CAJ | 학술논문

寿王坟杂岩体为中生代复式岩体，是寿王坟铜矿的容矿围岩，与成矿关系十分密切。本文对杂岩体中石英二长岩进行了岩相学、岩石地球化学、锆石成因矿物学和U-Pb年代学等方面的研究，讨论了岩石成因和源区。年代学结果显示，本区石英二长岩岩浆锆石206Pb/238U加权平均年龄为（133.48±0.53）Ma（MSWD=0.70），时代为早白垩世；岩石地球化学研究表明，本区石英二长岩以低K2O / Na2O（0.74～0.89）、低磷（P2O5=0.09%～0.40%）和较高A/CNK（1.24~1.38）为特征，属亚碱过铝质岩石。稀土元素含量较高（262.14×10-6～279.83×10-6），富集轻稀土，∑LREE/∑HREE=12.12～17.41，配分曲线平缓右倾，Eu和Ce异常不明显（δEu=0.83～1.26，δCe=0.78～0.93），与上地壳稀土元素特征相似，是一种典型的壳源成因类型。综合分析认为，石英二长岩的地球化学特征及岩浆侵位年龄与成矿时代的耦合关系应代表华北东部中生代大规模岩浆演化与成矿作用在研究区的响应。
수왕분잡암체위중생대복식암체，시수왕분동광적용광위암，여성광관계십분밀절。본문대잡암체중석영이장암진행료암상학、암석지구화학、고석성인광물학화U-Pb년대학등방면적연구，토론료암석성인화원구。년대학결과현시，본구석영이장암암장고석206Pb/238U가권평균년령위（133.48±0.53）Ma（MSWD=0.70），시대위조백성세；암석지구화학연구표명，본구석영이장암이저K2O / Na2O（0.74～0.89）、저린（P2O5=0.09%～0.40%）화교고A/CNK（1.24~1.38）위특정，속아감과려질암석。희토원소함량교고（262.14×10-6～279.83×10-6），부집경희토，∑LREE/∑HREE=12.12～17.41，배분곡선평완우경，Eu화Ce이상불명현（δEu=0.83～1.26，δCe=0.78～0.93），여상지각희토원소특정상사，시일충전형적각원성인류형。종합분석인위，석영이장암적지구화학특정급암장침위년령여성광시대적우합관계응대표화북동부중생대대규모암장연화여성광작용재연구구적향응。
The Shouwangfen composite pluton presented the Mesozoic complex massif that was ore surrounding rock,which had close relationship with mineralization.In this study,petrography,lithogeochemistry,zircon genetic mineralogy,U-Pb chronology of uartz monzonite,lithogenesis and source region were all analyzed. Chronology results demonstrated that the206Pb/238U weighted average age of magmatic zircon was(133.48±0.53)Ma (MSWD=0.70),and the era was the Early Cretaceous Epoch in the study area;lithogeochemistry results showed that the quartz monzonite was with the characteristic of low K2O/Na2O(0.74~0.89),low P(P2O5=0.09%~0.40%), higher A/CNK(1.24~1.38)and it belonged to the alkali peraluminous rock.Moreover,rare earth element content is higher(262.14×10-6~279.83×10-6)with enrichment of light rare earth,∑LREE/∑HREE=12.12~17.41,and the partition curve tended to the right gently.The abnormal of Eu and Ce was not obvious(δEu=0.83~1.26,δCe=0.78~0.93),which was similar to the characteristic of rare earth element in upper crust,and it was a kind of typical crust source genetic types.Therefore,after comprehensive analysis,the coupling relationship between mineralogenetic epoch and geochemical characteristics,magmatic emplacement age of quartz monzonite should represent the regional response of large-scale magmatic evolution and mineralization during Mesozoic in the east of north China.