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地球学报  2010 

新疆阿尔泰克兰河中游泥盆纪花岗岩锆石LA-ICP-MSU-Pb年龄及地球化学特征

DOI: 10.3975/cagsb.2010.04.04

Keywords: 花岗岩,LA-ICP-MS锆石U-Pb年龄,地球化学,克兰河中游,阿尔泰

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Abstract:

克兰河中游英云闪长岩和二长花岗岩的锆石LA-ICP-MSU-Pb年龄分别为400±2.3Ma(MSDW=1.1)和401±3.3Ma(MSDW=1.2),表明岩体侵位于早泥盆世早期,同时也暗示了岩体围岩康布铁堡组地层的形成时代早于401Ma。所有花岗质岩石具有高的SiO2(67.80%~76.54%)和Al2O3(12.39%~16.07%)含量,低P2O5(0.02%~0.17%)和MgO+FeO(2.22%~5.12%)含量,富碱(K2O+Na2O=5.58%~8.25%),具有低的CaO/Na2O(<0.3)比值和高的A/CNK值(0.96~1.39);富集LREE和Th、U,贫Ba、P、Sr、Ti、Nb,呈现明显的Eu负异常(δEu=0.22~0.73)。以上特征表明该岩体属钙碱性准铝质-过铝质岩类,具有岛弧花岗岩的典型特征。结合阿尔泰南缘的区域地质背景综合分析,推测岩体形成于活动大陆边缘环境,是在俯冲作用过程中由变泥质岩和变质杂砂岩脱水熔融的产物,在部分熔融过程中有磷灰石、斜长石、钛铁矿等矿物的残留。

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