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浙江印支期铝质A型花岗岩的发现及其地质意义

, PP. 164-177

Keywords: 印支期,年代学,地球化学,A型花岗岩,浙江

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Abstract:

?对浙西南靖居正长花岗岩开展了锆石LA-ICP-MSU-Pb年代学及岩石地球化学研究.锆石年代学研究表明,靖居正长花岗岩的结晶年龄为(215±2)Ma,表明其为一晚三叠世岩体,而非前人所认为的白垩纪岩浆活动产物.靖居正长花岗岩具高的K2O和FeO*含量和低的MgO含量,富集K,Th,La,Ce等大离子亲石元素及轻稀土元素,亏损Nb,Ta,Ti等高场强元素,具高的104Ga/Al比值及(Zr+Nb+Ce+Y)含量,岩石中出现自形的石英和他形的黑云母,具有A型花岗岩的特征.Sr-Nd同位素研究结果显示,岩石具有高的ISr(0.7179~0.7203)、低的εNd(t)(-14.2~-13.2)和较古老的T2DM,与华夏地块古老的基底变质岩系特征一致,指示岩浆来源于华夏基底岩系.研究认为,靖居正长花岗岩是华夏古老的变质基底在伸展的构造背景下部分熔融的产物.靖居印支期A型花岗岩的确定,为华南构造-岩浆演化带来新的时空约束,对理解和构建中国东南乃至华南地区早中生代构造演化具有重要意义.

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