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地质学报  2009 

山阳色河花岗岩地球化学特征和锆石SHRIMPUPb年代学

, PP. 1657-1666

Keywords: 东秦岭,色河花岗岩和砾石,地球化学特征,锆石SHRIMP定年

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Abstract:

山阳色河二长花岗岩出露于泥盆纪地层中,并与泥盆纪地层呈断层接触关系。花岗岩主要由钾长石、斜长石和石英组成,其SiO??2?含量介于71%~77%之间、高碱(K??2?O+Na??2?O=7.43%~8.50%),低CaO(0.25%~2.81%),为高钾钙碱性花岗岩,A/CNK的平均值为<1.05,属弱过铝质岩石;较强的轻、重稀土元素分馏程度\[(La/Yb)??N?=4.23\],明显的Eu负异常(δEu=0.511),富集Rb、Th、K、La和Cs等大离子亲石元素,亏损Ba、Nb、Sr、P和Ti元素为特征,属后碰撞花岗岩类。在泥盆纪地层中的花岗岩砾石的岩石地球化学与色河二长花岗岩具有形似性质,高精度的锆石SHRIMPⅡUPb定年获得花岗岩与花岗岩砾石形成时代相一致,分别为709±5Ma和700±11Ma。山阳后碰撞花岗岩的发现,标志着新元古代在东秦岭地区表现为造山后伸展拉张阶段,从而为东秦岭造山带从元古代到古生代的构造体制转换提供证据。

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