of Fankou mine. Through comprehensively analyzing the geological and mineralization characteristics of these sulphide deposits in this area, the regional hydrogeochemical environment, forming fluid driving, transmission and aggregation mechanism, by fusing progressive mineralization and metallogenic system theory, the study suggests that this research area had mainly undergone three large tectonic evolution stages since Proterozoic and the conversion of a variety of tectonic regime. All those resulted in the multi-period structure thermal events and magma intrusion activities, and created the conditions of the metal elements enrichment and mineralization in large scale. Fankou-type lead-zinc sulfide mineralization in this area can be chronologically divided into two metallogenic systems, one of which is Indosinian pyrite hydrothermal mineralization system controlled by key factors of compression driver, the EW fold, interlayer sliding structure, sedimentary diagenetic pyrite and sulfur storage body in carbonate Aquifer. The other one is Early Yanshanian lead-zinc sulfide hydrothermal mineralization system controlled by key factors of thermal expansion driver, NE, NW faults, clastic basement aquifer, crust remelting type granitic magmatism and ancient geothermal anomaly. Fankou-type lead-zinc sulfide deposit is formed because of inheritance, superimposition and alteration of combined the two metallogenic systems.
Key words: northern margin of Quren basin; lead-zinc sulfide deposit; key ore-controlling factors; metallogenic system
