Petrogenesis and Geological Significance of the Late Ordovician Adakitic Rock in the Eastern Segment of Tiekelike,Southern Margin of Tarim Basin,Xinjiang
新疆塔里木南缘铁克里克东段晚奥陶世埃达克质岩的成因及地质意义
作者: Guo RuiqingLiu GuipingHu XueyuanLiang WenboCui TaoGeological and Mining Engineering College,Xinjiang UniversityCollege of Resource and Earth Sciences,China University of Mining and Technology
刊名: Geological Science and Technology Information, 2018(06), pp.1-10
中文刊名: 地质科技情报, 2018(06), pp.1-10
来源数据库: CJFDTEMP_U
关键词: TiekelikegranodioriteC-type adakiteLate Ordovicianactive continental margin
中文关键词: 铁克里克花岗闪长岩C型埃达克岩晚奥陶世活动大陆边缘
英文摘要: In order to determine the formation time of the eastern section of the Tiekelike granodiorite and explore the genesis of the rocks in the southern margin of Tarim Basin,this paper studies the geochemistry,zircon U-Pb chronology and Hf isotope.LA-ICP-MS zircon U-Pb geochronology result indicates that the rocks formed in Late Ordovician(444 Ma).The granodiorites are geochemically similar to adakites,with high Sr and Sr/Y and(La/Yb)Nvalues,low Y and Yb contents,and limited ranges for 176 Hf/177 Hf=0.282 397-0.282 497,εHf(t)=-3.7-+0.1,rich in mafic microgranular enclaves and high Mg#,indicating the strong mark of mantle-derived magma.These rich Na,K C-type adakites were most likely derived from the partial melting of mantle.The derived material was added to the basaltic rocks under the...
中文摘要: 为厘定塔里木南缘铁克里克东段花岗闪长岩形成时代并探讨岩石成因,开展了地球化学、锆石U-Pb年代学及Hf同位素研究。LA-ICP-MS锆石U-Pb年代学的结果显示其形成于晚奥陶世(444Ma)。地球化学数据表明其具有类似于C型埃达克岩的高Sr及Sr/Y和(La/Yb)N,低Y和Yb地球化学特征,176 Hf/177 Hf和εHf(t)分别介于0.282 397~0.282 497和-3.7~+0.1之间,富含暗色微粒包体以及高Mg#,指示其具有一定的幔源岩浆印记,可能是玄武质下地壳部分熔融过程中加入一定程度幔源物质,在角闪岩-榴辉岩相条件下部分熔融形成具壳-幔混源特征的富钠、钾C型埃达克岩。结合区域地质资料认为,铁克里克岩体形成于活动大陆边缘环境,北昆仑洋于晚奥陶世仍处于俯冲环境。
全文获取路径:
分享到:

×
关键词翻译
关键词翻译