(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；
3. 南京大學(xué) 內(nèi)生金屬礦床成礦機(jī)制研究國(guó)家重點(diǎn)實(shí)驗(yàn)室，南京 210093)
摘 要: 馬頭礦區(qū)復(fù)式花崗巖體發(fā)育于江南過(guò)渡帶池州段，主要由花崗閃長(zhǎng)(斑)巖和鉀長(zhǎng)花崗巖組成，與該地區(qū)銅鉬等多金屬礦化有著密切的聯(lián)系。花崗閃長(zhǎng)(斑)巖表現(xiàn)出類似埃達(dá)克質(zhì)巖的地球化學(xué)特征，富集LILE(尤其是Sr和Ba)和LREE，Eu負(fù)異常不顯著，相對(duì)虧損HREE和Y，被認(rèn)為是富集巖石圈地幔部分熔融的產(chǎn)物，在成巖過(guò)程中也有一定程度的地殼組分混染。鉀長(zhǎng)花崗巖則表現(xiàn)出高硅、高鉀的地球化學(xué)特征，其鋯石飽和溫度(近液相線溫度)接近于低共熔花崗巖，很可能是早期形成巖體在壓力釋放過(guò)程中再次熔融的產(chǎn)物。綜合來(lái)看，在馬頭礦區(qū)，銅鉬(金)等親硫成礦元素的物質(zhì)來(lái)源很可能與花崗閃長(zhǎng)(斑)巖的侵位有關(guān)，但鉀長(zhǎng)花崗巖在鉬的富集和強(qiáng)烈礦化過(guò)程中起到了催化媒介的作用。
關(guān)鍵字: 馬頭銅鉬多金屬礦區(qū)；復(fù)式花崗巖；埃達(dá)克質(zhì)巖；部分熔融
（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;
3. State Key Laboratory for Mineral Deposit Research, Nanjing University, Nanjing 210093, China）
Abstract:Matou compound granites occurr in the Chizhou segment of Jiangnan transitional zone, consist mainly of granodiorite-porphyry and moyite, and are closely related to the Cu-Mo polymetallic mineralization in this area. The granodiorite-porphyry has high LILEs (especially Sr and Ba) and LREEs, and low HREEs and Y contents and insignificant negative Eu anomalies, similar to the adakitic rocks. It is identified that the product is derived from the partial melting of enriched lithospheric mantle, and also contaminates some crustal components in its diagenetic processes. The moyite is characterized by high silica and high potassium, and its zircon saturation temperature is close to that of eutectic granite. It may be the product of the partial melting of the pre-exist granites during the depressurizing. In Matou Cu-Mo polymetallic orefield, the materials source of the sulfur ore-forming elements, such as Cu, Au and Mo, is probably related to that of the emplaced granodiorite-porphyry, and the moyite plays a catalytic role in the molybdenum concentration and intensive mineralization.
Key words: Matou Cu-Mo polymetallic orefield; compound granites; adakitic rock; partial melting
