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OALib Journal期刊
ISSN: 2333-9721
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新疆阿尔泰南缘萨尔布拉克铁矿区花岗岩年代学及地球化学研究
, PP. 195-205
Keywords: 花岗岩,锆石SHRIMPU-Pb年龄,地球化学,萨尔布拉克,阿尔泰南缘
Abstract:
本文对新疆阿尔泰南缘萨尔布拉克铁矿区花岗岩体进行了锆石SHRIMPU-Pb年龄测定，获得岩体形成时代为410±4Ma（MSDW=0.88），是晚志留世-早泥盆世岩浆活动产物。岩体的年龄限定它侵入的地层时代大于410Ma，为前泥盆系而不是前人认为的中泥盆统；同时限定萨尔布拉克矽卡岩型铁矿的形成时代略晚于410Ma，为晚志留世末期-早泥盆世早期成矿。萨尔布拉克花岗岩具有富硅、偏碱性，LREE富集且分馏明显，HREE亏损且分馏不明显，中等负铕异常（δEu=0.35～0.47），微量元素Th、U、La、Ce、Nd、Zr、Hf相对富集，Nb、Ta、Sr、P、Ti相对亏损，具明显负异常的特点。Na2O/K2O集中于1附近，属于钙碱性-高钾钙碱性系列。铝过饱和指数变化于1.07-1.14，为过铝质。其微量元素地球化学特征与蒙库岩体（400Ma～404Ma）具有很好的相似性，表明萨尔布拉克花岗岩形成于与板块俯冲有关的活动大陆边缘的陆缘弧环境中，可能是洋壳铁镁质岩石在板块俯冲过程中熔融形成，且加入了陆壳物质。
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