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地球学报  2010 

新疆吉木乃县恰其海A型花岗岩的地球化学特征、年代学及构造意义

DOI: 10.3975/cagsb.2010.06.04

Keywords: 西准噶尔,A型花岗岩,碱性花岗岩,二叠纪,后碰撞

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Abstract:

新疆西准噶尔北部发育大量碱性花岗岩,其形成时代为早二叠世,岩石类型为钾长花岗岩和石英钾长正长岩。恰其海岩体的形成年龄为280Ma,SiO2为66.83%~68.44%,高铝(14.46%~15.41%);富含碱质,里特曼指数(δ)均大于3.3,介于4.47~4.61之间;富钾贫钠,K2O/Na2O为1.10~1.25;铁高而镁低,FeOt/MgO为4.06~7.85。其稀土配分模式右倾,轻重稀土分馏明显,具有中等-强烈铕负异常。地球化学特征表明:岩石形成于造山晚期伸展体制的构造环境中,应为后碰撞演化的晚期阶段,早于东准噶尔后碰撞的时间(二叠纪末)。构造图解判别岩体为A2型花岗岩,可能受到与俯冲有关的流体交代的影响,为探索区域晚古生代地壳演化提供了约束。

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