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北阿尔金西段正长花岗岩和闪长岩地球化学、锆石U-Pb定年及Hf同位素特征
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  • 英文篇名:Geochemistry,zircon U-Pb geochronology and Hf isotopic characteristics for syenogranite and diorite from the western segment of North Altyn
  • 作者:郑坤 ; 吴才来 ; 魏春景 ; 郜源红 ; 郭文峰 ; 陈红杰 ; 吴迪 ; 高栋
  • 英文作者:ZHENG Kun;WU CaiLai;WEI ChunJing;GAO YuanHong;GUO WenFeng;CHEN HongJie;WU Di;GAO Dong;Institute of Geology,Chinese Academy of Geological Sciences;School of Earth and Space Sciences,Peking University;Institute of Geomechanics,Chinese Academy of Geological Sciences;
  • 关键词:正长花岗岩 ; 地球化学 ; 锆石U-Pb定年 ; Hf同位素 ; 北阿尔金
  • 英文关键词:Syenogranite;;Geochemistry;;U-Pb chronology;;Hf isotopic characteristics;;North Altyn
  • 中文刊名:YSXB
  • 英文刊名:Acta Petrologica Sinica
  • 机构:中国地质科学院地质研究所;北京大学地球与空间科学学院;中国地质科学院地质力学研究所;
  • 出版日期:2019-02-15
  • 出版单位:岩石学报
  • 年:2019
  • 期:v.35
  • 基金:国家自然科学基金项目(41872071、40672049);; 中国地质调查局项目(121201102000150005)联合资助
  • 语种:中文;
  • 页:YSXB201902017
  • 页数:17
  • CN:02
  • ISSN:11-1922/P
  • 分类号:269-285
摘要
北阿尔金西段出露大量中酸性侵入岩,为探讨西段地区花岗质岩石的成因、形成环境以及北阿尔金地区岩浆活动特点,本文选取北阿尔金西段的正长花岗岩体和闪长岩体作为研究对象,进行了岩石学、地球化学、锆石U-Pb年代学及Hf同位素等方面的研究。研究结果表明,正长花岗岩体形成时代为495.7~502.0Ma,铝饱和指数A/CNK为0.86~1.09小于1.1,P_2O_5与SiO_2含量呈负相关,具I型花岗岩特征。轻稀土富集而重稀土亏损,具有明显的负Eu异常,微量元素特征显示富集Rb、Ba、Th、U、K等元素,相对亏损Nb、Ta、P、Ti等元素。岩石地球化学及锆石Hf同位素特征暗示其源区物质成分不均一,源岩主要为0.95~1.4Ga的新生地壳(变中基性岩),并有1.42~1.83Ga的古老地壳物质的参与。闪长岩体的侵位时代为497.1±3Ma,轻稀土富集而重稀土亏损,较弱的负Eu异常,相对富集Rb、Ba、Th、U、K等元素,而亏损Nb、Ta、P、Ti。锆石ε_(Hf)(t)值为-1.61~+2.16,二阶段模式年龄t_(DM2)为1.34~1.56Ga,暗示其源岩可能主要为新生地壳,并有古老地壳物质参与成岩。北阿尔金西段正长花岗岩、闪长岩均形成于早古生代,具弧型花岗岩特点,结合区域构造背景,认为其形成可能与北阿尔金洋壳俯冲有关,产于陆弧环境。
        Abundant intermediate-acid intrusions were widely outcropped in the western segment of North Altyn.In order to investigate the petrogenesis and formation environment of the granitoids in the western segment,and the features of magmatic activity,the syenogranite and diorite from the western segment of North Altyn were chosen to study by means of petrology,geochemistry,zircon U-Pb chronology and Hf isotope.The results show that the zircon U-Pb ages for the syenogranite are 495.7~502.0Ma.These rocks show signatures of I-type granite,with aluminum saturation index(A/CNK=0.86~1.09)less than 1.1 and a negative correlation between P_2O_5and SiO_2.The syenogranite samples show steep REE patterns,with LREE enrichment relative to HREE,and pronounced negative Eu.They also show characteristic distribution,with pronounced enrichments in Rb,Ba,Th,U,K and depletions of Nb,Ta,P,Ti.Geochemistry and zircon Hf isotopic characteristics suggest that the composition of the source is heterogeneous.The source rocks of the syenogranite were mainly intermediate-basic metaigneous rocks of the juvenile crust(0.95~1.4Ga),and minor ancient crust(1.42~1.83Ga).The diorite was emplaced in 497.1±3Ma,with LREE enrichment relative to HREE,slightly negative Eu,enrichments in Rb,Ba,Th,U,K and depletions of Nb,Ta,P,Ti.The zirconε_(Hf)(t)values of the diorite rang from-1.61~+2.16.The two-stage model age(t_(DM2))are varied in 1.34~1.56Ga.These characteristics indicate that the source rocks probablely derived from the juvenile crust and a small amount of ancient crust.The syenogranite and diorite were formed in the Early Paleozoic.They have the characteristics of the arc granites.In combination with the regional tectonic setting,these rocks were probablely formed in continental arc setting related to the subduction of oceanic crust.
引文
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    (1)新疆维吾尔自治区地质局.1982.1∶20万巴什考供幅地质图

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