辽东青城子矿集区姚家沟钼矿床成矿物质来源、成矿年代及成矿动力学背景

doi:10.13278/j.cnki.jjuese.201606108

摘要/Abstract

摘要： 本文对辽东青城子矿集区姚家沟钼矿床与成矿密切的姚家沟花岗岩进行了元素地球化学、锆石LA-ICP-MS U-Pb定年和矿床金属硫化物硫同位素系统分析。结果表明：姚家沟花岗岩侵入时代为（167.47±0.87）Ma，具有富硅、富铝、全碱含量中等、过铝质强过铝质的特征；稀土配分模式呈现轻稀土富集、重稀土亏损的右倾型，Eu弱正异常；富集K、Rb、U、Sr、Pb等大离子亲石元素，亏损Nb、Ti、P等高场强元素，δ³⁴S值为2.0‰~3.9‰，平均值为2.7‰。结合姚家沟矿床辉钼矿Re-Os同位素研究成果进一步得出，姚家沟岩体至少为两期岩浆活动的产物，辉钼矿成矿与本次获得的（167.47±0.87）Ma岩浆活动有关，二者成岩、成矿时代一致。硫同位素指示成矿物质来源于岩浆。姚家沟钼矿成岩、成矿构造背景为受古亚洲洋闭合影响，华北板块与西伯利亚板块后碰撞造山阶段构造-岩浆-流体活动的环境。

关键词: LA-ICP-MS U-Pb锆石定年, S同位素, 成矿时代, 成矿物质, 姚家沟钼矿, 青城子矿集区

Abstract: The major element, rare earth element (REE), trace element, LA-ICP-MS zircon U-Pb dating of the Yaojiagou granite and sulfur isotope of metal sulfides associated with molybdenum mineralizaion were analyzed. The results show that the Yaojiagou granite intrusion was emplaced at (167.47±0.87) Ma, indicating that it was formed in Middle Jurassic. Geochemically, the granite are rich in silicon and aluminum, with middling alkali content and peraluminous-strongly. The Yaojiagou granite are characterized by enrichment of light rare earth element contents, and depletion of heavy rare earth elements, with weak positive anomalies of Eu, as well as LILE (such as K, Rb, U, Sr, Pb) enrichment and HFSE (including Nb, Ti, P) depletion. The δ³⁴S values of metal sulfides in Yaojiagou molybdenum deposit vary from 2.0‰ to 3.9‰ (2.7‰ on average). Combination with existing geochronologic date of Yaojiagou granite and Re-Os dating of molybdenite, we assume that there were twist age of intrusions in Yaojiagou granite and Yaojiagou molybdenum deposit was related to the magma activities at (167.47±0.87) Ma. The sulfur isotope indicated that the ore-forming materials are derived from hypomagma. In combination with metallogenic geological background and geochemistry of Yaojiagou granite, we inferred that the Yaojiagou molybdenum deposit and associated granite developed from Early to Middle Jurassic, and influenced by magma and fluid function of post-collision between North China craton and Siberia craton.

Key words: LA-ICP-MS zircon U-Pb dating, sulfur isotope, ore-forming age, ore-forming material, Yaojiagou molybdenum deposit, Qingchengzi ore field

中图分类号:

P618.65

张朋, 杨宏智, 李斌, 寇林林, 杨凤超. 辽东青城子矿集区姚家沟钼矿床成矿物质来源、成矿年代及成矿动力学背景[J]. 吉林大学学报(地球科学版), 2016, 46(6): 1684-1696.

Zhang Peng, Yang Hongzhi, Li Bin, Kou Linlin, Yang Fengchao. Ore Source, Ore-Forming Age and Geodynamic Setting of Yaojiagou Molybdenum Deposit in Qingchengzi Ore-Clustered Area, Eastern Liaoning Province[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(6): 1684-1696.

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