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• W2920151359 abstract "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，P2O5与SiO2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eHf（t）值为-1.61~+2.16，二阶段模式年龄tDM2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。" @default.
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• W2920151359 date "2019-01-01" @default.
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• W2920151359 title "Geochemistry, zircon U-Pb geochronology and Hf isotopic characteristics for syenogranite and diorite from the western segment of North Altyn" @default.
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• W2920151359 doi "https://doi.org/10.18654/1000-0569/2019.02.17" @default.
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