新疆贝勒库都克岩体的锆石SHRIMP U-Pb年龄及其地质意义
SHRIMP U-Pb zircon dating of the Beilekuduk pluton in Xinjiang and its geological implications
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摘要: 贝勒库都克正长花岗岩体位于东准噶尔贝勒库都克富碱花岗岩带中,该带由正长花岗岩、钠铁闪石花岗岩、钠闪石花岗岩体组成.通过对贝勒库都克正长花岗岩体锆石SHRIMP U-Pb年龄测定,获得306±5 Ma的206Pb/238U年龄,表明岩体侵位时代为晚石炭世末.结合前人的年龄数据限定了贝勒库都克富碱花岗岩带形成时代为晚石炭世末一早二叠世初(307～290 Ma).岩石地球化学表明,贝勒库都克正长花岗岩具有富硅、碱、REE、Rb、Th、Ce、Nd、Hf元素,贫Ba、Sr、P、Ti、Eu、Nb、Zr元素,富集轻稀土,强负铕异常,(Ga/Al)×104=4～4.1,具有A2型花岗岩特征.贝勒库都克富碱花岗岩的形成是紧随造山运动之后发生,形成于后碰撞阶段的张性构造环境中.
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