首页|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

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

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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,δ34 S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.
Ore Source,Ore-Forming Age and Geodynamic Setting of Yaoj iagou Molybdenum Deposit in Qingchengzi Ore-Clustered Area, Eastern Liaoning Province
The maj or 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 Yaoj iagou 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 <br> 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.Theδ34 S 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.

LA ICP MS zircon U Pb datingsulfur isotopeore-forming ageore-forming materialYaojiagou molybdenum depositQingchengzi ore field

张朋、杨宏智、李斌、寇林林、杨凤超

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中国地质调查局沈阳地质调查中心/沈阳地质矿产研究所，沈阳 110034

辽宁省丹东青城子矿业有限公司，辽宁 丹东 118107

LA ICP MSU 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

国家自然科学基金青年基金中国地质调查局项目中国地质调查局项目

4150109312120113058700DD20160049

2016

10.13278/j.cnki.jjuese.201606108

吉林大学学报(地球科学版)
吉林大学

吉林大学学报(地球科学版)

CSTPCDCSCD北大核心
影响因子：1.062
ISSN：1671-5888
年,卷(期)：2016.46(6)
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