太行山中段石湖金矿区石英闪长玢岩脉LA-ICP-MS锆石U-Pb年龄、地球化学特征及成矿意义  

LA-ICP-MS Zircon U-Pb Age,Geochemical Characteristics and Metallogenic Significance of Quartz Diorite Porphyrite Dykes from the Shihu Gold Deposit in the Middle of Taihang Mountain

作　　者：王银川[1] 李胜荣[2] 闫永杰[1] 侯天江 韩丽娟 李真真[2] Wang Yinchuan;Li Shengrong;Yan Yongjie;Hou Tianjiang;Han Lijuan;Li Zhenzhen(Sixth Geological Brigade of Hebei Bureau of Geology and Mineral,Shijiazhuang 050081,China;China University of Geosciences（Beijing）,Beijing 100083,China)

机构地区：[1]河北省地矿局第六地质大队,石家庄050081 [2]中国地质大学(北京),北京100083

出　　处：《地质科技情报》2018年第5期37-48,共12页Geological Science and Technology Information

基　　金：河北省国土资源厅基金项目"河北省大库联;八道沟;单晶河;尚义县幅1:5万区域地质调查"(4540401YBN8FVU);"河北省阜平-灵寿麻棚岩体外围金银钼矿成矿规律及找矿方向研究"(2012055555);河北省地矿局基金项目"河北省承德地区铀多金属矿选区评价"(4540502YBNOCTF)

摘　　要：石湖金矿大地构造位置上位于华北克拉通太行山中段,与石英闪长玢岩脉存在密切的成因联系。通过对矿区内石英闪长玢岩脉锆石进行激光等离子体质谱LA-ICP-MS单颗粒锆石微区U-Pb同位素测年,获得了年龄为(130.5±1.4)Ma(MSWD=1.8,N=34),时代为早白垩世。该岩石具高硅、富碱、富铝等特征,属钙碱性系列,具有弱的Eu正异常,富集大离子亲石元素K、Cs、Rb等,亏损高场强元素和重稀土元素Nb、Ta、Zr、Hf、Y、Yb等。具有高Sr低Y、Yb的特征,以及较高的Sr/Y、(La/Yb)_N比值,具有类似于加厚下地壳部分熔融形成的埃达克质岩石特征,埃达克质岩石与金矿密切相关。因此,太行山中段埃达克质石英闪长玢岩脉与金矿具有重要成因联系。The Shihu gold deposit is geotectonically located in the middle of Taihang Mountain of North China craton,which is related with the quartz diorite porphyrite dykes.This study acquires the age of quartz diorite porphyrite dykes as（130.5±1.4）Ma（MSWD=1.8,N=34）in the middle of Upper Cretaceous U-Pb isotope dating of the single grain zircon micro area of the zircon in the dykes by means of Laser Ablation Inductively Coupled Plasma Mass Spectrometry.The geochemical data show that the rock has the characteristics of high silicon and is rich in alkalis and aluminum,thus belonging to calc-alkalic series.This deposit is characterized by weak Eu positive anomaly,enrichment of LILE such as K,Cs and Rb,and loss of HFSE and HREE such as Nb,Ta,Zr,Hf,Y and Yb.Similar to adakite,the rock also has the characteristics of high Sr,and low Y and Yb,and higher Sr/Y and（La/Yb）N ratio,which is formed by the partial melting of the thickening of the lower crust.The rock of adakite is closely related with the gold deposit.Therefore,quartz diorite porphyrite dykes with characteristics of adakite located in the middle of Taihang Mountain have more important genetic relationship with the gold deposit.

关 键 词：石湖金矿 石英闪长玢岩脉 埃达克岩 LA-ICP-MS锆石U-PB年龄 

分 类 号：P588.12[天文地球—岩石学] P597[天文地球—地质学]