司博闻, 侯广顺.嵩山地区后河石英闪长岩体形成时代及岩石地球化学特征[J].河南理工大学学报（自然科学版）,2022,41(6):64-76.

SI B W, HOU G S.Formation age and geochemical features of the Houhe quartz diorite pluton in the Songshan Area， southern North China Craton[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):64-76.

嵩山地区后河石英闪长岩体形成时代及岩石地球化学特征

司博闻1, 侯广顺2

1.中国矿业大学（北京） 地球科学与测绘工程学院，北京  100083；2.河南理工大学 资源环境学院，河南 焦作  454000

摘要:华北克拉通南部嵩山地区新太古代岩浆岩类型众多，最近从登封杂岩中新解体出一个石英闪长岩体，研究该石英闪长岩的岩相学、全岩地球化学和锆石U-Pb同位素年龄数据，以制约其侵位年龄、岩石成因和岩浆来源。结果表明：锆石谐和图上交点年龄（2 512±8）Ma代表了后河石英闪长岩体的结晶年龄；地球化学数据显示其富硅和铝，铁、镁、钙和钠质量分数较高，属于准铝质、镁质、高钙碱性系列岩石，与太古代赞岐岩类似。高w（Sr），w（Y）/w（Yb），（w（La）/w（Yb））N，w（Sr）/w（Y）和明显的HREE亏损，反映了石榴石是其岩浆源区的主要残留相。w（Ti）/w（Zr）较高，w（Ta）/w（Yb）和w（Nb）/w（Yb）高于富集型洋脊玄武岩，以及w（Rb）/w（Sr）较低，表明其来源于富集地幔，且有大陆弧或地壳再循环成分的参与。结合上述地球化学特征，认为嵩山地区后河石英闪长岩体是壳幔相互作用产物，形成于岛弧环境。

关键词:嵩山地区;新太古代;石英闪长岩;地球化学特征;锆石U-Pb年龄

doi:10.16186/j.cnki.1673-9787.2020030064

基金项目:国家自然科学基金资助项目（41773024，21507145）；河南省科技攻关重点项目（172102210331）

收稿日期:2020/03/17

修回日期:2020/04/12

出版日期:2022/11/25

Formation age and geochemical features of the Houhe quartz diorite pluton in the Songshan Area， southern North China Craton

SI Bowen1, HOU Guangshun2

1.College of Geoscience and Surveying Engineering， China University of Mining and Technology （Beijing）， Beijing  100083， China；2.Institute of Resource and Environment， Henan Polytechnic University， Jiaozuo  454000， Henan， China

Abstract:There are many types of Neoarchean magmatic rocks in the Songshan Area，southern North China Craton （NCC）.Recently，the Houhe quartz diorite pluton was discovered from the Dengfeng complex in the course of the regional geological survey.The petrological，geochemical，and zircon chronological dataset of the quartz diorite was studied to constrain its intrusion age，petrogenesis，and source.The age of the upper intercept on the zircon concordial diagram was （2512 ± 8） Ma，which was interpreted here as the crystallization age of the Houhe quartz diorite pluton.Geochemical data showed that the pluton was rich in SiO2 and Al2O3，with high contents of FeOT，MgO，CaO，and Na2O.As a result，it belonged to quasi-aluminum，magnesium，and high-calcium-alkaline series rocks，which was similar to the Archean sanukite.High Sr content，high Y/Yb，（La/Yb）N，Sr/Y，and low HREE values indicated that the residual phases in the source area were mainly garnet.The higher Ti/Zr ratios，higher Ta/Yb and Nb/Yb values than those in the E-MORB，and the lower Rb/Sr ratios implied that the pluton was mainly derived from enriched mantle，coupled with components from continental arc or crustal recycling.Collectively，It was cocluded that the Houhe quartz diorite pluton in the Songshan Area was the product of crust-mantle interaction and formed in an island arc environment.

Key words:Songshan Area;Neoarchean;quartz diorite;geochemical feature;zircon U-Pb geochronology

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