(1. 中南大學(xué)地球科學(xué)與信息物理學(xué)院，長(zhǎng)沙 410083；
2. 江蘇省有色金屬華東地質(zhì)勘查局，南京 210007)
摘 要: 安徽池州馬頭銅鉬多金屬礦床是江南過(guò)渡帶池州段典型斑巖型銅鉬礦床之一。對(duì)礦區(qū)鉆孔中不同深度花崗閃長(zhǎng)(斑)巖和鉀長(zhǎng)花崗巖采用高精度的LA-ICP-MS鋯石U-Pb測(cè)年。結(jié)果表明：花崗閃長(zhǎng)(斑)巖形成相對(duì)較早(144.5~145.8 Ma)，而鉀長(zhǎng)花崗巖侵位稍晚(141.5 Ma)，二者均為燕山晚期(晚侏羅-早白堊世)巖漿作用的產(chǎn)物。對(duì)礦區(qū)13件輝鉬礦樣品采用Re-Os同位素測(cè)年，獲得Re-Os等時(shí)線年齡為(148±3) Ma。考慮到礦體的形成和分布與巖體蝕變關(guān)系較為密切，進(jìn)一步確證安徽池州馬頭銅鉬多金屬礦床成巖與成礦作用為同一構(gòu)造-巖漿熱事件的產(chǎn)物。
關(guān)鍵字: 馬頭銅鉬多金屬礦床；LA-ICP-MS鋯石U-Pb同位素定年；輝鉬礦Re-Os同位素定年；礦化蝕變
（1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
2. East China Mineral Exploration and Development Bureau for Non-Ferrous, Nanjing 210007, China）
Abstract:Matou Cu-Mo polymetallic deposit is one of the typical porphyry Cu-Mo deposits in Chizhou segment of Jiangnan transitional zone, Anhui province. The high precision LA-ICP-MS zircon U-Pb dating is used for granodiorite (porphyry) of mine drill in this area. Zircon LA-ICP-MS U-Pb dating of four drilling samples, yielded ages of 144.5-145.8 Ma for the granodiorite-porphyry, and of 141.5 Ma for the moyite, indicating that they are all the products of the Late-Yanshanian (late-Jurassic to early Cretaceous) magmatism. Meanwhile, Re-Os isotopic age analysis of thirteen molybdenite yielded a weighted average model age of (148±3) Ma. Considered the relationship between the distribution and forming of the ore closely related with the rock alteration, the above information suggests that the diagenesis and the metallogenesis of the Matou Cu-Mo polymetallic deposit are the products of the same tectonic-magamtic thermal events.
Key words: Matou Cu-Mo polymetallic deposit; LA-ICP-MS zircon U-Pb dating; molybdenite Re-Os isotopic dating; mineral alteration
