文章摘要
颉贵琴,刘龙,火久伟,马涛,李进喜.西藏南木林县阿木雄北花岗闪长岩LA-ICP-MS锆石U-Pb年龄、岩石成因及构造意义[J].矿产勘查,2019,(6):1351-1360
西藏南木林县阿木雄北花岗闪长岩LA-ICP-MS锆石U-Pb年龄、岩石成因及构造意义
LA-ICP-MS Zircon U-Pb Age, Petrogenesis and Tectonic Significance of the Amuxiong North Granodiorite in the Middle Section of the Gangdese belt, Tibet
投稿时间:2019-01-10  
DOI:
中文关键词: LA-ICP-MS锆石  U-Pb定年  岩石地球化学  I型花岗岩  喜山期  冈底斯
英文关键词: LA-ICP-MS zircon,U-Pb dating,rock geochemistry,I type granite,Himalayan period,Gangdese
基金项目:中国调查局成都地质调查中心基础项目《西藏1∶5万打加错东地区4幅区域地质矿产调查》(编号:12120113034400)资助。
作者单位
颉贵琴 甘肃省自然资源信息中心,兰州 730030 
刘龙 甘肃省地矿局第三地质矿产勘查院,兰州 730050 
火久伟 甘肃省地矿局第三地质矿产勘查院,兰州 730050 
马涛 甘肃省地矿局第三地质矿产勘查院,兰州 730050 
李进喜 甘肃省地矿局第三地质矿产勘查院,兰州 730050 
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中文摘要:
      对冈底斯带中段阿木雄北花岗闪长岩进行LA-ICP-MS锆石U-Pb定年,主量和微量元素地球化学分析表明,花岗闪长岩的结晶年龄为61.8±1.2 Ma。花岗闪长岩为高钾钙碱性强过铝质花岗岩,SiO2含量为58.65%~73.5%,A/CNK值介于1.01~1.10之间,A/NK值介于1.34~2.19之间,稀土元素总量(∑REE)在99.96~201.42之间,在稀土元素配分模式图上,表现为倾斜下凹的浅“V”字型,轻、重稀土分馏明显;在微量元素蛛网图上,表现出相对富集Rb、Th、La、Pr、Hf、Nd、Dy,而亏损Ta、Nb、Ce、P、Zr、Ti的特征。花岗闪长岩显示出壳幔混源的特性,母源岩浆来自地幔,而后经AFC过程所形成的分异型I花岗岩,新特提斯洋板片回撤是其形成的深部地球动力学背景。
英文摘要:
      The L LA-ICP-MS zircon U-Pb age, petrogenesis and tectonic significance of the Amuxiong North granodiorite in the middle section of the Gangdese belt, TibetA-ICP-MS zircon U-Pb dating of the Amuxiong North granodiorite in the middle section of the Gangdese belt is carried out. The geochemical analysis of major and trace elements shows that the crystallization age of granodiorite is 61.8. ±1.2 Ma. The granodiorite is a high-potassium-calcium-alkaline-strong aluminous granite with a SiO2 content of 58.65% to 73.5%, an A/CNK value between 1.01 and 1.10, and an A/NK value between 1.34 and 2.19. The total amount of rare earth elements (∑REE) is between 99.96 and 201.42. On the distribution pattern of rare earth elements, it shows a shallow “V” shape with a concave and concave shape, and the light and heavy rare earth fractionation is obvious; on the trace element spider web, It exhibits the characteristics of relatively enriched Rb, Th, La, Pr, Hf, Nd, Dy, and loss of Ta, Nb, Ce, P, Zr, Ti. The granodiorite shows the characteristics of the crust-mantle mixed source. The maternal magma comes from the mantle, and the different type I granite formed by the AFC process, the retreat of the Neo-Tethys ocean plate is the deep geodynamic background.
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