(1. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點(diǎn)實(shí)驗(yàn)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. 河南省有色金屬礦產(chǎn)探測工程技術(shù)研究中心，鄭州 450016；
4. 河南省有色金屬地質(zhì)勘查總院，鄭州 450052)
摘 要: 姚沖鉬礦床位于東秦嶺-大別山鉬成礦帶上，礦體產(chǎn)于外接觸帶大別片麻雜巖中。對姚沖鉬礦床成礦巖體的二長花崗巖開展了鋯石Ce4+/Ce3+比值、Ce/Ce*及Eu/Eu*值的研究。結(jié)果表明，二長花崗巖的鋯石Ce4+/Ce3+比值范圍為188~676，平均值為384；鋯石Ce/Ce*值范圍為29.88~254.37，平均值為113.94；鋯石Eu/Eu*值介于0.38~0.66之間，平均值為0.58，反映出與成礦作用有關(guān)的巖漿具有較高的氧逸度。鋯石Ti含量溫度范圍為623.6~762.3 ℃，顯示中酸性巖漿溫度特征。姚沖成礦巖體源于揚(yáng)子板塊拆沉作用，導(dǎo)致軟流圈上涌誘發(fā)加厚時(shí)地殼部分熔融產(chǎn)生的高氧逸度花崗質(zhì)巖漿，高氧逸度巖漿在上升侵位的過程中，受到上部殼源物質(zhì)的混染，巖漿在之后的結(jié)晶分異過程中產(chǎn)生富含Mo的巖漿熱液流體，隨著流體的運(yùn)移，在合適地質(zhì)條件下完成成巖成礦作用。
關(guān)鍵字: 姚沖鉬礦床；二長花崗巖；鋯石；微量元素
（1. Key Laboratory of Nonferrous Metal Ore Forecast, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info physics, Central South University, Changsha 410083, China;
3. Non-Ferrous Mineral Exploration Engineering Research Center of Henan Province, Zhengzhou 450016, China;
4. Henan Institute of Geological Exploration for Non-ferrous Metal, Zhengzhou 450052, China）
Abstract:Yaochong Mo deposit locates at the Qinling-Dabie metallogenic belt, the deposit is hosted by Dabie metamorphic complex at the exocontact zone. The results show that, the values of Ce4+/Ce3+, Ce/Ce* and Eu/Eu* of zircons in monzogranite from Yaochong Mo deposit are from 188 to 676, 29.88 to 254.37, 0.38 to 0.66, and the average values are 384, 113.94 and 0.58, respectively, which suggests that magma has the characteristics of high oxygen fugacity. Ti content temperature of zircons is from 623.6 ℃ to 762.3 ℃, which is temperature characteristics of middle-acidic magma. The ore-forming rock is from the granitic magma with high oxygen fugacity derived from the patial melting of ancient crust triggered by asthenosphere upwelling, and the granitic magma with high oxygen fugacity is contaminated by the earth’s crust material during the process of emplacement, and then the magma produces magmatic hydrothermal fluid with rich Mo, which causes that diagenetic and mineralization came out in the proper geological conditions with the fluid migration.
Key words: Yaochong Mo deposit; monzogranite; zircon; trace element
